From: David Laight <David.Laight@ACULAB.COM>
To: 'Masami Hiramatsu' <mhiramat@kernel.org>,
Xiao Yang <yangx.jy@cn.fujitsu.com>
Cc: Steven Rostedt <rostedt@goodmis.org>,
Shuah Khan <shuah@kernel.org>,
"linux-kselftest@vger.kernel.org"
<linux-kselftest@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Tom Zanussi <tom.zanussi@linux.intel.com>,
Li Philip <philip.li@intel.com>,
Liu Yiding <yidingx.liu@intel.com>
Subject: RE: [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo
Date: Mon, 11 May 2020 10:34:55 +0000 [thread overview]
Message-ID: <a53a35607015496986678713cd1899e8@AcuMS.aculab.com> (raw)
In-Reply-To: <20200511182752.c83f3454bcb3e205cf2bda4a@kernel.org>
From: Masami Hiramatsu
> Sent: 11 May 2020 10:28
...
> > We may not avoid fixing related failures after your change:
> > 1) We have to reuse built-in echo (do alias echo=echo) if we want to
> > test common_pid for histogram.
> > 2) We have to reuse built-in echo if some new tests want to interpret
> > backslash escapes in future.
>
> 1) yes, that's what I need to do for avoiding "pid" key histogram
> (but I think we should have better way to test it)
> 2) No, in that case you should use "/bin/echo -e" explicitly.
> dash's built-in echo doesn't support it.
>
> > Is it simple to provide two implementations of echo?(built-in echo and
> > echo command?) and then just apply echo command for kprobe_syntax_errors.tc?
>
> Hmm, OK, there might be another reason we reconsider this patch.
>
> - Alisasing echo (this patch) can avoid dash related issues but
> this also makes "echo" running in another process implicitly.
>
> - Using /bin/echo for backslash explicitly will be missed unless
> user runs it on dash, but it will keep "echo" in same process.
Why not change to use printf - probably a builtin in both shells?
David
-
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next prev parent reply other threads:[~2020-05-11 10:35 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-01 13:37 [PATCH 0/3] selftests/ftrace: Fix ftracetest testcases for dash, etc Masami Hiramatsu
2020-05-01 13:37 ` [PATCH 1/3] selftests/ftrace: Make XFAIL green color Masami Hiramatsu
2020-05-01 14:15 ` Steven Rostedt
2020-05-01 13:37 ` [PATCH 2/3] selftests/ftrace: Pick only the first kprobe event to test Masami Hiramatsu
2020-05-01 14:17 ` Steven Rostedt
2020-05-01 15:38 ` shuah
2020-05-01 16:20 ` Steven Rostedt
2020-05-01 16:30 ` Shuah Khan
2020-05-02 3:05 ` Masami Hiramatsu
2020-05-01 13:38 ` [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo Masami Hiramatsu
2020-05-01 14:19 ` Steven Rostedt
2020-05-02 3:08 ` Masami Hiramatsu
2020-05-07 13:12 ` Steven Rostedt
2020-05-07 15:50 ` Masami Hiramatsu
2020-05-07 17:25 ` Steven Rostedt
2020-05-07 20:32 ` Zanussi, Tom
2020-05-08 7:11 ` Masami Hiramatsu
2020-05-07 6:45 ` Xiao Yang
2020-05-07 9:15 ` Masami Hiramatsu
2020-05-11 7:22 ` Xiao Yang
2020-05-11 9:27 ` Masami Hiramatsu
2020-05-11 10:34 ` David Laight [this message]
2020-05-11 12:01 ` [PATCH] selftests/ftrace: Use /bin/echo for backslash included command Masami Hiramatsu
2020-05-11 12:19 ` Andreas Schwab
2020-05-11 13:36 ` [PATCH v2] selftests/ftrace: Use printf " Masami Hiramatsu
2020-05-11 13:38 ` Masami Hiramatsu
2020-05-11 13:46 ` David Laight
2020-05-11 14:05 ` Masami Hiramatsu
2020-05-11 14:59 ` David Laight
2020-05-11 20:28 ` Steven Rostedt
2020-05-11 13:42 ` Andreas Schwab
2020-05-11 13:58 ` Masami Hiramatsu
2020-05-25 9:59 ` Masami Hiramatsu
2020-05-28 16:24 ` Shuah Khan
2020-05-07 9:22 ` [PATCH 3/3] selftests/ftrace: Use /bin/echo instead of built-in echo Andreas Schwab
2020-05-07 15:52 ` Masami Hiramatsu
2020-05-01 14:21 ` [PATCH 0/3] selftests/ftrace: Fix ftracetest testcases for dash, etc Steven Rostedt
2020-05-01 14:28 ` Shuah Khan
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