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

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Message-ID: <20180814103208.GB7268@redhat.com>
Date:   Tue, 14 Aug 2018 12:32:09 +0200
From:   Oleg Nesterov <oleg@...hat.com>
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>,
        Frederic Weisbecker <frederic@...nel.org>
Subject: Re: [PATCH 4/5] perf/hw_breakpoint: Enable breakpoint in
 modify_user_hw_breakpoint

On 08/10, Jiri Olsa wrote:
>
> --- a/kernel/events/hw_breakpoint.c
> +++ b/kernel/events/hw_breakpoint.c
> @@ -523,13 +523,11 @@ int modify_user_hw_breakpoint(struct perf_event *bp, struct perf_event_attr *att
>  		perf_event_disable(bp);
>  
>  	err = modify_user_hw_breakpoint_check(bp, attr, false);
> -	if (err)
> -		return err;
>  
> -	if (!attr->disabled)
> +	if (!bp->attr.disabled)
>  		perf_event_enable(bp);
>  
> -	return 0;
> +	return err;
>  }

Acked-by: Oleg Nesterov <oleg@...hat.com>