linux-kernel - Re: how to look for source code in kernel

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Date:	Fri, 28 Dec 2012 23:38:28 +0100 (CET)
From:	Jesper Juhl <jj@...osbits.net>
To:	Guennadi Liakhovetski <g.liakhovetski@....de>
cc:	Borislav Petkov <bp@...en8.de>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	anish singh <anish198519851985@...il.com>,
	amit mehta <gmate.amit@...il.com>,
	Henrique Rodrigues <henriquesilvar@...il.com>,
	kishore kumar <kishoreopen@...il.com>,
	Jonathan Neuschäfer <j.neuschaefer@....net>,
	linux-kernel@...r.kernel.org, Kernelnewbies@...nelnewbies.org
Subject: Re: how to look for source code in kernel

On Fri, 28 Dec 2012, Guennadi Liakhovetski wrote:

> On Fri, 28 Dec 2012, Borislav Petkov wrote:
> 
> > On Thu, Dec 27, 2012 at 11:36:13PM -0800, Eric W. Biederman wrote:
> > > git-ls-files | xargs fgrep 'struct f2fs_inode'
> > > 
> > > That returns instantly and tells me where to look.  If you can do an
> > > instant brute force search what is the point of an index?
> > 
> > Not if you're using a lame-ass laptop with a rotating disk:
> > 
> > $ time git ls-files | xargs grep -E 'struct mce\W*{'
> > arch/x86/include/uapi/asm/mce.h:struct mce {
> > arch/x86/kernel/cpu/mcheck/mce.c:               if (!final || memcmp(m, final, sizeof(struct mce))) {
> > 
> > real    2m48.415s
> > user    0m2.388s
> > sys     0m15.668s
> > 
> > What I've grown accustomed to is cscope with a prior find run on the
> > kernel source tree to create a custom cscope.files which cscope uses to
> > index and then using vim bindings in cscope so that if, for example, the
> > cursor is on a function call, executing a keyboard shortcut opens the
> > definition of that function in another vim tab. I.e., a thin IDE done
> > right.
> 
> ...same works with TAGS under emacs, the only annoying problem with it 
> since "recently" (about half a year or more) is that "make TAGS" is 
> spewing out tons of
> 
> etags: Unmatched ( or \( while compiling pattern
> 
> oh well, looks like noone is using it / noone cares enough...
> 
I use it. I haven't bothered (yet) to look into the cause of the message 
it spews since the etags ('TAGS') file it produces still seems to work 
well enough.

-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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