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linux/arch/x86/events
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Stephane Eranian d1e7e602cd perf/x86/intel: Move regs->flags EXACT bit init 
This patch removes a redundant store on regs->flags introduced
by commit:

  71eb9ee959 ("perf/x86/intel: Fix linear IP of PEBS real_ip on Haswell and later CPUs")

We were clearing the PERF_EFLAGS_EXACT but it was overwritten by
regs->flags = pebs->flags later on.

The PERF_EFLAGS_EXACT is a software flag using bit 3 of regs->flags.
X86 marks this bit as Reserved. To make sure this bit is zero before
we do any IP processing, we clear it explicitly.

Patch also removes the following assignment:

	regs->flags = pebs->flags | (regs->flags & PERF_EFLAGS_VM);

Because there is no regs->flags to preserve anymore because
set_linear_ip() is not called until later.

Signed-off-by: Stephane Eranian <eranian@google.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vince Weaver <vincent.weaver@maine.edu>
Cc: kan.liang@intel.com
Link: http://lkml.kernel.org/r/1522909791-32498-1-git-send-email-eranian@google.com
[ Improve capitalization, punctuation and clarity of comments. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
History 2018-04-05 09:28:40 +02:00
..
amd perf/x86/amd/power: Do not load AMD power module on !AMD platforms 2018-01-24 13:00:35 +01:00
intel perf/x86/intel: Move regs->flags EXACT bit init 2018-04-05 09:28:40 +02:00
core.c perf/x86: Update rdpmc_always_available static key to the modern API 2018-03-27 07:53:00 +02:00
Kconfig License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile perf/x86/events: Add an AMD-specific Makefile 2017-01-30 12:01:19 +01:00
msr.c x86/tsc: Get rid of rdtscll() 2018-03-23 20:07:54 +01:00
perf_event.h Merge branch 'perf/urgent' into perf/core, to pick up fixes 2018-03-24 09:21:47 +01:00