linux-kernel - Re: [PATCH -tip] bpf: Check flags for branch stack in bpf_read_branch

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Message-ID: <YzNhFKj7UoGcc5ky@hirez.programming.kicks-ass.net>
Date:   Tue, 27 Sep 2022 22:46:12 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Jiri Olsa <jolsa@...nel.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Kan Liang <kan.liang@...ux.intel.com>,
        lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Mark Rutland <mark.rutland@....com>,
        Namhyung Kim <namhyung@...nel.org>, bpf@...r.kernel.org,
        Song Liu <songliubraving@...com>, Daniel Xu <dxu@...uu.xyz>
Subject: Re: [PATCH -tip] bpf: Check flags for branch stack in
 bpf_read_branch_records helper

On Tue, Sep 27, 2022 at 10:32:59PM +0200, Jiri Olsa wrote:
> Recent commit [1] changed branch stack data indication from
> br_stack pointer to sample_flags in perf_sample_data struct.
> 
> We need to check sample_flags for PERF_SAMPLE_BRANCH_STACK
> bit for valid branch stack data.
> 
> [1] a9a931e26668 ("perf: Use sample_flags for branch stack")
> 
> Cc: Kan Liang <kan.liang@...ux.intel.com>
> Fixes: a9a931e26668 ("perf: Use sample_flags for branch stack")
> Signed-off-by: Jiri Olsa <jolsa@...nel.org>
> ---
> NOTE sending on top of tip/master because [1] is not
>      merged in bpf-next/master yet

Shall I stick this in tip/perf/core right along with [1] then?