diff options
author | Jeff Garzik <jgarzik@pobox.com> | 2005-10-06 05:51:07 -0400 |
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committer | Jeff Garzik <jgarzik@pobox.com> | 2005-10-06 05:51:07 -0400 |
commit | 012e060c95e547eceea4a12c6f58592473bf4011 (patch) | |
tree | b57d3eafb50ce517577d2cf366c9ef0b4b286589 /arch/mips/lib/dec_and_lock.c | |
parent | 923f122573851d18a3832ca808269fa2d5046fb1 (diff) | |
parent | ed39f731ab2e77e58122232f6e27333331d7793d (diff) |
Merge branch 'master'
Diffstat (limited to 'arch/mips/lib/dec_and_lock.c')
-rw-r--r-- | arch/mips/lib/dec_and_lock.c | 47 |
1 files changed, 0 insertions, 47 deletions
diff --git a/arch/mips/lib/dec_and_lock.c b/arch/mips/lib/dec_and_lock.c deleted file mode 100644 index fd82c84a93b..00000000000 --- a/arch/mips/lib/dec_and_lock.c +++ /dev/null @@ -1,47 +0,0 @@ -/* - * MIPS version of atomic_dec_and_lock() using cmpxchg - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#include <linux/module.h> -#include <linux/spinlock.h> -#include <asm/atomic.h> -#include <asm/system.h> - -/* - * This is an implementation of the notion of "decrement a - * reference count, and return locked if it decremented to zero". - * - * This implementation can be used on any architecture that - * has a cmpxchg, and where atomic->value is an int holding - * the value of the atomic (i.e. the high bits aren't used - * for a lock or anything like that). - */ -int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock) -{ - int counter; - int newcount; - - for (;;) { - counter = atomic_read(atomic); - newcount = counter - 1; - if (!newcount) - break; /* do it the slow way */ - - newcount = cmpxchg(&atomic->counter, counter, newcount); - if (newcount == counter) - return 0; - } - - spin_lock(lock); - if (atomic_dec_and_test(atomic)) - return 1; - spin_unlock(lock); - return 0; -} - -EXPORT_SYMBOL(_atomic_dec_and_lock); |