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schedule(): do not preempt while holding spinlocks or while in offloaded syscall

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This commit is contained in:
Balazs Gerofi
2015-08-06 10:36:13 +09:00
parent b77755d0f7
commit 328e69a335
7 changed files with 39 additions and 0 deletions
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8
arch/x86/kernel/include/arch-lock.h
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@ -14,6 +14,9 @@ int __kprintf(const char *format, ...);
typedef int ihk_spinlock_t;
extern void preempt_enable(void);
extern void preempt_disable(void);
#define IHK_STATIC_SPINLOCK_FUNCS
static void ihk_mc_spinlock_init(ihk_spinlock_t *lock)
@ -45,6 +48,9 @@ static void ihk_mc_spinlock_lock_noirq(ihk_spinlock_t *lock)
__kprintf("[%d] trying to grab lock: 0x%lX\n",
ihk_mc_get_processor_id(), lock);
#endif
preempt_disable();
asm volatile("lock; xaddl %0, %1\n"
"movzwl %w0, %2\n\t"
"shrl $16, %0\n\t"
@ -79,6 +85,8 @@ static unsigned long ihk_mc_spinlock_lock(ihk_spinlock_t *lock)
static void ihk_mc_spinlock_unlock_noirq(ihk_spinlock_t *lock)
{
asm volatile ("lock incw %0" : "+m"(*lock) : : "memory", "cc");
preempt_enable();
}
static void ihk_mc_spinlock_unlock(ihk_spinlock_t *lock, unsigned long flags)