linux-kernel - Re: [PATCH] mm: dump page when hitting a VM_BUG_ON using VM_BUG_ON

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Date:	Mon, 30 Dec 2013 12:48:54 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	akpm@...ux-foundation.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: dump page when hitting a VM_BUG_ON using
 VM_BUG_ON_PAGE fix

On Fri, Dec 27, 2013 at 05:40:18PM -0500, Sasha Levin wrote:
> I messed up and forgot to commit this fix before sending out the original
> patch.
> 
> It fixes build issues in various files using VM_BUG_ON_PAGE.

With the patch applied I see this:

  CC      kernel/bounds.s
In file included from /home/space/kas/git/public/linux-next/include/linux/page-flags.h:10:0,
                 from /home/space/kas/git/public/linux-next/kernel/bounds.c:9:
/home/space/kas/git/public/linux-next/include/linux/mmdebug.h:5:30: warning: ‘struct page’ declared inside parameter list [enabled by default]
 extern void dump_page(struct page *page);
                              ^
/home/space/kas/git/public/linux-next/include/linux/mmdebug.h:5:30: warning: its scope is only this definition or declaration, which is probably not what you want [enabled by default]

We need to declare struct page here as well.

diff --git a/include/linux/mmdebug.h b/include/linux/mmdebug.h
index 8bb64900da25..e8cec8bdda05 100644
--- a/include/linux/mmdebug.h
+++ b/include/linux/mmdebug.h
@@ -2,6 +2,7 @@
 #define LINUX_MM_DEBUG_H 1
 
 #ifdef CONFIG_DEBUG_VM
+struct page;
 extern void dump_page(struct page *page);
 #define VM_BUG_ON(cond) BUG_ON(cond)
 #define VM_BUG_ON_PAGE(cond, page) \
-- 
 Kirill A. Shutemov
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