This is a note to let you know that I've just added the patch titled
perf/x86/intel/lbr: Use setup_clear_cpu_cap() instead of clear_cpu_cap()
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-x86-intel-lbr-use-setup_clear_cpu_cap-instead-o.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9d778db27427eaa13556b6781cf964a35553c3fe
Author: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Date: Mon Jul 18 17:11:19 2022 +0300
perf/x86/intel/lbr: Use setup_clear_cpu_cap() instead of clear_cpu_cap()
[ Upstream commit b329f5ddc9ce4b622d9c7aaf5c6df4de52caf91a ]
clear_cpu_cap(&boot_cpu_data) is very similar to setup_clear_cpu_cap()
except that the latter also sets a bit in 'cpu_caps_cleared' which
later clears the same cap in secondary cpus, which is likely what is
meant here.
Fixes: 47125db27e47 ("perf/x86/intel/lbr: Support Architectural LBR")
Signed-off-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
Reviewed-by: Kan Liang <kan.liang@xxxxxxxxxxxxxxx>
Link: https://lkml.kernel.org/r/20220718141123.136106-2-mlevitsk@xxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/x86/events/intel/lbr.c b/arch/x86/events/intel/lbr.c
index 673721387391..b3f92255cbd2 100644
--- a/arch/x86/events/intel/lbr.c
+++ b/arch/x86/events/intel/lbr.c
@@ -1847,7 +1847,7 @@ void __init intel_pmu_arch_lbr_init(void)
return;
clear_arch_lbr:
- clear_cpu_cap(&boot_cpu_data, X86_FEATURE_ARCH_LBR);
+ setup_clear_cpu_cap(X86_FEATURE_ARCH_LBR);
}
/**
