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openrisc: Define memory barrier mb

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This came up in the discussion of the requirements of qspinlock on an
architecture.  OpenRISC uses qspinlock, but it was noticed that the
memmory barrier was not defined.

Peter defined it in the mail thread writing:

    As near as I can tell this should do. The arch spec only lists
    this one instruction and the text makes it sound like a completion
    barrier.

This is correct so applying this patch.

Signed-off-by: Peter Zijlstra <peterz@infradead.org>
[shorne@gmail.com:Turned the mail into a patch]
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Peter Zijlstra 2021-04-14 14:45:43 +02:00 committed by Stafford Horne
parent 371dcaee1a
commit 8b549c18ae
1 changed files with 9 additions and 0 deletions
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9
arch/openrisc/include/asm/barrier.h Normal file
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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_BARRIER_H
#define __ASM_BARRIER_H
#define mb() asm volatile ("l.msync" ::: "memory")
#include <asm-generic/barrier.h>
#endif /* __ASM_BARRIER_H */