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Commit d7e9629d authored by Ingo Molnar's avatar Ingo Molnar Committed by Linus Torvalds
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[PATCH] lockdep: add local_irq_enable_in_hardirq() API 



Introduce local_irq_enable_in_hardirq() API.  It is currently aliased to
local_irq_enable(), hence has no functional effects.

This API will be used by lockdep, but even without lockdep this will better
document places in the kernel where a hardirq context enables hardirqs.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c01d403b

include/linux/interrupt.h

+17 −0
Original line number Diff line number Diff line
@@ -80,6 +80,23 @@ extern int request_irq(unsigned int, 
		       unsigned long, const char *, void *);

extern void free_irq(unsigned int, void *);



/*

 * On lockdep we dont want to enable hardirqs in hardirq

 * context. Use local_irq_enable_in_hardirq() to annotate

 * kernel code that has to do this nevertheless (pretty much

 * the only valid case is for old/broken hardware that is

 * insanely slow).

 *

 * NOTE: in theory this might break fragile code that relies

 * on hardirq delivery - in practice we dont seem to have such

 * places left. So the only effect should be slightly increased

 * irqs-off latencies.

 */

#ifdef CONFIG_LOCKDEP

# define local_irq_enable_in_hardirq()	do { } while (0)

#else

# define local_irq_enable_in_hardirq()	local_irq_enable()

#endif



#ifdef CONFIG_GENERIC_HARDIRQS

extern void disable_irq_nosync(unsigned int irq);