Messages in this thread Patch in this message | | | From | Denys Vlasenko <> | Subject | [PATCH 2/4] perf/x86_64: get_regs_user: Do report user_regs->cx while we are in syscall | Date | Fri, 10 Apr 2015 15:06:57 +0200 |
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Yes, it is true that cx contains return address. It's not clear why we trash it. Stop doing that.
Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com> CC: Jiri Olsa <jolsa@redhat.com> CC: Peter Zijlstra <a.p.zijlstra@chello.nl> CC: Paul Mackerras <paulus@samba.org> CC: Ingo Molnar <mingo@redhat.com> CC: Arnaldo Carvalho de Melo <acme@kernel.org> CC: x86@kernel.org CC: linux-kernel@vger.kernel.org --- arch/x86/kernel/perf_regs.c | 2 -- 1 file changed, 2 deletions(-)
diff --git a/arch/x86/kernel/perf_regs.c b/arch/x86/kernel/perf_regs.c index 7ab198a..a8d4e48 100644 --- a/arch/x86/kernel/perf_regs.c +++ b/arch/x86/kernel/perf_regs.c @@ -177,8 +177,6 @@ void perf_get_regs_user(struct perf_regs *regs_user, * than just blindly copying user_regs. */ regs_user->abi = PERF_SAMPLE_REGS_ABI_64; - /* usually contains return address (same as ->ip) */ - regs_user_copy->cx = -1; } else { /* We're probably in an interrupt or exception. */ regs_user->abi = user_64bit_mode(user_regs) ? -- 1.8.1.4
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