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

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Message-Id: <20080609120954.7d41a5bf.akpm@linux-foundation.org>
Date:	Mon, 9 Jun 2008 12:09:54 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Peter Oberparleiter <peter.oberparleiter@...ibm.com>
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

On Mon, 09 Jun 2008 15:49:16 +0200 Peter Oberparleiter <peter.oberparleiter@...ibm.com> wrote:

> 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.

It doesn't seem awfully useful.  I don't run kernels on my build
machines and I'm sure many are in the same situation.  So gcov is going
to need a way of locating these files on the *target* machine.  And
once that is available, there is no need to add all these symlinks into
the build directory.

> > 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..

I use

	ctags -R --excmd=pattern --format=1

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