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[PATCH] lockdep: add local_irq_enable_in_hardirq() API

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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: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Ingo Molnar 2006-07-03 00:24:27 -07:00 committed by Linus Torvalds
parent c01d403b2e
commit d7e9629de0
1 changed files with 17 additions and 0 deletions
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17
include/linux/interrupt.h
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@ -80,6 +80,23 @@ extern int request_irq(unsigned int,
unsigned long, const char *, void *); unsigned long, const char *, void *);
extern void free_irq(unsigned int, 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 #ifdef CONFIG_GENERIC_HARDIRQS
extern void disable_irq_nosync(unsigned int irq); extern void disable_irq_nosync(unsigned int irq);