[PATCH] remove generic__raw_read_trylock()
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>
diff --git a/kernel/spinlock.c b/kernel/spinlock.c
index 9644a41..d48143e 100644
--- a/kernel/spinlock.c
+++ b/kernel/spinlock.c
@@ -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();