WSL2-Linux-Kernel/arch/xtensa/include/asm/barrier.h

/*
 * This file is subject to the terms and conditions of the GNU General Public
 * License.  See the file "COPYING" in the main directory of this archive
 * for more details.
 *
 * Copyright (C) 2001 - 2012 Tensilica Inc.
 */

#ifndef _XTENSA_SYSTEM_H
#define _XTENSA_SYSTEM_H

#define mb()  ({ __asm__ __volatile__("memw" : : : "memory"); })
#define rmb() barrier()
#define wmb() mb()

#define __smp_mb__before_atomic()		barrier()
#define __smp_mb__after_atomic()		barrier()

#include <asm-generic/barrier.h>

#endif /* _XTENSA_SYSTEM_H */
Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Xtensa. Signed-off-by: David Howells <dhowells@redhat.com> cc: Chris Zankel <chris@zankel.net> 2012-03-28 21:30:03 +04:00			`/*`
			`* This file is subject to the terms and conditions of the GNU General Public`
			`* License. See the file "COPYING" in the main directory of this archive`
			`* for more details.`
			`*`
xtensa: fix mb and wmb definitions Define mb and wmb as memw to force memory barrier. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net> 2012-11-24 06:22:08 +04:00			`* Copyright (C) 2001 - 2012 Tensilica Inc.`
Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Xtensa. Signed-off-by: David Howells <dhowells@redhat.com> cc: Chris Zankel <chris@zankel.net> 2012-03-28 21:30:03 +04:00			`*/`

			`#ifndef _XTENSA_SYSTEM_H`
			`#define _XTENSA_SYSTEM_H`

xtensa: fix mb and wmb definitions Define mb and wmb as memw to force memory barrier. Signed-off-by: Max Filippov <jcmvbkbc@gmail.com> Signed-off-by: Chris Zankel <chris@zankel.net> 2012-11-24 06:22:08 +04:00			`#define mb() ({ __asm__ __volatile__("memw" : : : "memory"); })`
			`#define rmb() barrier()`
Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Xtensa. Signed-off-by: David Howells <dhowells@redhat.com> cc: Chris Zankel <chris@zankel.net> 2012-03-28 21:30:03 +04:00			`#define wmb() mb()`

xtensa: define __smp_xxx This defines __smp_xxx barriers for xtensa, for use by virtualization. smp_xxx barriers are removed as they are defined correctly by asm-generic/barriers.h Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> 2015-12-27 16:04:42 +03:00			`#define __smp_mb__before_atomic() barrier()`
			`#define __smp_mb__after_atomic() barrier()`
arch,xtensa: Convert smp_mb__*() Xtensa SMP has compare-and-swap which is fully serializing, therefore its exising smp_mb__{before,after}_clear_bit() appear unduly heavy. Implement the new barriers as barrier(). Signed-off-by: Peter Zijlstra <peterz@infradead.org> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/n/tip-e9rqjxr1m1ejsob9p433kmji@git.kernel.org Cc: Chris Zankel <chris@zankel.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: linux-kernel@vger.kernel.org Cc: linux-xtensa@linux-xtensa.org Signed-off-by: Ingo Molnar <mingo@kernel.org> 2014-03-13 22:00:35 +04:00
arch: Clean up asm/barrier.h implementations using asm-generic/barrier.h We're going to be adding a few new barrier primitives, and in order to avoid endless duplication make more agressive use of asm-generic/barrier.h. Change the asm-generic/barrier.h such that it allows partial barrier definitions and fills out the rest with defaults. There are a few architectures (m32r, m68k) that could probably do away with their barrier.h file entirely but are kept for now due to their unconventional nop() implementation. Suggested-by: Geert Uytterhoeven <geert@linux-m68k.org> Reviewed-by: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Michael Ellerman <michael@ellerman.id.au> Cc: Michael Neuling <mikey@neuling.org> Cc: Russell King <linux@arm.linux.org.uk> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Martin Schwidefsky <schwidefsky@de.ibm.com> Cc: Victor Kaplansky <VICTORK@il.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Link: http://lkml.kernel.org/r/20131213150640.846368594@infradead.org Signed-off-by: Ingo Molnar <mingo@kernel.org> 2013-11-06 17:57:36 +04:00			`#include <asm-generic/barrier.h>`
Disintegrate asm/system.h for Xtensa Disintegrate asm/system.h for Xtensa. Signed-off-by: David Howells <dhowells@redhat.com> cc: Chris Zankel <chris@zankel.net> 2012-03-28 21:30:03 +04:00
			`#endif /* _XTENSA_SYSTEM_H */`