Revision f6c8965ab8de61e26875d48c9e00a018c44d74f7 authored by Martin Michlmayr on 08 February 2006, 21:09:07 UTC, committed by Russell King on 08 February 2006, 21:09:07 UTC
Patch from Martin Michlmayr Minor typographical and spelling fixes in Konfig Signed-off-by: Martin Michlmayr <tbm@cyrius.com> --- Kconfig | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
1 parent f999b8b
dec_and_lock.c
#include <linux/module.h>
#include <linux/spinlock.h>
#include <asm/atomic.h>
/*
* This is an implementation of the notion of "decrement a
* reference count, and return locked if it decremented to zero".
*
* NOTE NOTE NOTE! This is _not_ equivalent to
*
* if (atomic_dec_and_test(&atomic)) {
* spin_lock(&lock);
* return 1;
* }
* return 0;
*
* because the spin-lock and the decrement must be
* "atomic".
*/
int _atomic_dec_and_lock(atomic_t *atomic, spinlock_t *lock)
{
#ifdef CONFIG_SMP
/* Subtract 1 from counter unless that drops it to 0 (ie. it was 1) */
if (atomic_add_unless(atomic, -1, 1))
return 0;
#endif
/* Otherwise do it the slow way */
spin_lock(lock);
if (atomic_dec_and_test(atomic))
return 1;
spin_unlock(lock);
return 0;
}
EXPORT_SYMBOL(_atomic_dec_and_lock);
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