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

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Date:   Mon, 21 Sep 2020 21:46:37 +0100
From:   Al Grant <al.grant@...s.arm.com>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH] perf: correct SNOOPX field offset

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.

Fixes: 52839e653b5629bd ("perf tools: Add support for printing new 
mem_info encodings")
Signed-off-by: Al Grant <al.grant@...s.arm.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
---
  include/uapi/linux/perf_event.h | 2 +-
  1 file changed, 1 insertion(+), 1 deletion(-)

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 */