linux-kernel - Re: [PATCH] perf: correct SNOOPX field offset

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Message-ID: <20200826112435.GA43491@C02TD0UTHF1T.local>
Date:   Wed, 26 Aug 2020 12:24:35 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Al Grant <al.grant@...s.arm.com>
Cc:     linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, acme@...hat.com,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: Re: [PATCH] perf: correct SNOOPX field offset

Hi,

[ adding the kernel-side perf maintainers ]

Please note that scripts/get_maintainer.pl can help to find relevant
maintainers.

On Mon, Aug 24, 2020 at 10:28:34AM +0100, Al Grant wrote:
> perf_event.h has macros that define the field offsets in the
> data_src bitmask in perf records. The SNOOPX and REMOTE offsets
> were both 37. These are distinct fields, and the bitfield layout
> in perf_mem_data_src confirms that SNOOPX should be at offset 38.
>
> From: Al Grant <al.grant@....com>

This needs a Signed-off-by line from you. See:

https://www.kernel.org/doc/html/latest/process/submitting-patches.html#sign-your-work-the-developer-s-certificate-of-origin

The patch itself looks right to me, so provided you add an S-o-B line:

Acked-by: Mark Rutland <mark.rutland@....com>

Mark

> 
>  include/uapi/linux/perf_event.h       | 2 +-
>  tools/include/uapi/linux/perf_event.h | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/include/uapi/linux/perf_event.h
> b/include/uapi/linux/perf_event.h
> index 077e7ee69e3d..3e5dcdd48a49 100644
> --- a/include/uapi/linux/perf_event.h
> +++ b/include/uapi/linux/perf_event.h
> @@ -1196,7 +1196,7 @@ union perf_mem_data_src {
> 
>  #define PERF_MEM_SNOOPX_FWD    0x01 /* forward */
>  /* 1 free */
> -#define PERF_MEM_SNOOPX_SHIFT  37
> +#define PERF_MEM_SNOOPX_SHIFT  38
> 
>  /* locked instruction */
>  #define PERF_MEM_LOCK_NA       0x01 /* not available */
> diff --git a/tools/include/uapi/linux/perf_event.h
> b/tools/include/uapi/linux/perf_event.h
> index 077e7ee69e3d..3e5dcdd48a49 100644
> --- a/tools/include/uapi/linux/perf_event.h
> +++ b/tools/include/uapi/linux/perf_event.h
> @@ -1196,7 +1196,7 @@ union perf_mem_data_src {
> 
>  #define PERF_MEM_SNOOPX_FWD    0x01 /* forward */
>  /* 1 free */
> -#define PERF_MEM_SNOOPX_SHIFT  37
> +#define PERF_MEM_SNOOPX_SHIFT  38
> 
>  /* locked instruction */
>  #define PERF_MEM_LOCK_NA       0x01 /* not available */