linux-kernel - Re: [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in modify_user_hw

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Message-ID: <20180817145007.GD12426@lerouge>
Date:   Fri, 17 Aug 2018 16:50:08 +0200
From:   Frederic Weisbecker <frederic@...nel.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        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>
Subject: Re: [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in
 modify_user_hw_breakpoint

On Fri, Aug 10, 2018 at 12:47:29PM +0200, Jiri Olsa wrote:
> Currently we enable the breakpoint back only if the breakpoint
> modification was successful. If it fails we can leave the
> breakpoint in disabled state with attr->disabled == 0.
> 
> We can safely enable the breakpoint back for both the fail
> and success paths by checking the bp->attr.disabled, which
> either holds the new 'requested' disabled state or the
> original breakpoint state.
> 
> Suggested-by: Oleg Nesterov <oleg@...hat.com>
> Link: http://lkml.kernel.org/n/tip-79p9ttocwy2ju2s6qh25dvre@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>

Acked-by: Frederic Weisbecker <frederic@...nel.org>

Thanks a lot!