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7c41d8c1bc
[ Upstream commit c6aab66a728b6518772c74bd9dff66e1a1c652fd ]
Since the commit 6a13a0d7b4d1 ("ftrace/kprobe: Show the maxactive number
on kprobe_events") introduced to show the instance number of kretprobe
events, the length of the 1st format of the kprobe event will not 1, but
it can be longer. This caused a parser error in perf-probe.
Skip the length check the 1st format of the kprobe event to accept this
instance number.
Without this fix:
# perf probe -a vfs_read%return
Added new event:
probe:vfs_read__return (on vfs_read%return)
You can now use it in all perf tools, such as:
perf record -e probe:vfs_read__return -aR sleep 1
# perf probe -l
Semantic error :Failed to parse event name: r16:probe/vfs_read__return
Error: Failed to show event list.
And with this fixes:
# perf probe -a vfs_read%return
...
# perf probe -l
probe:vfs_read__return (on vfs_read%return)
Fixes: 6a13a0d7b4d1 ("ftrace/kprobe: Show the maxactive number on kprobe_events")
Reported-by: Yuxuan Shui <yshuiv7@gmail.com>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Tested-by: Yuxuan Shui <yshuiv7@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: stable@vger.kernel.org
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207587
Link: http://lore.kernel.org/lkml/158877535215.26469.1113127926699134067.stgit@devnote2
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.