linux-kernel - Re: [Patch 1/2] kbuild: two trivial fixes for check headers

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Date:	Thu, 4 Jun 2009 17:56:23 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Sam Ravnborg <sam@...nborg.org>
Cc:	Amerigo Wang <amwang@...hat.com>, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, linux-kbuild@...r.kernel.org
Subject: Re: [Patch 1/2] kbuild: two trivial fixes for check headers

On Thu, Jun 04, 2009 at 11:15:19AM +0200, Sam Ravnborg wrote:
>On Thu, Jun 04, 2009 at 04:01:52AM -0400, Amerigo Wang wrote:
>> 
>> Remove a useless 'extern' in an exported header.
>> Fix a comment headers_check.pl.
>
>These two patches has nothing in commom.
>
>> 
>> Signed-off-by: WANG Cong <amwang@...hat.com>
>> Cc: Sam Ravnborg <sam@...nborg.org>
>> 
>> ------
>> diff --git a/include/mtd/jffs2-user.h b/include/mtd/jffs2-user.h
>> index fa94b0e..10dc7ef 100644
>> --- a/include/mtd/jffs2-user.h
>> +++ b/include/mtd/jffs2-user.h
>> @@ -18,7 +18,7 @@
>>  #undef je32_to_cpu
>>  #undef jemode_to_cpu
>>  
>> -extern int target_endian;
>> +int target_endian;
>
>You now declare a global variable named target_endian each time you include this file - which is wrong.

Hmmm, the script seems wrong, not the C code. :)
And the word 'prototype' is only for functions.

How about patch below?

Signed-off-by: WANG Cong <amwang@...hat.com>

---
diff --git a/scripts/headers_check.pl b/scripts/headers_check.pl
index 56f90a4..11dc869 100644
--- a/scripts/headers_check.pl
+++ b/scripts/headers_check.pl
@@ -2,7 +2,7 @@
 #
 # headers_check.pl execute a number of trivial consistency checks
 #
-# Usage: headers_check.pl dir [files...]
+# Usage: headers_check.pl dir arch [files...]
 # dir:   dir to look for included files
 # arch:  architecture
 # files: list of files to check
@@ -63,7 +63,7 @@ sub check_include
 
 sub check_prototypes
 {
-	if ($line =~ m/^\s*extern\b/) {
+	if ($line =~ m/^\s*extern\b.*\(.*\)/) {
 		printf STDERR "$filename:$lineno: extern's make no sense in userspace\n";
 	}
 }
--
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