linux-kernel - Re: [PATCHv4 0/5] perf/hw_breakpoint: Fix breakpoint modify

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Date:   Thu, 30 Aug 2018 15:39:05 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        lkml <linux-kernel@...r.kernel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Milind Chabbi <chabbi.milind@...il.com>,
        Oleg Nesterov <oleg@...hat.com>
Subject: Re: [PATCHv4 0/5] perf/hw_breakpoint: Fix breakpoint modify

Em Mon, Aug 27, 2018 at 11:12:23AM +0200, Jiri Olsa escreveu:
> 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, tested and applied.

- Arnaldo