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| author | Peter Zijlstra <peterz@infradead.org> | 2013-10-28 13:55:29 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-10-29 12:01:19 +0100 |
| commit | bf378d341e4873ed928dc3c636252e6895a21f50 (patch) | |
| tree | df69751e469725f2e23da8404884b5540d1bcddc /arch/x86/kernel/nmi.c | |
| parent | cd65718712469ad844467250e8fad20a5838baae (diff) | |
| download | op-kernel-dev-bf378d341e4873ed928dc3c636252e6895a21f50.zip op-kernel-dev-bf378d341e4873ed928dc3c636252e6895a21f50.tar.gz | |
perf: Fix perf ring buffer memory ordering
The PPC64 people noticed a missing memory barrier and crufty old
comments in the perf ring buffer code. So update all the comments and
add the missing barrier.
When the architecture implements local_t using atomic_long_t there
will be double barriers issued; but short of introducing more
conditional barrier primitives this is the best we can do.
Reported-by: Victor Kaplansky <victork@il.ibm.com>
Tested-by: Victor Kaplansky <victork@il.ibm.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
Cc: michael@ellerman.id.au
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: anton@samba.org
Cc: benh@kernel.crashing.org
Link: http://lkml.kernel.org/r/20131025173749.GG19466@laptop.lan
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'arch/x86/kernel/nmi.c')
0 files changed, 0 insertions, 0 deletions
