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Mutex documentation is unclear about software interrupts, tasklets and timers

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Acked-by: Arjan van de Ven <arjan@linux.intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Matti Linnanvuori 2007-10-16 23:29:41 -07:00 • committed by Linus Torvalds
parent 1019f96d2d
commit f20fda4861
2 changed files with 4 additions and 2 deletions
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3
Documentation/mutex-design.txt
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@ -90,7 +90,8 @@ of advantages of mutexes:
* - task may not exit with mutex held * - task may not exit with mutex held
* - memory areas where held locks reside must not be freed * - memory areas where held locks reside must not be freed
* - held mutexes must not be reinitialized * - held mutexes must not be reinitialized
* - mutexes may not be used in irq contexts * - mutexes may not be used in hardware or software interrupt
* contexts such as tasklets and timers
furthermore, there are also convenience features in the debugging furthermore, there are also convenience features in the debugging
code: code:

3
include/linux/mutex.h
View file

@ -29,7 +29,8 @@
* - task may not exit with mutex held * - task may not exit with mutex held
* - memory areas where held locks reside must not be freed * - memory areas where held locks reside must not be freed
* - held mutexes must not be reinitialized * - held mutexes must not be reinitialized
* - mutexes may not be used in irq contexts * - mutexes may not be used in hardware or software interrupt
* contexts such as tasklets and timers
* *
* These semantics are fully enforced when DEBUG_MUTEXES is * These semantics are fully enforced when DEBUG_MUTEXES is
* enabled. Furthermore, besides enforcing the above rules, the mutex * enabled. Furthermore, besides enforcing the above rules, the mutex