compiler.h: take in recent linux updates for newer gcc support
Had to remove from original compiler-gcc: - things that deal with types, e.g. READ_ONCE macro and friends; - #define barrier(). This one would be better there at some point.
This commit is contained in:
Dominique Martinet
committed by
Balazs Gerofi
Balazs Gerofi
parent
230272438f
commit
2a46fd0b2d
@ -1,36 +1,343 @@
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/* Never include this file directly. Include <lwk/compiler.h> instead. */
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#ifndef __LWK_COMPILER_H
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#error "Please don't include <linux/compiler-gcc.h> directly, include <lwk/compiler.h> instead."
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#endif
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/*
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* Common definitions for all gcc versions go here.
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*/
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#define GCC_VERSION (__GNUC__ * 10000 \
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+ __GNUC_MINOR__ * 100 \
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+ __GNUC_PATCHLEVEL__)
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/* Optimization barrier */
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/* The "volatile" is due to gcc bugs
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* NOTE: already defined in ihk/manycore/generic/include/ihk/cpu.h
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/* The "volatile" is due to gcc bugs */
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/* XXX: barrier is also defined in lib/include/ihk/cpu.h,
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* it would be cleaner to restore this here at some point, but we have
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* quite a few C files not including either this or kernel's compiler.h
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* #define barrier() __asm__ __volatile__("": : :"memory")
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*/
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/* This macro obfuscates arithmetic on a variable address so that gcc
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shouldn't recognize the original var, and make assumptions about it */
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/*
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* This version is i.e. to prevent dead stores elimination on @ptr
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* where gcc and llvm may behave differently when otherwise using
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* normal barrier(): while gcc behavior gets along with a normal
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* barrier(), llvm needs an explicit input variable to be assumed
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* clobbered. The issue is as follows: while the inline asm might
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* access any memory it wants, the compiler could have fit all of
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* @ptr into memory registers instead, and since @ptr never escaped
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* from that, it proved that the inline asm wasn't touching any of
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* it. This version works well with both compilers, i.e. we're telling
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* the compiler that the inline asm absolutely may see the contents
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* of @ptr. See also: https://llvm.org/bugs/show_bug.cgi?id=15495
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*/
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#define barrier_data(ptr) __asm__ __volatile__("": :"r"(ptr) :"memory")
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/*
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* This macro obfuscates arithmetic on a variable address so that gcc
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* shouldn't recognize the original var, and make assumptions about it.
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*
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* This is needed because the C standard makes it undefined to do
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* pointer arithmetic on "objects" outside their boundaries and the
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* gcc optimizers assume this is the case. In particular they
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* assume such arithmetic does not wrap.
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*
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* A miscompilation has been observed because of this on PPC.
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* To work around it we hide the relationship of the pointer and the object
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* using this macro.
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*
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* Versions of the ppc64 compiler before 4.1 had a bug where use of
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* RELOC_HIDE could trash r30. The bug can be worked around by changing
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* the inline assembly constraint from =g to =r, in this particular
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* case either is valid.
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*/
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#define RELOC_HIDE(ptr, off) \
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({ unsigned long __ptr; \
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({ \
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unsigned long __ptr; \
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__asm__ ("" : "=r"(__ptr) : "0"(ptr)); \
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(typeof(ptr)) (__ptr + (off)); })
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(typeof(ptr)) (__ptr + (off)); \
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})
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/* Make the optimizer believe the variable can be manipulated arbitrarily. */
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#define OPTIMIZER_HIDE_VAR(var) \
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__asm__ ("" : "=r" (var) : "0" (var))
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#define inline inline __attribute__((always_inline))
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#define __inline__ __inline__ __attribute__((always_inline))
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#define __inline __inline __attribute__((always_inline))
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#define __deprecated __attribute__((deprecated))
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#ifdef __CHECKER__
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#define __must_be_array(a) 0
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#else
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/* &a[0] degrades to a pointer: a different type from an array */
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#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
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#endif
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/*
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* Force always-inline if the user requests it so via the .config,
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* or if gcc is too old.
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* GCC does not warn about unused static inline functions for
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* -Wunused-function. This turns out to avoid the need for complex #ifdef
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* directives. Suppress the warning in clang as well by using "unused"
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* function attribute, which is redundant but not harmful for gcc.
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*/
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#if !defined(CONFIG_ARCH_SUPPORTS_OPTIMIZED_INLINING) || \
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!defined(CONFIG_OPTIMIZE_INLINING) || (__GNUC__ < 4)
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#define inline inline __attribute__((always_inline,unused)) notrace
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#define __inline__ __inline__ __attribute__((always_inline,unused)) notrace
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#define __inline __inline __attribute__((always_inline,unused)) notrace
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#else
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/* A lot of inline functions can cause havoc with function tracing */
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#define inline inline __attribute__((unused)) notrace
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#define __inline__ __inline__ __attribute__((unused)) notrace
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#define __inline __inline __attribute__((unused)) notrace
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#endif
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#define __always_inline inline __attribute__((always_inline))
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#define noinline __attribute__((noinline))
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#define __attribute_pure__ __attribute__((pure))
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#define __attribute_const__ __attribute__((__const__))
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#define __deprecated __attribute__((deprecated))
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#define __packed __attribute__((packed))
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#define __weak __attribute__((weak))
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#define __alias(symbol) __attribute__((alias(#symbol)))
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/*
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* it doesn't make sense on ARM (currently the only user of __naked)
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* to trace naked functions because then mcount is called without
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* stack and frame pointer being set up and there is no chance to
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* restore the lr register to the value before mcount was called.
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*
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* The asm() bodies of naked functions often depend on standard calling
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* conventions, therefore they must be noinline and noclone.
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*
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* GCC 4.[56] currently fail to enforce this, so we must do so ourselves.
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* See GCC PR44290.
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*/
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#define __naked __attribute__((naked)) noinline __noclone notrace
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#define __noreturn __attribute__((noreturn))
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/*
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* From the GCC manual:
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*
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* Many functions have no effects except the return value and their
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* return value depends only on the parameters and/or global
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* variables. Such a function can be subject to common subexpression
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* elimination and loop optimization just as an arithmetic operator
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* would be.
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* [...]
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*/
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#define __pure __attribute__((pure))
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#define __aligned(x) __attribute__((aligned(x)))
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#define __aligned_largest __attribute__((aligned))
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#define __printf(a, b) __attribute__((format(printf, a, b)))
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#define __scanf(a, b) __attribute__((format(scanf, a, b)))
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#define __attribute_const__ __attribute__((__const__))
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#define __maybe_unused __attribute__((unused))
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#define __always_unused __attribute__((unused))
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#define __mode(x) __attribute__((mode(x)))
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/* gcc version specific checks */
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#if GCC_VERSION < 30200
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# error Sorry, your compiler is too old - please upgrade it.
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#endif
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#if GCC_VERSION < 30300
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# define __used __attribute__((__unused__))
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#else
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# define __used __attribute__((__used__))
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#endif
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#ifdef CONFIG_GCOV_KERNEL
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# if GCC_VERSION < 30400
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# error "GCOV profiling support for gcc versions below 3.4 not included"
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# endif /* __GNUC_MINOR__ */
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#endif /* CONFIG_GCOV_KERNEL */
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#if GCC_VERSION >= 30400
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#define __must_check __attribute__((warn_unused_result))
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#define __malloc __attribute__((__malloc__))
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#endif
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#if GCC_VERSION >= 40000
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/* GCC 4.1.[01] miscompiles __weak */
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#ifdef __KERNEL__
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# if GCC_VERSION >= 40100 && GCC_VERSION <= 40101
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# error Your version of gcc miscompiles the __weak directive
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# endif
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#endif
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#define __used __attribute__((__used__))
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#define __compiler_offsetof(a, b) \
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__builtin_offsetof(a, b)
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#if GCC_VERSION >= 40100
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# define __compiletime_object_size(obj) __builtin_object_size(obj, 0)
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#endif
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#if GCC_VERSION >= 40300
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/* Mark functions as cold. gcc will assume any path leading to a call
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* to them will be unlikely. This means a lot of manual unlikely()s
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* are unnecessary now for any paths leading to the usual suspects
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* like BUG(), printk(), panic() etc. [but let's keep them for now for
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* older compilers]
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*
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* Early snapshots of gcc 4.3 don't support this and we can't detect this
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* in the preprocessor, but we can live with this because they're unreleased.
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* Maketime probing would be overkill here.
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*
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* gcc also has a __attribute__((__hot__)) to move hot functions into
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* a special section, but I don't see any sense in this right now in
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* the kernel context
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*/
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#define __cold __attribute__((__cold__))
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#define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __COUNTER__)
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#ifndef __CHECKER__
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# define __compiletime_warning(message) __attribute__((warning(message)))
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# define __compiletime_error(message) __attribute__((error(message)))
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#endif /* __CHECKER__ */
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#endif /* GCC_VERSION >= 40300 */
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#if GCC_VERSION >= 40500
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#ifndef __CHECKER__
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#ifdef LATENT_ENTROPY_PLUGIN
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#define __latent_entropy __attribute__((latent_entropy))
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#endif
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#endif
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#ifdef CONFIG_STACK_VALIDATION
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#define annotate_unreachable() ({ \
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asm("%c0:\t\n" \
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".pushsection .discard.unreachable\t\n" \
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".long %c0b - .\t\n" \
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".popsection\t\n" : : "i" (__LINE__)); \
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})
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#else
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#define annotate_unreachable()
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#endif
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/*
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* Mark a position in code as unreachable. This can be used to
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* suppress control flow warnings after asm blocks that transfer
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* control elsewhere.
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*
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* Early snapshots of gcc 4.5 don't support this and we can't detect
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* this in the preprocessor, but we can live with this because they're
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* unreleased. Really, we need to have autoconf for the kernel.
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*/
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#define unreachable() \
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do { annotate_unreachable(); __builtin_unreachable(); } while (0)
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/* Mark a function definition as prohibited from being cloned. */
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#define __noclone __attribute__((__noclone__, __optimize__("no-tracer")))
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#ifdef RANDSTRUCT_PLUGIN
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#define __randomize_layout __attribute__((randomize_layout))
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#define __no_randomize_layout __attribute__((no_randomize_layout))
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#endif
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#endif /* GCC_VERSION >= 40500 */
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#if GCC_VERSION >= 40600
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/*
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* When used with Link Time Optimization, gcc can optimize away C functions or
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* variables which are referenced only from assembly code. __visible tells the
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* optimizer that something else uses this function or variable, thus preventing
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* this.
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*/
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#define __visible __attribute__((externally_visible))
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/*
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* RANDSTRUCT_PLUGIN wants to use an anonymous struct, but it is only
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* possible since GCC 4.6. To provide as much build testing coverage
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* as possible, this is used for all GCC 4.6+ builds, and not just on
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* RANDSTRUCT_PLUGIN builds.
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*/
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#define randomized_struct_fields_start struct {
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#define randomized_struct_fields_end } __randomize_layout;
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#endif /* GCC_VERSION >= 40600 */
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#if GCC_VERSION >= 40900 && !defined(__CHECKER__)
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/*
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* __assume_aligned(n, k): Tell the optimizer that the returned
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* pointer can be assumed to be k modulo n. The second argument is
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* optional (default 0), so we use a variadic macro to make the
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* shorthand.
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*
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* Beware: Do not apply this to functions which may return
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* ERR_PTRs. Also, it is probably unwise to apply it to functions
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* returning extra information in the low bits (but in that case the
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* compiler should see some alignment anyway, when the return value is
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* massaged by 'flags = ptr & 3; ptr &= ~3;').
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*/
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#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
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#endif
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/*
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* GCC 'asm goto' miscompiles certain code sequences:
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*
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* http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58670
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*
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* Work it around via a compiler barrier quirk suggested by Jakub Jelinek.
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*
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* (asm goto is automatically volatile - the naming reflects this.)
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*/
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#define asm_volatile_goto(x...) do { asm goto(x); asm (""); } while (0)
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/*
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* sparse (__CHECKER__) pretends to be gcc, but can't do constant
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* folding in __builtin_bswap*() (yet), so don't set these for it.
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*/
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#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__)
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#if GCC_VERSION >= 40400
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#define __HAVE_BUILTIN_BSWAP32__
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#define __HAVE_BUILTIN_BSWAP64__
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#endif
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#if GCC_VERSION >= 40800
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#define __HAVE_BUILTIN_BSWAP16__
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#endif
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#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */
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#if GCC_VERSION >= 70000
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#define KASAN_ABI_VERSION 5
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#elif GCC_VERSION >= 50000
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#define KASAN_ABI_VERSION 4
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#elif GCC_VERSION >= 40902
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#define KASAN_ABI_VERSION 3
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#endif
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#if GCC_VERSION >= 40902
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/*
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* Tell the compiler that address safety instrumentation (KASAN)
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* should not be applied to that function.
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* Conflicts with inlining: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67368
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*/
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#define __no_sanitize_address __attribute__((no_sanitize_address))
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#endif
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#if GCC_VERSION >= 50100
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/*
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* Mark structures as requiring designated initializers.
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* https://gcc.gnu.org/onlinedocs/gcc/Designated-Inits.html
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*/
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#define __designated_init __attribute__((designated_init))
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#endif
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#endif /* gcc version >= 40000 specific checks */
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#if !defined(__noclone)
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#define __noclone /* not needed */
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#endif
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#if !defined(__no_sanitize_address)
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#define __no_sanitize_address
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#endif
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/*
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* A trick to suppress uninitialized variable warning without generating any
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* code
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*/
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#define uninitialized_var(x) x = x
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@ -1,24 +0,0 @@
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/* Never include this file directly. Include <lwk/compiler.h> instead. */
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/* These definitions are for GCC v4.x. */
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#include <lwk/compiler-gcc.h>
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#ifdef CONFIG_FORCED_INLINING
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# undef inline
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# undef __inline__
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# undef __inline
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# define inline inline __attribute__((always_inline))
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# define __inline__ __inline__ __attribute__((always_inline))
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# define __inline __inline __attribute__((always_inline))
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#endif
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#define __used __attribute__((__used__))
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#define __must_check __attribute__((warn_unused_result))
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#define __compiler_offsetof(a,b) __builtin_offsetof(a,b)
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#define __always_inline inline __attribute__((always_inline))
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/*
|
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* A trick to suppress uninitialized variable warning without generating any
|
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* code
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*/
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#define uninitialized_var(x) x = x
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@ -1,25 +1,33 @@
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#ifndef _LWK_COMPILER_H
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#define _LWK_COMPILER_H
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#ifndef __LWK_COMPILER_H
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#define __LWK_COMPILER_H
|
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|
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#ifndef __ASSEMBLY__
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|
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#ifdef __CHECKER__
|
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# define __user __attribute__((noderef, address_space(1)))
|
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# define __kernel /* default address space */
|
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# define __kernel __attribute__((address_space(0)))
|
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# define __safe __attribute__((safe))
|
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# define __force __attribute__((force))
|
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# define __nocast __attribute__((nocast))
|
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# define __iomem __attribute__((noderef, address_space(2)))
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# define __acquires(x) __attribute__((context(0,1)))
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# define __releases(x) __attribute__((context(1,0)))
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# define __acquire(x) __context__(1)
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# define __release(x) __context__(-1)
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# define __cond_lock(x) ((x) ? ({ __context__(1); 1; }) : 0)
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# define __unused(x) x __attribute__((unused))
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extern void __chk_user_ptr(void __user *);
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extern void __chk_io_ptr(void __iomem *);
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# define __must_hold(x) __attribute__((context(x,1,1)))
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# define __acquires(x) __attribute__((context(x,0,1)))
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# define __releases(x) __attribute__((context(x,1,0)))
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# define __acquire(x) __context__(x,1)
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# define __release(x) __context__(x,-1)
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# define __cond_lock(x,c) ((c) ? ({ __acquire(x); 1; }) : 0)
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# define __percpu __attribute__((noderef, address_space(3)))
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# define __rcu __attribute__((noderef, address_space(4)))
|
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# define __private __attribute__((noderef))
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extern void __chk_user_ptr(const volatile void __user *);
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extern void __chk_io_ptr(const volatile void __iomem *);
|
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# define ACCESS_PRIVATE(p, member) (*((typeof((p)->member) __force *) &(p)->member))
|
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#else /* __CHECKER__ */
|
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# ifdef STRUCTLEAK_PLUGIN
|
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# define __user __attribute__((user))
|
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# else
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# define __user
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# endif
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# define __kernel
|
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# define __safe
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# define __force
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@ -28,35 +36,47 @@ extern void __chk_io_ptr(void __iomem *);
|
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# define __chk_user_ptr(x) (void)0
|
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# define __chk_io_ptr(x) (void)0
|
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# define __builtin_warning(x, y...) (1)
|
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# define __must_hold(x)
|
||||
# define __acquires(x)
|
||||
# define __releases(x)
|
||||
# define __acquire(x) (void)0
|
||||
# define __release(x) (void)0
|
||||
# define __cond_lock(x) (x)
|
||||
# define __unused(x) x
|
||||
#endif
|
||||
# define __cond_lock(x,c) (c)
|
||||
# define __percpu
|
||||
# define __rcu
|
||||
# define __private
|
||||
# define ACCESS_PRIVATE(p, member) ((p)->member)
|
||||
#endif /* __CHECKER__ */
|
||||
|
||||
/* Indirect macros required for expanded argument pasting, eg. __LINE__. */
|
||||
#define ___PASTE(a,b) a##b
|
||||
#define __PASTE(a,b) ___PASTE(a,b)
|
||||
|
||||
#ifdef __KERNEL__
|
||||
|
||||
#ifdef POSTK_DEBUG_ARCH_DEP_72
|
||||
#if __GNUC__ > 5
|
||||
#error no compiler-gcc.h file for this gcc version
|
||||
#elif __GNUC__ == 5
|
||||
# include <lwk/compiler-gcc4.h>
|
||||
#elif __GNUC__ == 4
|
||||
# include <lwk/compiler-gcc4.h>
|
||||
#else
|
||||
# error Sorry, your compiler is too old/not recognized.
|
||||
#ifdef __GNUC__
|
||||
#include <lwk/compiler-gcc.h>
|
||||
#endif
|
||||
#else /* POSTK_DEBUG_ARCH_DEP_72 */
|
||||
#if __GNUC__ > 4
|
||||
#error no compiler-gcc.h file for this gcc version
|
||||
#elif __GNUC__ == 4
|
||||
# include <lwk/compiler-gcc4.h>
|
||||
|
||||
#if defined(CC_USING_HOTPATCH) && !defined(__CHECKER__)
|
||||
#define notrace __attribute__((hotpatch(0,0)))
|
||||
#else
|
||||
# error Sorry, your compiler is too old/not recognized.
|
||||
#define notrace __attribute__((no_instrument_function))
|
||||
#endif
|
||||
|
||||
/* Intel compiler defines __GNUC__. So we will overwrite implementations
|
||||
* coming from above header files here
|
||||
*/
|
||||
#ifdef __INTEL_COMPILER
|
||||
# include <lwk/compiler-intel.h>
|
||||
#endif
|
||||
|
||||
/* Clang compiler defines __GNUC__. So we will overwrite implementations
|
||||
* coming from above header files here
|
||||
*/
|
||||
#ifdef __clang__
|
||||
#include <lwk/compiler-clang.h>
|
||||
#endif
|
||||
#endif /* POSTK_DEBUG_ARCH_DEP_72 */
|
||||
|
||||
/*
|
||||
* Generic compiler-dependent macros required for kernel
|
||||
@ -64,14 +84,134 @@ extern void __chk_io_ptr(void __iomem *);
|
||||
* specific implementations come from the above header files
|
||||
*/
|
||||
|
||||
struct ftrace_branch_data {
|
||||
const char *func;
|
||||
const char *file;
|
||||
unsigned line;
|
||||
union {
|
||||
struct {
|
||||
unsigned long correct;
|
||||
unsigned long incorrect;
|
||||
};
|
||||
struct {
|
||||
unsigned long miss;
|
||||
unsigned long hit;
|
||||
};
|
||||
unsigned long miss_hit[2];
|
||||
};
|
||||
};
|
||||
|
||||
struct ftrace_likely_data {
|
||||
struct ftrace_branch_data data;
|
||||
unsigned long constant;
|
||||
};
|
||||
|
||||
/*
|
||||
* Note: DISABLE_BRANCH_PROFILING can be used by special lowlevel code
|
||||
* to disable branch tracing on a per file basis.
|
||||
*/
|
||||
#if defined(CONFIG_TRACE_BRANCH_PROFILING) \
|
||||
&& !defined(DISABLE_BRANCH_PROFILING) && !defined(__CHECKER__)
|
||||
void ftrace_likely_update(struct ftrace_likely_data *f, int val,
|
||||
int expect, int is_constant);
|
||||
|
||||
#define likely_notrace(x) __builtin_expect(!!(x), 1)
|
||||
#define unlikely_notrace(x) __builtin_expect(!!(x), 0)
|
||||
|
||||
#define __branch_check__(x, expect, is_constant) ({ \
|
||||
int ______r; \
|
||||
static struct ftrace_likely_data \
|
||||
__attribute__((__aligned__(4))) \
|
||||
__attribute__((section("_ftrace_annotated_branch"))) \
|
||||
______f = { \
|
||||
.data.func = __func__, \
|
||||
.data.file = __FILE__, \
|
||||
.data.line = __LINE__, \
|
||||
}; \
|
||||
______r = __builtin_expect(!!(x), expect); \
|
||||
ftrace_likely_update(&______f, ______r, \
|
||||
expect, is_constant); \
|
||||
______r; \
|
||||
})
|
||||
|
||||
/*
|
||||
* Using __builtin_constant_p(x) to ignore cases where the return
|
||||
* value is always the same. This idea is taken from a similar patch
|
||||
* written by Daniel Walker.
|
||||
*/
|
||||
# ifndef likely
|
||||
# define likely(x) (__branch_check__(x, 1, __builtin_constant_p(x)))
|
||||
# endif
|
||||
# ifndef unlikely
|
||||
# define unlikely(x) (__branch_check__(x, 0, __builtin_constant_p(x)))
|
||||
# endif
|
||||
|
||||
#ifdef CONFIG_PROFILE_ALL_BRANCHES
|
||||
/*
|
||||
* "Define 'is'", Bill Clinton
|
||||
* "Define 'if'", Steven Rostedt
|
||||
*/
|
||||
#define if(cond, ...) __trace_if( (cond , ## __VA_ARGS__) )
|
||||
#define __trace_if(cond) \
|
||||
if (__builtin_constant_p(!!(cond)) ? !!(cond) : \
|
||||
({ \
|
||||
int ______r; \
|
||||
static struct ftrace_branch_data \
|
||||
__attribute__((__aligned__(4))) \
|
||||
__attribute__((section("_ftrace_branch"))) \
|
||||
______f = { \
|
||||
.func = __func__, \
|
||||
.file = __FILE__, \
|
||||
.line = __LINE__, \
|
||||
}; \
|
||||
______r = !!(cond); \
|
||||
______f.miss_hit[______r]++; \
|
||||
______r; \
|
||||
}))
|
||||
#endif /* CONFIG_PROFILE_ALL_BRANCHES */
|
||||
|
||||
#else
|
||||
# define likely(x) __builtin_expect(!!(x), 1)
|
||||
# define unlikely(x) __builtin_expect(!!(x), 0)
|
||||
#endif
|
||||
|
||||
/* Optimization barrier */
|
||||
#ifndef barrier
|
||||
# define barrier() __memory_barrier()
|
||||
#endif
|
||||
|
||||
#ifndef barrier_data
|
||||
# define barrier_data(ptr) barrier()
|
||||
#endif
|
||||
|
||||
/* Unreachable code */
|
||||
#ifndef unreachable
|
||||
# define unreachable() do { } while (1)
|
||||
#endif
|
||||
|
||||
/*
|
||||
* KENTRY - kernel entry point
|
||||
* This can be used to annotate symbols (functions or data) that are used
|
||||
* without their linker symbol being referenced explicitly. For example,
|
||||
* interrupt vector handlers, or functions in the kernel image that are found
|
||||
* programatically.
|
||||
*
|
||||
* Not required for symbols exported with EXPORT_SYMBOL, or initcalls. Those
|
||||
* are handled in their own way (with KEEP() in linker scripts).
|
||||
*
|
||||
* KENTRY can be avoided if the symbols in question are marked as KEEP() in the
|
||||
* linker script. For example an architecture could KEEP() its entire
|
||||
* boot/exception vector code rather than annotate each function and data.
|
||||
*/
|
||||
#ifndef KENTRY
|
||||
# define KENTRY(sym) \
|
||||
extern typeof(sym) sym; \
|
||||
static const unsigned long __kentry_##sym \
|
||||
__used \
|
||||
__attribute__((section("___kentry" "+" #sym ), used)) \
|
||||
= (unsigned long)&sym;
|
||||
#endif
|
||||
|
||||
#ifndef RELOC_HIDE
|
||||
# define RELOC_HIDE(ptr, off) \
|
||||
({ unsigned long __ptr; \
|
||||
@ -79,6 +219,15 @@ extern void __chk_io_ptr(void __iomem *);
|
||||
(typeof(ptr)) (__ptr + (off)); })
|
||||
#endif
|
||||
|
||||
#ifndef OPTIMIZER_HIDE_VAR
|
||||
#define OPTIMIZER_HIDE_VAR(var) barrier()
|
||||
#endif
|
||||
|
||||
/* Not-quite-unique ID. */
|
||||
#ifndef __UNIQUE_ID
|
||||
# define __UNIQUE_ID(prefix) __PASTE(__PASTE(__UNIQUE_ID_, prefix), __LINE__)
|
||||
#endif
|
||||
|
||||
#endif /* __KERNEL__ */
|
||||
|
||||
#endif /* __ASSEMBLY__ */
|
||||
@ -94,10 +243,31 @@ extern void __chk_io_ptr(void __iomem *);
|
||||
# define __deprecated /* unimplemented */
|
||||
#endif
|
||||
|
||||
#ifdef MODULE
|
||||
#define __deprecated_for_modules __deprecated
|
||||
#else
|
||||
#define __deprecated_for_modules
|
||||
#endif
|
||||
|
||||
#ifndef __must_check
|
||||
#define __must_check
|
||||
#endif
|
||||
|
||||
#ifndef CONFIG_ENABLE_MUST_CHECK
|
||||
#undef __must_check
|
||||
#define __must_check
|
||||
#endif
|
||||
#ifndef CONFIG_ENABLE_WARN_DEPRECATED
|
||||
#undef __deprecated
|
||||
#undef __deprecated_for_modules
|
||||
#define __deprecated
|
||||
#define __deprecated_for_modules
|
||||
#endif
|
||||
|
||||
#ifndef __malloc
|
||||
#define __malloc
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Allow us to avoid 'defined but not used' warnings on functions and data,
|
||||
* as well as force them to be emitted to the assembly file.
|
||||
@ -106,31 +276,38 @@ extern void __chk_io_ptr(void __iomem *);
|
||||
* may be elided from the assembly file. As of gcc 3.4, static data not so
|
||||
* marked will not be elided, but this may change in a future gcc version.
|
||||
*
|
||||
* NOTE: Because distributions shipped with a backported unit-at-a-time
|
||||
* compiler in gcc 3.3, we must define __used to be __attribute__((used))
|
||||
* for gcc >=3.3 instead of 3.4.
|
||||
*
|
||||
* In prior versions of gcc, such functions and data would be emitted, but
|
||||
* would be warned about except with attribute((unused)).
|
||||
*
|
||||
* Mark functions that are referenced only in inline assembly as __used so
|
||||
* the code is emitted even though it appears to be unreferenced.
|
||||
*/
|
||||
#ifndef __used
|
||||
# define __used /* unimplemented */
|
||||
#endif
|
||||
|
||||
/*
|
||||
* From the GCC manual:
|
||||
*
|
||||
* Many functions have no effects except the return value and their
|
||||
* return value depends only on the parameters and/or global
|
||||
* variables. Such a function can be subject to common subexpression
|
||||
* elimination and loop optimization just as an arithmetic operator
|
||||
* would be.
|
||||
* [...]
|
||||
*/
|
||||
#ifndef __attribute_pure__
|
||||
# define __attribute_pure__ /* unimplemented */
|
||||
#ifndef __maybe_unused
|
||||
# define __maybe_unused /* unimplemented */
|
||||
#endif
|
||||
|
||||
#ifndef __always_unused
|
||||
# define __always_unused /* unimplemented */
|
||||
#endif
|
||||
|
||||
#ifndef noinline
|
||||
#define noinline
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Rather then using noinline to prevent stack consumption, use
|
||||
* noinline_for_stack instead. For documentation reasons.
|
||||
*/
|
||||
#define noinline_for_stack noinline
|
||||
|
||||
#ifndef __always_inline
|
||||
#define __always_inline inline
|
||||
#endif
|
||||
@ -155,4 +332,162 @@ extern void __chk_io_ptr(void __iomem *);
|
||||
# define __attribute_const__ /* unimplemented */
|
||||
#endif
|
||||
|
||||
#endif /* _LWK_COMPILER_H */
|
||||
#ifndef __designated_init
|
||||
# define __designated_init
|
||||
#endif
|
||||
|
||||
#ifndef __latent_entropy
|
||||
# define __latent_entropy
|
||||
#endif
|
||||
|
||||
#ifndef __randomize_layout
|
||||
# define __randomize_layout __designated_init
|
||||
#endif
|
||||
|
||||
#ifndef __no_randomize_layout
|
||||
# define __no_randomize_layout
|
||||
#endif
|
||||
|
||||
#ifndef randomized_struct_fields_start
|
||||
# define randomized_struct_fields_start
|
||||
# define randomized_struct_fields_end
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Tell gcc if a function is cold. The compiler will assume any path
|
||||
* directly leading to the call is unlikely.
|
||||
*/
|
||||
|
||||
#ifndef __cold
|
||||
#define __cold
|
||||
#endif
|
||||
|
||||
/* Simple shorthand for a section definition */
|
||||
#ifndef __section
|
||||
# define __section(S) __attribute__ ((__section__(#S)))
|
||||
#endif
|
||||
|
||||
#ifndef __visible
|
||||
#define __visible
|
||||
#endif
|
||||
|
||||
/*
|
||||
* Assume alignment of return value.
|
||||
*/
|
||||
#ifndef __assume_aligned
|
||||
#define __assume_aligned(a, ...)
|
||||
#endif
|
||||
|
||||
|
||||
/* Are two types/vars the same type (ignoring qualifiers)? */
|
||||
#ifndef __same_type
|
||||
# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))
|
||||
#endif
|
||||
|
||||
/* Is this type a native word size -- useful for atomic operations */
|
||||
#ifndef __native_word
|
||||
# define __native_word(t) (sizeof(t) == sizeof(char) || sizeof(t) == sizeof(short) || sizeof(t) == sizeof(int) || sizeof(t) == sizeof(long))
|
||||
#endif
|
||||
|
||||
/* Compile time object size, -1 for unknown */
|
||||
#ifndef __compiletime_object_size
|
||||
# define __compiletime_object_size(obj) -1
|
||||
#endif
|
||||
#ifndef __compiletime_warning
|
||||
# define __compiletime_warning(message)
|
||||
#endif
|
||||
#ifndef __compiletime_error
|
||||
# define __compiletime_error(message)
|
||||
/*
|
||||
* Sparse complains of variable sized arrays due to the temporary variable in
|
||||
* __compiletime_assert. Unfortunately we can't just expand it out to make
|
||||
* sparse see a constant array size without breaking compiletime_assert on old
|
||||
* versions of GCC (e.g. 4.2.4), so hide the array from sparse altogether.
|
||||
*/
|
||||
# ifndef __CHECKER__
|
||||
# define __compiletime_error_fallback(condition) \
|
||||
do { ((void)sizeof(char[1 - 2 * condition])); } while (0)
|
||||
# endif
|
||||
#endif
|
||||
#ifndef __compiletime_error_fallback
|
||||
# define __compiletime_error_fallback(condition) do { } while (0)
|
||||
#endif
|
||||
|
||||
#ifdef __OPTIMIZE__
|
||||
# define __compiletime_assert(condition, msg, prefix, suffix) \
|
||||
do { \
|
||||
bool __cond = !(condition); \
|
||||
extern void prefix ## suffix(void) __compiletime_error(msg); \
|
||||
if (__cond) \
|
||||
prefix ## suffix(); \
|
||||
__compiletime_error_fallback(__cond); \
|
||||
} while (0)
|
||||
#else
|
||||
# define __compiletime_assert(condition, msg, prefix, suffix) do { } while (0)
|
||||
#endif
|
||||
|
||||
#define _compiletime_assert(condition, msg, prefix, suffix) \
|
||||
__compiletime_assert(condition, msg, prefix, suffix)
|
||||
|
||||
/**
|
||||
* compiletime_assert - break build and emit msg if condition is false
|
||||
* @condition: a compile-time constant condition to check
|
||||
* @msg: a message to emit if condition is false
|
||||
*
|
||||
* In tradition of POSIX assert, this macro will break the build if the
|
||||
* supplied condition is *false*, emitting the supplied error message if the
|
||||
* compiler has support to do so.
|
||||
*/
|
||||
#define compiletime_assert(condition, msg) \
|
||||
_compiletime_assert(condition, msg, __compiletime_assert_, __LINE__)
|
||||
|
||||
#define compiletime_assert_atomic_type(t) \
|
||||
compiletime_assert(__native_word(t), \
|
||||
"Need native word sized stores/loads for atomicity.")
|
||||
|
||||
/*
|
||||
* Prevent the compiler from merging or refetching accesses. The compiler
|
||||
* is also forbidden from reordering successive instances of ACCESS_ONCE(),
|
||||
* but only when the compiler is aware of some particular ordering. One way
|
||||
* to make the compiler aware of ordering is to put the two invocations of
|
||||
* ACCESS_ONCE() in different C statements.
|
||||
*
|
||||
* ACCESS_ONCE will only work on scalar types. For union types, ACCESS_ONCE
|
||||
* on a union member will work as long as the size of the member matches the
|
||||
* size of the union and the size is smaller than word size.
|
||||
*
|
||||
* The major use cases of ACCESS_ONCE used to be (1) Mediating communication
|
||||
* between process-level code and irq/NMI handlers, all running on the same CPU,
|
||||
* and (2) Ensuring that the compiler does not fold, spindle, or otherwise
|
||||
* mutilate accesses that either do not require ordering or that interact
|
||||
* with an explicit memory barrier or atomic instruction that provides the
|
||||
* required ordering.
|
||||
*
|
||||
* If possible use READ_ONCE()/WRITE_ONCE() instead.
|
||||
*/
|
||||
#define __ACCESS_ONCE(x) ({ \
|
||||
__maybe_unused typeof(x) __var = (__force typeof(x)) 0; \
|
||||
(volatile typeof(x) *)&(x); })
|
||||
#define ACCESS_ONCE(x) (*__ACCESS_ONCE(x))
|
||||
|
||||
/**
|
||||
* lockless_dereference() - safely load a pointer for later dereference
|
||||
* @p: The pointer to load
|
||||
*
|
||||
* Similar to rcu_dereference(), but for situations where the pointed-to
|
||||
* object's lifetime is managed by something other than RCU. That
|
||||
* "something other" might be reference counting or simple immortality.
|
||||
*
|
||||
* The seemingly unused variable ___typecheck_p validates that @p is
|
||||
* indeed a pointer type by using a pointer to typeof(*p) as the type.
|
||||
* Taking a pointer to typeof(*p) again is needed in case p is void *.
|
||||
*/
|
||||
#define lockless_dereference(p) \
|
||||
({ \
|
||||
typeof(p) _________p1 = READ_ONCE(p); \
|
||||
typeof(*(p)) *___typecheck_p __maybe_unused; \
|
||||
smp_read_barrier_depends(); /* Dependency order vs. p above. */ \
|
||||
(_________p1); \
|
||||
})
|
||||
|
||||
#endif /* __LWK_COMPILER_H */
|
||||
|
||||
Reference in New Issue
Block a user