linux-kernel - [tip:x86/mm] x86: early_ioremap_init(), use __fix_to

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Date:	Wed, 25 Mar 2009 13:09:29 GMT
From:	Wang Chen <wangchen@...fujitsu.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, wangchen@...fujitsu.com, mingo@...e.hu,
	penguin-kernel@...ove.sakura.ne.jp
Subject: [tip:x86/mm] x86: early_ioremap_init(), use __fix_to_virt(), because we are sure it's safe

Commit-ID:  9f4f25c86ff2233dd98d4bd6968afb1ca66558a0
Gitweb:     http://git.kernel.org/tip/9f4f25c86ff2233dd98d4bd6968afb1ca66558a0
Author:     Wang Chen <wangchen@...fujitsu.com>
AuthorDate: Wed, 25 Mar 2009 14:07:11 +0100
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Wed, 25 Mar 2009 14:07:11 +0100

x86: early_ioremap_init(), use __fix_to_virt(), because we are sure it's safe

Tetsuo Handa reported this link bug:

 |  arch/x86/mm/built-in.o(.init.text+0x1831): In function `early_ioremap_init':
 |  : undefined reference to `__this_fixmap_does_not_exist'
 |  make: *** [.tmp_vmlinux1] Error 1

Commit:8827247ffcc9e880cbe4705655065cf011265157 used a variable (which
would be optimized to constant) as fix_to_virt()'s parameter.
It's depended on gcc's optimization and fails on old gcc. (Tetsuo used gcc 3.3)

We can use __fix_to_vir() instead, because we know it's safe and
don't need link time error reporting.

Reported-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Signed-off-by: Wang Chen <wangchen@...fujitsu.com>
Cc: sfr@...b.auug.org.au
LKML-Reference: <49C9FFEA.7060908@...fujitsu.com>
Signed-off-by: Ingo Molnar <mingo@...e.hu>


---
 arch/x86/mm/ioremap.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/mm/ioremap.c b/arch/x86/mm/ioremap.c
index 83ed74a..0dfa09d 100644
--- a/arch/x86/mm/ioremap.c
+++ b/arch/x86/mm/ioremap.c
@@ -516,7 +516,7 @@ void __init early_ioremap_init(void)
 		printk(KERN_INFO "early_ioremap_init()\n");
 
 	for (i = 0; i < FIX_BTMAPS_SLOTS; i++)
-		slot_virt[i] = fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
+		slot_virt[i] = __fix_to_virt(FIX_BTMAP_BEGIN - NR_FIX_BTMAPS*i);
 
 	pmd = early_ioremap_pmd(fix_to_virt(FIX_BTMAP_BEGIN));
 	memset(bm_pte, 0, sizeof(bm_pte));
--
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