]> git.karo-electronics.de Git - linux-beck.git/commitdiff
[PATCH] remove generic__raw_read_trylock()
authorMatthew Wilcox <matthew@wil.cx>
Fri, 29 Sep 2006 08:58:36 +0000 (01:58 -0700)
committerLinus Torvalds <torvalds@g5.osdl.org>
Fri, 29 Sep 2006 16:18:03 +0000 (09:18 -0700)
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>
kernel/spinlock.c

index 9644a41e0bef60fd40773976705c6529b49c45d1..d48143eafbfde6388717e67c1c3b74011ea8a747 100644 (file)
 #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();