The patch titled
Subject: arch/x86/kernel/cpu/perf_event_msr.c: use sign_extend64() for sign extension
has been added to the -mm tree. Its filename is
arch-x86-use-sign_extend64-for-sign-extension.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/arch-x86-use-sign_extend64-for-sign-extension.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/arch-x86-use-sign_extend64-for-sign-extension.patch
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------------------------------------------------------
From: Martin Kepplinger <martink@xxxxxxxxx>
Subject: arch/x86/kernel/cpu/perf_event_msr.c: use sign_extend64() for sign extension
Signed-off-by: Martin Kepplinger <martin.kepplinger@xxxxxxxxxxxxxxxxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: George Spelvin <linux@xxxxxxxxxxx>
Cc: Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx>
Cc: Maxime Coquelin <maxime.coquelin@xxxxxx>
Cc: Denys Vlasenko <dvlasenk@xxxxxxxxxx>
Cc: Yury Norov <yury.norov@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/cpu/perf_event_msr.c | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff -puN arch/x86/kernel/cpu/perf_event_msr.c~arch-x86-use-sign_extend64-for-sign-extension arch/x86/kernel/cpu/perf_event_msr.c
--- a/arch/x86/kernel/cpu/perf_event_msr.c~arch-x86-use-sign_extend64-for-sign-extension
+++ a/arch/x86/kernel/cpu/perf_event_msr.c
@@ -163,10 +163,9 @@ again:
goto again;
delta = now - prev;
- if (unlikely(event->hw.event_base == MSR_SMI_COUNT)) {
- delta <<= 32;
- delta >>= 32; /* sign extend */
- }
+ if (unlikely(event->hw.event_base == MSR_SMI_COUNT))
+ delta = sign_extend64(delta, 31);
+
local64_add(now - prev, &event->count);
}
_
Patches currently in -mm which might be from martink@xxxxxxxxx are
bitopsh-improve-sign_extend32s-documentation.patch
bitopsh-add-sign_extend64.patch
arch-sh-use-sign_extend64-for-sign-extension.patch
arch-sh-use-sign_extend64-for-sign-extension-2.patch
arch-x86-use-sign_extend64-for-sign-extension.patch
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