Ubuntu-focal-kernel/arch/mips/include/asm/mmiowb.h

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _ASM_MMIOWB_H
#define _ASM_MMIOWB_H

#include <asm/io.h>

#define mmiowb()	iobarrier_w()

#include <asm-generic/mmiowb.h>

#endif	/* _ASM_MMIOWB_H */
mips/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() 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 mips. 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. Acked-by: Paul Burton <paul.burton@mips.com> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Will Deacon <will.deacon@arm.com> 2019-02-22 13:37:21 +00:00			`/* SPDX-License-Identifier: GPL-2.0 */`
			`#ifndef _ASM_MMIOWB_H`
			`#define _ASM_MMIOWB_H`

			`#include <asm/io.h>`

			`#define mmiowb() iobarrier_w()`

			`#include <asm-generic/mmiowb.h>`

			`#endif /* _ASM_MMIOWB_H */`