linux-kernel - [PATCH 0/2] perf/hw_breakpoint: Fix breakpoint modify

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Date:   Mon,  6 Aug 2018 12:12:39 +0200
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Milind Chabbi <chabbi.milind@...il.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: [PATCH 0/2] perf/hw_breakpoint: Fix breakpoint modify

hi,
Milind reported that modify_user_hw_breakpoint wouldn't
allow the breakpoint changing if the new attr had 'disabled'
set to true.

I found a case where it actualy prevents ptrace user interface
to change the breakpoint. It's described in patch 1 as perf test,
patch 2 is the breakpoint code fix.

I ran strace tests, nothing (new) broken there..

thanks,
jirka


---
Jiri Olsa (2):
      perf tests: Add breakpoint modify test
      perf/hw_breakpoint: Modify breakpoint even if the new attr has disabled set

 kernel/events/hw_breakpoint.c            |  10 ++++++----
 tools/perf/arch/x86/include/arch-tests.h |   1 +
 tools/perf/arch/x86/tests/Build          |   1 +
 tools/perf/arch/x86/tests/arch-tests.c   |   6 ++++++
 tools/perf/arch/x86/tests/bp-modify.c    | 119 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 5 files changed, 133 insertions(+), 4 deletions(-)
 create mode 100644 tools/perf/arch/x86/tests/bp-modify.c