This is a note to let you know that I've just added the patch titled

perf probe: Return errno when not hitting any event

to the 4.9-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git%3Ba=su...

The filename of the patch is: perf-probe-return-errno-when-not-hitting-any-event.patch and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let stable@vger.kernel.org know about it.

From foo@baz Sun Mar 18 16:55:33 CET 2018

From: Kefeng Wang wangkefeng.wang@huawei.com Date: Fri, 17 Mar 2017 16:16:32 +0800 Subject: perf probe: Return errno when not hitting any event

From: Kefeng Wang wangkefeng.wang@huawei.com

[ Upstream commit 70946723eeb859466f026274b29c6196e39149c4 ]

On old perf, when using 'perf probe -d' to delete an inexistent event, it returns errno, eg,

-bash-4.3# perf probe -d xxx || echo $? Info: Event "*:xxx" does not exist. Error: Failed to delete events. 255

But now perf_del_probe_events() will always set ret = 0, different from previous del_perf_probe_events(). After this, it returns errno again, eg,

-bash-4.3# ./perf probe -d xxx || echo $? "xxx" does not hit any event. Error: Failed to delete events. 254

And it is more appropriate to return -ENOENT instead of -EPERM.

Signed-off-by: Kefeng Wang wangkefeng.wang@huawei.com Acked-by: Masami Hiramatsu mhiramat@kernel.org Cc: Hanjun Guo guohanjun@huawei.com Cc: Jiri Olsa jolsa@kernel.org Cc: Peter Zijlstra peterz@infradead.org Cc: Wang Nan wangnan0@huawei.com Fixes: dddc7ee32fa1 ("perf probe: Fix an error when deleting probes successfully") Link: http://lkml.kernel.org/r/1489738592-61011-1-git-send-email-wangkefeng.wang@h... Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin alexander.levin@microsoft.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- tools/perf/builtin-probe.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/tools/perf/builtin-probe.c +++ b/tools/perf/builtin-probe.c @@ -442,9 +442,9 @@ static int perf_del_probe_events(struct }

if (ret == -ENOENT && ret2 == -ENOENT) - pr_debug(""%s" does not hit any event.\n", str); - /* Note that this is silently ignored */ - ret = 0; + pr_warning(""%s" does not hit any event.\n", str); + else + ret = 0;

error: if (kfd >= 0)

Patches currently in stable-queue which might be from wangkefeng.wang@huawei.com are

queue-4.9/perf-probe-return-errno-when-not-hitting-any-event.patch