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e9e8543fec
The mmiowb() macro is horribly difficult to use and drivers will continue to work most of the time if they omit a call when it is required. Rather than rely on driver authors getting this right, push mmiowb() into arch_spin_unlock() for sh. If this is deemed to be a performance issue, a subsequent optimisation could make use of ARCH_HAS_MMIOWB to elide the barrier in cases where no I/O writes were performed inside the critical section. Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Cc: Rich Felker <dalias@libc.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com>
13 lines
246 B
C
13 lines
246 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef __ASM_SH_MMIOWB_H
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#define __ASM_SH_MMIOWB_H
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#include <asm/barrier.h>
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/* synco on SH-4A, otherwise a nop */
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#define mmiowb() wmb()
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#include <asm-generic/mmiowb.h>
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#endif /* __ASM_SH_MMIOWB_H */
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