linux-kernel - [PATCH] 2.6.23-rc2 error compiling fs/drop_caches.c (struct super

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Date:	Sat, 11 Aug 2007 13:53:56 -0400
From:	Erez Zadok <ezk@...sunysb.edu>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:	viro@...iv.linux.org.uk
Subject: [PATCH] 2.6.23-rc2 error compiling fs/drop_caches.c (struct super_block errors)

I'm getting a lot of warnings about struct super_block in 2.6.23-rc2.  Then,
a compile error when compiling fs/drop_caches.o:

  CC      fs/drop_caches.o
In file included from fs/drop_caches.c:7:
include/linux/mm.h:1210: warning: 'struct super_block' declared inside parameter list
include/linux/mm.h:1210: warning: its scope is only this definition or declaration, which is probably not what you want
fs/drop_caches.c:17: error: conflicting types for 'drop_pagecache_sb'
include/linux/mm.h:1210: error: previous declaration of 'drop_pagecache_sb' was here
fs/drop_caches.c:28: error: conflicting types for 'drop_pagecache_sb'
include/linux/mm.h:1210: error: previous declaration of 'drop_pagecache_sb' was here
make[1]: *** [fs/drop_caches.o] Error 1
make: *** [fs] Error 2

I'm using Linus's tree, which is 2.6.23-rc2 plus all patches up to this
commit:

  commit ac07860264bd2b18834d3fa3be47032115524cea
  Author: Jesper Juhl <jesper.juhl@...il.com>
  Date:   Wed Aug 8 16:31:30 2007 -0700

I didn't check if this is fixed already in the latest -mm.  The following
small fix seems to get rid of all warnings and compile errors I've seen:


diff --git a/include/linux/mm.h b/include/linux/mm.h
index 324c151..ed90191 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -20,6 +20,7 @@ struct anon_vma;
 struct file_ra_state;
 struct user_struct;
 struct writeback_control;
+struct super_block;
 
 #ifndef CONFIG_DISCONTIGMEM          /* Don't use mapnrs, do it properly */
 extern unsigned long max_mapnr;


Cheers,
Erez.
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