linux-kernel - [PATCH 07/12] perf: Update PERF_RECORD_MISC_* comment for perf_event

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Date:   Sun,  7 Jan 2018 17:03:51 +0100
From:   Jiri Olsa <jolsa@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:     lkml <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        David Ahern <dsahern@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: [PATCH 07/12] perf: Update PERF_RECORD_MISC_* comment for perf_event_header::misc bit 13

The perf_event_header::misc bit 13 is shared on different
events and next patch is adding yet another bit 13 user.
Updating the comment to make it more structured and clear
which events use bit 13.

Suggested-by: Peter Zijlstra <peterz@...radead.org>
Link: http://lkml.kernel.org/n/tip-yhpr7l42xo6ew4xye6a189ez@git.kernel.org
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 include/uapi/linux/perf_event.h | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/include/uapi/linux/perf_event.h b/include/uapi/linux/perf_event.h
index 8bb66e8da945..c77c9a2ebbbb 100644
--- a/include/uapi/linux/perf_event.h
+++ b/include/uapi/linux/perf_event.h
@@ -612,9 +612,12 @@ struct perf_event_mmap_page {
  */
 #define PERF_RECORD_MISC_PROC_MAP_PARSE_TIMEOUT	(1 << 12)
 /*
- * PERF_RECORD_MISC_MMAP_DATA and PERF_RECORD_MISC_COMM_EXEC are used on
- * different events so can reuse the same bit position.
- * Ditto PERF_RECORD_MISC_SWITCH_OUT.
+ * Following PERF_RECORD_MISC_* are used on different
+ * events, so can reuse the same bit position:
+ *
+ *   PERF_RECORD_MISC_MMAP_DATA  - PERF_RECORD_MMAP* events
+ *   PERF_RECORD_MISC_COMM_EXEC  - PERF_RECORD_COMM event
+ *   PERF_RECORD_MISC_SWITCH_OUT - PERF_RECORD_SWITCH* events
  */
 #define PERF_RECORD_MISC_MMAP_DATA		(1 << 13)
 #define PERF_RECORD_MISC_COMM_EXEC		(1 << 13)
-- 
2.13.6