linux-kernel - Re: [PATCH 0/6] gcov kernel support

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Date:	Mon, 09 Jun 2008 15:49:16 +0200
From:	Peter Oberparleiter <peter.oberparleiter@...ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Peter Oberparleiter <oberparleiter@...glemail.com>,
	linux-kernel@...r.kernel.org, ltp-coverage@...ts.sourceforge.net,
	Sam Ravnborg <sam@...nborg.org>
Subject: Re: [PATCH 0/6] gcov kernel support

Andrew Morton wrote:
> On Mon, 02 Jun 2008 15:33:51 +0200 Peter Oberparleiter <peter.oberparleiter@...ibm.com> wrote:
> 
>> This is version #3 of the gcov kernel support patch set 
> 
> My build tree is now filled with dead symlinks, like
> 
> lrwxrwxrwx 1 akpm akpm 64 Jun  9 00:06 security/selinux/nlmsgtab.gcda -> /sys/kernel/debug/gcov/usr/src/25/security/selinux/nlmsgtab.gcda

Unfortunately a necessary evil of this approach: symlinks are created
for all compiled source files while link targets are only available when
the corresponding code is executed. In other words: those links will be
dead for source files which don't compile to actual code and for modules
as long as they are not loaded.

> Which causes (at least)
> 
> ctags: Warning: cannot open source file "security/selinux/ss/conditional.gcda" : No such file or directory
> ctags: Warning: cannot open source file "security/selinux/netlink.gcda" : No such file or directory
> ctags: Warning: cannot open source file "security/selinux/netlabel.gcda" : No such file or directory

> and probably other thing which I haven't discovered yet.

I'm sure there's some kind of 'find' magic that can be used to work
around dead links. I'll see how this can be applied to the ctags case -
though neither 'make tags' nor 'make TAGS' seem to produce any warnings
on my system..


Regards,
  Peter
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