linux-kernel - Re: [PATCH] perf: Fix interpretation of branch records

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Date:   Wed, 30 Nov 2022 10:35:03 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     James Clark <james.clark@....com>
Cc:     linux-perf-users@...r.kernel.org, acme@...nel.org,
        sandipan.das@....com, Anshuman.Khandual@....com,
        linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>
Subject: Re: [PATCH] perf: Fix interpretation of branch records

On Wed, Nov 30, 2022 at 8:52 AM James Clark <james.clark@....com> wrote:
>
> Commit 93315e46b000 ("perf/core: Add speculation info to branch
> entries") added a new field in between type and new_type. Perf has
> its own copy of this struct so update it to match the kernel side.
>
> This doesn't currently cause any issues because new_type is only used
> by the Arm BRBE driver which isn't merged yet.
>
> Fixes: 93315e46b000 ("perf/core: Add speculation info to branch entries")
> Signed-off-by: James Clark <james.clark@....com>

Acked-by: Namhyung Kim <namhyung@...nel.org>

Thanks,
Namhyung


> ---
>  tools/perf/util/branch.h | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/tools/perf/util/branch.h b/tools/perf/util/branch.h
> index d6017c9b1872..3ed792db1125 100644
> --- a/tools/perf/util/branch.h
> +++ b/tools/perf/util/branch.h
> @@ -22,9 +22,10 @@ struct branch_flags {
>                         u64 abort:1;
>                         u64 cycles:16;
>                         u64 type:4;
> +                       u64 spec:2;
>                         u64 new_type:4;
>                         u64 priv:3;
> -                       u64 reserved:33;
> +                       u64 reserved:31;
>                 };
>         };
>  };
> --
> 2.25.1
>