mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
779a6a3696
As per: lkml.kernel.org/r/20150921112252.3c2937e1@mschwide atomics imply a barrier on s390, so s390 should change smp_mb__before_atomic and smp_mb__after_atomic to barrier() instead of smp_mb() and hence should not use the generic versions. Suggested-by: Peter Zijlstra <peterz@infradead.org> Suggested-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Michael S. Tsirkin <mst@redhat.com> Acked-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
54 lines
1.2 KiB
C
54 lines
1.2 KiB
C
/*
|
|
* Copyright IBM Corp. 1999, 2009
|
|
*
|
|
* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
|
|
*/
|
|
|
|
#ifndef __ASM_BARRIER_H
|
|
#define __ASM_BARRIER_H
|
|
|
|
/*
|
|
* Force strict CPU ordering.
|
|
* And yes, this is required on UP too when we're talking
|
|
* to devices.
|
|
*/
|
|
|
|
#ifdef CONFIG_HAVE_MARCH_Z196_FEATURES
|
|
/* Fast-BCR without checkpoint synchronization */
|
|
#define __ASM_BARRIER "bcr 14,0\n"
|
|
#else
|
|
#define __ASM_BARRIER "bcr 15,0\n"
|
|
#endif
|
|
|
|
#define mb() do { asm volatile(__ASM_BARRIER : : : "memory"); } while (0)
|
|
|
|
#define rmb() barrier()
|
|
#define wmb() barrier()
|
|
#define dma_rmb() mb()
|
|
#define dma_wmb() mb()
|
|
#define __smp_mb() mb()
|
|
#define __smp_rmb() rmb()
|
|
#define __smp_wmb() wmb()
|
|
|
|
#define __smp_store_release(p, v) \
|
|
do { \
|
|
compiletime_assert_atomic_type(*p); \
|
|
barrier(); \
|
|
WRITE_ONCE(*p, v); \
|
|
} while (0)
|
|
|
|
#define __smp_load_acquire(p) \
|
|
({ \
|
|
typeof(*p) ___p1 = READ_ONCE(*p); \
|
|
compiletime_assert_atomic_type(*p); \
|
|
barrier(); \
|
|
___p1; \
|
|
})
|
|
|
|
#define __smp_mb__before_atomic() barrier()
|
|
#define __smp_mb__after_atomic() barrier()
|
|
|
|
#include <asm-generic/barrier.h>
|
|
|
|
#endif /* __ASM_BARRIER_H */
|