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| author | Will Deacon | 2019-02-22 14:37:21 +0100 |
|---|---|---|
| committer | Will Deacon | 2019-04-08 13:00:21 +0200 |
| commit | e9e8543fecd2e1ca53616ba82fbd55a25cd2ab8a (patch) | |
| tree | a6139b9501c2b950c997f83273fcb5936c77dd2b /arch/mips/include | |
| parent | m68k/io: Remove useless definition of mmiowb() (diff) | |
| download | kernel-qcow2-linux-e9e8543fecd2e1ca53616ba82fbd55a25cd2ab8a.tar.gz kernel-qcow2-linux-e9e8543fecd2e1ca53616ba82fbd55a25cd2ab8a.tar.xz kernel-qcow2-linux-e9e8543fecd2e1ca53616ba82fbd55a25cd2ab8a.zip | |
sh/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 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>
Diffstat (limited to 'arch/mips/include')
0 files changed, 0 insertions, 0 deletions