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asm-generic/mmiowb: Add generic implementation of mmiowb() tracking

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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 <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
This commit is contained in:
Will Deacon 2019-02-22 12:48:44 +00:00
commit d1be6a28b1
4 changed files with 89 additions and 0 deletions
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7
kernel/Kconfig.locks
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@ -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