This is a note to let you know that I've just added the patch titled
perf record: Fix cpu mask bit setting for mixed mmaps
to the 5.19-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-record-fix-cpu-mask-bit-setting-for-mixed-mmaps.patch
and it can be found in the queue-5.19 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 57224444030ba3d24e26a125231d5b7c56fb0bd8
Author: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Thu Sep 15 15:26:11 2022 +0300
perf record: Fix cpu mask bit setting for mixed mmaps
[ Upstream commit ca76d7d2812b46124291f99c9b50aaf63a936f23 ]
With mixed per-thread and (system-wide) per-cpu maps, the "any cpu" value
-1 must be skipped when setting CPU mask bits.
Prior to commit cbd7bfc7fd99acdd ("tools/perf: Fix out of bound access
to cpu mask array") the invalid setting went unnoticed, but since then
it causes perf record to fail with an error.
Example:
Before:
$ perf record -e intel_pt// --per-thread uname
Failed to initialize parallel data streaming masks
After:
$ perf record -e intel_pt// --per-thread uname
Linux
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.068 MB perf.data ]
Fixes: ae4f8ae16a078964 ("libperf evlist: Allow mixing per-thread and per-cpu mmaps")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Acked-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Athira Rajeev <atrajeev@xxxxxxxxxxxxxxxxxx>
Cc: Ian Rogers <irogers@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20220915122612.81738-2-adrian.hunter@xxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 708880a1c83c..7fbc85c1da81 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -3344,6 +3344,8 @@ static int record__mmap_cpu_mask_init(struct mmap_cpu_mask *mask, struct perf_cp
return 0;
perf_cpu_map__for_each_cpu(cpu, idx, cpus) {
+ if (cpu.cpu == -1)
+ continue;
/* Return ENODEV is input cpu is greater than max cpu */
if ((unsigned long)cpu.cpu > mask->nbits)
return -ENODEV;
