linux-kernel - Re: [PATCH] kbuild: Fix output of make kernelrelease

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Date:	Thu, 23 Oct 2014 10:57:57 +0200
From:	Michal Marek <mmarek@...e.cz>
To:	Steven Rostedt <rostedt@...dmis.org>
CC:	LKML <linux-kernel@...r.kernel.org>,
	Masahiro Yamada <yamada.m@...panasonic.com>,
	Peter Foley <pefoley2@...oley.com>,
	linux-kbuild@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH] kbuild: Fix output of make kernelrelease

On 2014-10-23 03:11, Steven Rostedt wrote:
> On Wed, 22 Oct 2014 21:44:08 +0200
> Michal Marek <mmarek@...e.cz> wrote:
> 
>> Dne 22.10.2014 v 16:19 Steven Rostedt napsal(a):
>>>
>>> Commit 7ff525712acf "kbuild: fake the "Entering directory ..." message
>>> more simply" changed the output of "make kernelrelease" such that the
>>> kernel release version was not the last line printed. This broke various
>>> tools that would find the kernel release with "make kernelrelease | tail -1".
>>
>> The cleaner and recommended (see recent make help) way is to use make -s:
>>
>> $ make O=build -s kernelrelease
>> 3.18.0-rc1+
>>
>> no further processing is needed.
> 
> 
> I don't mind changing my script with your patch. But this does break
> other scripts of mine that I need to hunt down and change. My fear is
> why do we need the '-s' when there may be other methods to preserve the
> old functionality.

If you have scripts that only do x=$(make kernelrelease), then you
should definitely fix them. You are right that the make kernelrelease |
tail -1 trick had always been working until 7ff525712acf, so I can apply
your patch. But please fix ktest.pl so that it's consistent with what
the help text says. Also, the Makefile patch should cover kernelversion
and image_name as well.

Michal
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