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

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Message-ID: <Pine.LNX.4.64.1212282321370.2539@axis700.grange>
Date:	Fri, 28 Dec 2012 23:23:34 +0100 (CET)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Borislav Petkov <bp@...en8.de>
cc:	"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, 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...

Thanks
Guennadi

> 
> > My experience with gui editors is that they always hide something I
> > need to see, or my code is just strange enough (say having asm file,
> > or supporting multiple architectures) that the tools get horribly
> > confused.
> 
> That's true, then I tend to use another xterm with tabbed vim showing
> additional files. Btw, git ls-files assumes a source file is tracked by
> git and in the seldom case where you're adding new, yet untracked files,
> that won't work.
> 
> So probably a mixed approach of cscope in one window and grep + editor
> in another would cover all bases. For a newbie who wants to only browse
> the code, cscope should be enough for starters, I'd say.
> 
> Thanks.
> 
> -- 
> Regards/Gruss,
> Boris.
> --
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---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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