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| author |   Will Deacon <will.deacon@arm.com> | 2019-02-22 12:48:44 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2019-04-08 11:59:39 +0100 |
| commit | d1be6a28b13ce6d1bc42bf9b6a9454c65839225b (patch) | |
| tree | 320fd6244998529491991e7012ebfc5dd9709d4a /kernel/Kconfig.locks | |
| parent | docs/memory-barriers.txt: Rewrite "KERNEL I/O BARRIER EFFECTS" section (diff) | |
| download | linux-dev-d1be6a28b13ce6d1bc42bf9b6a9454c65839225b.tar.xz linux-dev-d1be6a28b13ce6d1bc42bf9b6a9454c65839225b.zip | |
asm-generic/mmiowb: Add generic implementation of mmiowb() tracking
In preparation for removing all explicit mmiowb() calls from driver
code, implement a tracking system in asm-generic based loosely on the
PowerPC implementation. This allows architectures with a non-empty
mmiowb() definition to have the barrier automatically inserted in
spin_unlock() following a critical section containing an I/O write.
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'kernel/Kconfig.locks')
| -rw-r--r-- | kernel/Kconfig.locks | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/Kconfig.locks b/kernel/Kconfig.locks index fbba478ae522..6ba2570eddad 100644 --- a/kernel/Kconfig.locks +++ b/kernel/Kconfig.locks @@ -251,3 +251,10 @@ config ARCH_USE_QUEUED_RWLOCKS config QUEUED_RWLOCKS def_bool y if ARCH_USE_QUEUED_RWLOCKS depends on SMP + +config ARCH_HAS_MMIOWB + bool + +config MMIOWB + def_bool y if ARCH_HAS_MMIOWB + depends on SMP |