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Peter Zijlstra
bf378d341e
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 <[email protected]> Tested-by: Victor Kaplansky <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Cc: Mathieu Desnoyers <[email protected]> Cc: [email protected] Cc: Paul McKenney <[email protected]> Cc: Michael Neuling <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: [email protected] Cc: [email protected] Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]>