powerpc/64: Fix smp_wmb barrier definition use use lwsync consistently

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commit 0bfdf59890 upstream.

asm/barrier.h is not always included after asm/synch.h, which meant
it was missing __SUBARCH_HAS_LWSYNC, so in some files smp_wmb() would
be eieio when it should be lwsync. kernel/time/hrtimer.c is one case.

__SUBARCH_HAS_LWSYNC is only used in one place, so just fold it in
to where it's used. Previously with my small simulator config, 377
instances of eieio in the tree. After this patch there are 55.

Fixes: 46d075be58 ("powerpc: Optimise smp_wmb")
Cc: stable@vger.kernel.org # v2.6.29+
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Nicholas Piggin 2018-03-22 20:41:46 +10:00 • committed by Greg Kroah-Hartman

parent 1699bd0374

commit 3df05fcf89

2 changed files with 2 additions and 5 deletions

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3

arch/powerpc/include/asm/barrier.h

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4

arch/powerpc/include/asm/synch.h

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