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kprintf: only call eventfd() if it is safe to interrupt

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Missing ARM64 implementation, cannot test right now

Change-Id: Ia05e8b7952b19bcd8fdac1f920d9bfe341be8b97
This commit is contained in:
Dominique Martinet
2018-06-18 18:05:07 +09:00
committed by Dominique Martinet
parent 6df4bd8f8c
commit ad2cb6375a
3 changed files with 18 additions and 4 deletions
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7
arch/arm64/kernel/include/arch-lock.h
View File

@ -604,4 +604,11 @@ __mcs_rwlock_reader_unlock(struct mcs_rwlock_lock *lock, struct mcs_rwlock_node_
#endif
}
static inline int irqflags_can_interrupt(unsigned long flags)
{
#warning "arm64 irqflags_can_interrupt not implemented"
return true;
}
#endif /* !__HEADER_ARM64_COMMON_ARCH_LOCK_H */

5
arch/x86_64/kernel/include/arch-lock.h
View File

@ -602,4 +602,9 @@ __mcs_rwlock_reader_unlock(struct mcs_rwlock_lock *lock, struct mcs_rwlock_node_
#endif
}
static inline int irqflags_can_interrupt(unsigned long flags)
{
return !!(flags & 0x200);
}
#endif

10
kernel/debug.c
View File

@ -84,7 +84,8 @@ void kputs(char *buf)
debug_spin_unlock_irqrestore(&kmsg_buf->lock, flags_inner);
kprintf_unlock(flags_outer);
if (DEBUG_KMSG_USED > IHK_KMSG_HIGH_WATER_MARK) {
if (irqflags_can_interrupt(flags_outer) &&
DEBUG_KMSG_USED > IHK_KMSG_HIGH_WATER_MARK) {
eventfd(IHK_OS_EVENTFD_TYPE_KMSG);
ihk_mc_delay_us(IHK_KMSG_NOTIFY_DELAY);
}
@ -123,8 +124,8 @@ int __kprintf(const char *format, ...)
}
debug_spin_unlock_irqrestore(&kmsg_buf->lock, flags_inner);
if (DEBUG_KMSG_USED > IHK_KMSG_HIGH_WATER_MARK) {
if (irqflags_can_interrupt(flags_inner) &&
DEBUG_KMSG_USED > IHK_KMSG_HIGH_WATER_MARK) {
eventfd(IHK_OS_EVENTFD_TYPE_KMSG);
ihk_mc_delay_us(IHK_KMSG_NOTIFY_DELAY);
}
@ -165,7 +166,8 @@ int kprintf(const char *format, ...)
debug_spin_unlock_irqrestore(&kmsg_buf->lock, flags_inner);
kprintf_unlock(flags_outer);
if (DEBUG_KMSG_USED > IHK_KMSG_HIGH_WATER_MARK) {
if (irqflags_can_interrupt(flags_outer) &&
DEBUG_KMSG_USED > IHK_KMSG_HIGH_WATER_MARK) {
eventfd(IHK_OS_EVENTFD_TYPE_KMSG);
ihk_mc_delay_us(IHK_KMSG_NOTIFY_DELAY);
}