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| author | Peter Zijlstra <peterz@infradead.org> | 2013-10-28 13:55:29 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-11-20 12:31:39 -0800 |
| commit | 57b0a9d310c0b1373fbbeee2aa0caec12cd74c5e (patch) | |
| tree | dd6d7d0cc039c5e1997a14294761767c54973c79 /drivers/edac | |
| parent | 747b00783906993edb8289641d92663e87b3a3f3 (diff) | |
| download | lwn-57b0a9d310c0b1373fbbeee2aa0caec12cd74c5e.tar.gz lwn-57b0a9d310c0b1373fbbeee2aa0caec12cd74c5e.zip | |
perf: Fix perf ring buffer memory ordering
commit bf378d341e4873ed928dc3c636252e6895a21f50 upstream.
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>
Cc: Michael Neuling <mikey@neuling.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/edac')
0 files changed, 0 insertions, 0 deletions