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e3e45c01ae
The following patch makes the microcode update code path actually invoke the perf_check_microcode() function and thus potentially renabling SNB PEBS. By default, CONFIG_MICROCODE_OLD_INTERFACE is forced to Y in arch/x86/Kconfig. There is no way to disable this. That means that the code path used in arch/x86/kernel/microcode_core.c did not include the call to perf_check_microcode(). Thus, even though the microcode was updated to a version that fixes the SNB PEBS problem, perf_event would still return EOPNOTSUPP when enabling precise sampling. This patch simply adds a call to perf_check_microcode() in the call path used when OLD_INTERFACE=y. Signed-off-by: Stephane Eranian <eranian@google.com> Acked-by: Borislav Petkov <borislav.petkov@amd.com> Cc: peterz@infradead.org Cc: andi@firstfloor.org Link: http://lkml.kernel.org/r/20120824133434.GA8014@quad Signed-off-by: Ingo Molnar <mingo@kernel.org> |
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