linux-kernel - Re: [PATCH] fix build error when CONFIG

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Date:	Mon, 24 Jan 2011 22:33:47 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Sam Ravnborg <sam@...nborg.org>,
	Sergei Shtylyov <sshtylyov@...sta.com>,
	Yoichi Yuasa <yuasa@...ux-mips.org>,
	linux-mips <linux-mips@...ux-mips.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fix build error when CONFIG_SWAP is not set

On Tue, 25 Jan 2011 07:24:09 +0100 Geert Uytterhoeven <geert@...ux-m68k.org> wrote:

> > I just checked.
> > sparc32 with a defconfig barfed out like this:
> > __CC __ __ __arch/sparc/kernel/traps_32.o
> > In file included from /home/sam/kernel/linux-2.6.git/include/linux/pagemap.h:7:0,
> > __ __ __ __ __ __ __ __ from /home/sam/kernel/linux-2.6.git/include/linux/swap.h:11,
> > __ __ __ __ __ __ __ __ from /home/sam/kernel/linux-2.6.git/arch/sparc/include/asm/pgtable_32.h:15,
> > __ __ __ __ __ __ __ __ from /home/sam/kernel/linux-2.6.git/arch/sparc/include/asm/pgtable.h:6,
> > __ __ __ __ __ __ __ __ from /home/sam/kernel/linux-2.6.git/arch/sparc/kernel/traps_32.c:23:
> > /home/sam/kernel/linux-2.6.git/include/linux/mm.h: In function 'is_vmalloc_addr':
> > /home/sam/kernel/linux-2.6.git/include/linux/mm.h:301:17: error: 'VMALLOC_START' undeclared (first use in this function)
> > /home/sam/kernel/linux-2.6.git/include/linux/mm.h:301:17: note: each undeclared identifier is reported only once for each function it appears in
> > /home/sam/kernel/linux-2.6.git/include/linux/mm.h:301:41: error: 'VMALLOC_END' undeclared (first use in this function)
> > /home/sam/kernel/linux-2.6.git/include/linux/mm.h: In function 'maybe_mkwrite':
> > /home/sam/kernel/linux-2.6.git/include/linux/mm.h:483:3: error: implicit declaration of function 'pte_mkwrite'
> >
> > When I removed the include it could build again.
> 
> ... and so it is. Good to know, thanks for checking!

meanwhile I suppose someone should fix the error ;)


From: Andrew Morton <akpm@...ux-foundation.org>

mips:

In file included from arch/mips/include/asm/tlb.h:21,
                 from mm/pgtable-generic.c:9:
include/asm-generic/tlb.h: In function `tlb_flush_mmu':
include/asm-generic/tlb.h:76: error: implicit declaration of function `release_pages'
include/asm-generic/tlb.h: In function `tlb_remove_page':
include/asm-generic/tlb.h:105: error: implicit declaration of function `page_cache_release'

free_pages_and_swap_cache() and free_page_and_swap_cache() are macros
which call release_pages() and page_cache_release().  The obvious fix is
to include pagemap.h in swap.h, where those macros are defined.  But that
breaks sparc for weird reasons.

So fix it within mm/pgtable-generic.c instead.

Reported-by: Yoichi Yuasa <yuasa@...ux-mips.org>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Sam Ravnborg <sam@...nborg.org>
Cc: Sergei Shtylyov <sshtylyov@...sta.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 mm/pgtable-generic.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN mm/pgtable-generic.c~mm-pgtable-genericc-fix-config_swap=n-build mm/pgtable-generic.c
--- a/mm/pgtable-generic.c~mm-pgtable-genericc-fix-config_swap=n-build
+++ a/mm/pgtable-generic.c
@@ -6,6 +6,7 @@
  *  Copyright (C) 2010  Linus Torvalds
  */
 
+#include <linux/pagemap.h>
 #include <asm/tlb.h>
 #include <asm-generic/pgtable.h>
 
_

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