linux-kernel - Re: [PATCH 1/2] namespace.pl: fix source tree name mangling

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Message-ID: <20100929093411.GF5169@cr0.nay.redhat.com>
Date:	Wed, 29 Sep 2010 17:34:11 +0800
From:	Américo Wang <xiyou.wangcong@...il.com>
To:	Stephen Hemminger <stephen.hemminger@...tta.com>
Cc:	Américo Wang <xiyou.wangcong@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Michal Marek <mmarek@...e.cz>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] namespace.pl: fix source tree name mangling

On Wed, Sep 29, 2010 at 12:14:58AM -0700, Stephen Hemminger wrote:
>
>
>----- Original Message -----
>> On Wed, Sep 29, 2010 at 03:06:45PM +0900, Stephen Hemminger wrote:
>> >On Wed, 29 Sep 2010 14:04:27 +0800
>> >Américo Wang <xiyou.wangcong@...il.com> wrote:
>> >
>> >> On Wed, Sep 29, 2010 at 02:11:53PM +0900, Stephen Hemminger wrote:
>> >> >On Wed, 29 Sep 2010 12:31:12 +0800
>> >> >Américo Wang <xiyou.wangcong@...il.com> wrote:
>> >> >
>> >> >> On Tue, Sep 28, 2010 at 05:44:02PM +0900, Stephen Hemminger
>> >> >> wrote:
>> >> >> >The current namespace.pl script does not find source files
>> >> >> >correctly. The problem is that the current directory is not the
>> >> >> >base of the kernel
>> >> >> >tree at the point where it calls objdump.
>> >> >> >
>> >> >> >Signed-off-by: Stephen Hemminger <shemminger@...tta.com>
>> >> >> >
>> >> >> >--- a/scripts/namespace.pl 2010-09-27 17:53:29.919433444 +0900
>> >> >> >+++ b/scripts/namespace.pl 2010-09-28 09:24:36.891552993 +0900
>> >> >> >@@ -167,8 +167,10 @@ sub do_nm
>> >> >> > 		printf STDERR "$fullname is not an object file\n";
>> >> >> > 		return;
>> >> >> > 	}
>> >> >> >- ($source = $fullname) =~ s/\.o$//;
>> >> >> >- if (-e "$objtree$source.c" || -e "$objtree$source.S") {
>> >> >> >+ $fullname =~ s/\.o$//;
>> >> >> >+ $source = $basename;
>> >> >> >+ $source =~ s/\.o$//;
>> >> >>
>> >> >> With your patch applied, $source will be the basename of
>> >> >> an obj path with .o stripped.
>> >> >>
>> >> >> >+ if (-e "$objtree$fullname.c" || -e "$objtree$fullname.S") {
>> >> >> > 		$source = "$objtree$source";
>> >> >> > 	} else {
>> >> >> > 		$source = "$srctree$source";
>> >> >> >
>> >> >>
>> >> >> So here we will get a non-exist path stored in $source.
>> >> >>
>> ...
>> >>
>> >> I see, the docs of Find module said it will do chdir. :)
>> >> But I think your patch is still not right, how about the
>> >> one below?
>> >
>> >Please be more precise about "not right"? It makes the code
>> >work.
>> >
>> 
>> Hmm? $srctree is the path of top source code, and $source
>> is the basename of an object, so dirname is missed, no?
>
>No. it works, please stop speculating and use a debugger or demonstrate
>what you think the problem is.
>

Just add a print to see what $source is, after you patch applied,
I got something like:

===>/home/wangcong/linux-2.6/btusb

I can't see any reason that this is correct. Maybe it works, but
probably by accident.

Thanks.

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