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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-01-14 22:32:50 +0100
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-04-18 20:20:15 +0200
commit77e5849688670280b173bb9e0544e9da7b2acc36 (patch)
tree7d1bab5108080b74bca1c7a8d54e3be22c67c6e2 /arch/powerpc
parentrcu: Maintain special bits at bottom of ->dynticks counter (diff)
downloadlinux-77e5849688670280b173bb9e0544e9da7b2acc36.tar.xz
linux-77e5849688670280b173bb9e0544e9da7b2acc36.zip
rcu: Make arch select smp_mb__after_unlock_lock() strength
The definition of smp_mb__after_unlock_lock() is currently smp_mb() for CONFIG_PPC and a no-op otherwise. It would be better to instead provide an architecture-selectable Kconfig option, and select the strength of smp_mb__after_unlock_lock() based on that option. This commit therefore creates ARCH_WEAK_RELEASE_ACQUIRE, has PPC select it, and bases the definition of smp_mb__after_unlock_lock() on this new ARCH_WEAK_RELEASE_ACQUIRE Kconfig option. Reported-by: Ingo Molnar <mingo@kernel.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Will Deacon <will.deacon@arm.com> Cc: Boqun Feng <boqun.feng@linux.vnet.ibm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Acked-by: Michael Ellerman <mpe@ellerman.id.au> Cc: <linuxppc-dev@lists.ozlabs.org> Reviewed-by: Josh Triplett <josh@joshtriplett.org>
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 97a8bc8a095c..7a5c9b764cd2 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -99,6 +99,7 @@ config PPC
select ARCH_USE_BUILTIN_BSWAP
select ARCH_USE_CMPXCHG_LOCKREF if PPC64
select ARCH_WANT_IPC_PARSE_VERSION
+ select ARCH_WEAK_RELEASE_ACQUIRE
select BINFMT_ELF
select BUILDTIME_EXTABLE_SORT
select CLONE_BACKWARDS