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authorPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-01-15 00:32:50 +0300
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2017-04-18 21:20:15 +0300
commit77e5849688670280b173bb9e0544e9da7b2acc36 (patch)
tree7d1bab5108080b74bca1c7a8d54e3be22c67c6e2 /arch/Kconfig
parentb8c17e6664c461e4aed545a943304c3b32dd309c (diff)
downloadlinux-77e5849688670280b173bb9e0544e9da7b2acc36.tar.xz
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/Kconfig')
-rw-r--r--arch/Kconfig3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/Kconfig b/arch/Kconfig
index cd211a14a88f..adefaf344239 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -320,6 +320,9 @@ config HAVE_CMPXCHG_LOCAL
config HAVE_CMPXCHG_DOUBLE
bool
+config ARCH_WEAK_RELEASE_ACQUIRE
+ bool
+
config ARCH_WANT_IPC_PARSE_VERSION
bool