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H A D | ds.c | d1e7e602 Thu Apr 05 01:29:51 CDT 2018 Stephane Eranian <eranian@google.com> perf/x86/intel: Move regs->flags EXACT bit init
This patch removes a redundant store on regs->flags introduced by commit:
71eb9ee9596d ("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>
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