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author | Will Deacon | 2019-02-22 14:37:21 +0100 |
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committer | Will Deacon | 2019-04-08 13:00:28 +0200 |
commit | 346e91ee090b07da8d15e36bc3169ddea6968713 (patch) | |
tree | 8ec14892fbf565049c4ffa4a23d628514da4e991 /arch/ia64/include/uapi/asm/termbits.h | |
parent | sh/mmiowb: Add unconditional mmiowb() to arch_spin_unlock() (diff) | |
download | kernel-qcow2-linux-346e91ee090b07da8d15e36bc3169ddea6968713.tar.gz kernel-qcow2-linux-346e91ee090b07da8d15e36bc3169ddea6968713.tar.xz kernel-qcow2-linux-346e91ee090b07da8d15e36bc3169ddea6968713.zip |
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>
Diffstat (limited to 'arch/ia64/include/uapi/asm/termbits.h')
0 files changed, 0 insertions, 0 deletions