linux-kernel - Re: linux-next-20090324: undefined reference to `__this_fixmap_does_not

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Message-ID: <49C9FFEA.7060908@cn.fujitsu.com>
Date:	Wed, 25 Mar 2009 17:56:58 +0800
From:	Wang Chen <wangchen@...fujitsu.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
CC:	mingo@...e.hu, linux-kernel@...r.kernel.org, sfr@...b.auug.org.au
Subject: Re: linux-next-20090324: undefined reference to `__this_fixmap_does_not_exist\'

Wang Chen said the following on 2009-3-25 16:52:
> Wang Chen said the following on 2009-3-25 12:58:
>> Tetsuo Handa said the following on 2009-3-25 11:24:
>>> Hello.
>>>
>>> I encountered below error.
>>>
>>> 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
>>>
>>> Config is at http://I-love.SAKURA.ne.jp/tmp/config-2.6.29-next-20090324
>>>
>> Tetsuo, I've tried the latest tip, it's OK.
>> I can't trigger the same problem as you do.
>> So I will try linux-next later.
>>
> 
> Tetsuo
> 
> I've "make" tested linux-next-20090324 with your config.
> Still can't trigger the error.
> It's strange :(
> 

Maybe we use different gcc versions.
Please try following patch.

From: Wang Chen <wangchen@...fujitsu.com>
Subject: [PATCH] use __fix_to_virt(), because we are sure it's safe

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 maybe failed on old gcc.

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

Signed-off-by: Wang Chen <wangchen@...fujitsu.com>
Reported-by: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
---
 ioremap.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- arch/x86/mm/ioremap.c.orig	2009-03-25 17:36:01.000000000 +0800
+++ arch/x86/mm/ioremap.c	2009-03-25 17:36:54.000000000 +0800
@@ -523,7 +523,7 @@ 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));
 	if (sizeof(bm_pte)) {

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