linux-kernel - Re: [PATCH] markup_oops: Use modinfo to avoid confusion with underscored module names

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Message-ID: <20090807014234.GA5047@cr0.nay.redhat.com>
Date:	Fri, 7 Aug 2009 09:42:34 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Ozan Çağlayan <ozan@...dus.org.tr>
Cc:	linux-kernel@...r.kernel.org, arjan@...radead.org
Subject: Re: [PATCH] markup_oops: Use modinfo to avoid confusion with
	underscored module names

On Thu, Aug 06, 2009 at 03:21:55PM +0300, Ozan Çağlayan wrote:
>When EIP is at a module having an underscore in its name, the current
>code fails to find it because the module filenames has '-' instead of
>'_'.
>
>Use modinfo to correctly get the full path to the module.
>
>Signed-off-by: Ozan Çağlayan <ozan@...dus.org.tr>
>---
>This is just a trivial patch to pinpoint the problem. Usage of modinfo is faster than
>searching through the filesystem but may not be desirable as it brings a dependency
>to module-init-tools. Replacing underscore occurences by '-' can be another solution.
>
> scripts/markup_oops.pl |    5 +----
> 1 files changed, 1 insertions(+), 4 deletions(-)
>
>diff --git a/scripts/markup_oops.pl b/scripts/markup_oops.pl
>index 8977401..bc14f4c 100644
>--- a/scripts/markup_oops.pl
>+++ b/scripts/markup_oops.pl
>@@ -184,10 +184,7 @@ if ($target eq "0") {
> 
> # if it's a module, we need to find the .ko file and calculate a load offset
> if ($module ne "") {
>-	my $dir = dirname($filename);
>-	$dir = $dir . "/";
>-	my $mod = $module . ".ko";
>-	my $modulefile = `find $dir -name $mod | head -1`;
>+	my $modulefile = `modinfo $module | grep 'filename' | gawk '{ print \$2 }'`;


I know this works, but how about grep '^filename:' ? This is more strict.

Also, although on most Linux awk is just a symbol link to gawk,
but it is still better to use awk instead of gawk for portability reason.


> 	chomp($modulefile);
> 	$filename = $modulefile;
> 	if ($filename eq "") {
--
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