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/*
* Copyright (c) 2000 Silicon Graphics, Inc. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
*
* Further, this software is distributed without any warranty that it is
* free of the rightful claim of any third person regarding infringement
* or the like. Any license provided herein, whether implied or
* otherwise, applies only to this software file. Patent licenses, if
* any, provided herein do not apply to combinations of this program with
* other software, or any other product whatsoever.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write the Free Software Foundation, Inc., 59
* Temple Place - Suite 330, Boston MA 02111-1307, USA.
*
* Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
* Mountain View, CA 94043, or:
*
* http://www.sgi.com
*
* For further information regarding this notice, see:
*
* http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
*/
#ifndef __XFS_SUPPORT_ATOMIC_H__
#define __XFS_SUPPORT_ATOMIC_H__
#include <linux/version.h>
#include <linux/time.h>
#include <linux/wait.h>
#include <linux/sched.h>
#include <asm/atomic.h>
#include <asm/semaphore.h>
/*
* This is used for two variables in XFS, one of which is a debug trace
* buffer index. They are not accessed via any other atomic operations
* so this is safe. All other atomic increments and decrements in XFS
* now use the linux built in functions.
*/
extern spinlock_t Atomic_spin;
static __inline__ int atomicIncWithWrap(int *ip, int val)
{
unsigned long flags;
int ret;
spin_lock_irqsave(&Atomic_spin, flags);
ret = *ip;
(*ip)++;
if (*ip == val) *ip = 0;
spin_unlock_irqrestore(&Atomic_spin, flags);
return ret;
}
#endif /* __XFS_SUPPORT_ATOMIC_H__ */
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