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[PATCH] remove generic__raw_read_trylock()

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If the cpu has the lock held for write, is interrupted, and the interrupt
handler calls read_trylock(), it's an instant deadlock.

Now, Dave Miller has subsequently pointed out that we don't have any
situations where this can occur.  Nevertheless, we should delete
generic__raw_read_lock (and its associated EXPORT to make Arjan happy) so that
nobody thinks they can use it.

Acked-by: "David S. Miller" <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Matthew Wilcox 2006-09-29 01:58:36 -07:00 committed by Linus Torvalds
parent e04da1dfd9
commit 910067d188
1 changed files with 0 additions and 11 deletions
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11
kernel/spinlock.c
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@ -21,17 +21,6 @@
#include <linux/debug_locks.h>
#include <linux/module.h>
/*
* Generic declaration of the raw read_trylock() function,
* architectures are supposed to optimize this:
*/
int __lockfunc generic__raw_read_trylock(raw_rwlock_t *lock)
{
__raw_read_lock(lock);
return 1;
}
EXPORT_SYMBOL(generic__raw_read_trylock);
int __lockfunc _spin_trylock(spinlock_t *lock)
{
preempt_disable();