linux-kernel - Re: [x86] Build error at arch/x86/boot/bioscall.S

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Message-ID: <20090616081445.GB6270@cr0.nay.redhat.com>
Date:	Tue, 16 Jun 2009 16:14:45 +0800
From:	Amerigo Wang <xiyou.wangcong@...il.com>
To:	Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>
Cc:	hpa@...or.com, linux-kernel@...r.kernel.org
Subject: Re: [x86] Build error at arch/x86/boot/bioscall.S

On Tue, Jun 16, 2009 at 04:38:54PM +0900, Tetsuo Handa wrote:
>Hello.
>
>I tried to build 03347e2592078a90df818670fddf97a33eec70fb and got this error.
>
>(...snipped...)
>WARNING: modpost: Found 2 section mismatch(es).
>To see full details build your kernel with:
>'make CONFIG_DEBUG_SECTION_MISMATCH=y'
>/usr/src/all/linux/kernel/git/torvalds/linux-2.6.git/usr/include/linux/netfilter/xt_osf.h:40: found __[us]{8,16,32,64} type without #include <linux/types.h>
>/usr/src/all/linux/kernel/git/torvalds/linux-2.6.git/usr/include/mtd/jffs2-user.h:21: userspace cannot call function or variable defined in the kernel
>Documentation/accounting/getdelays.c: In function `main':
>Documentation/accounting/getdelays.c:249: warning: `cmd_type' might be used uninitialized in this function
>Documentation/spi/spidev_fdx.c: In function `do_msg':
>Documentation/spi/spidev_fdx.c:61: warning: cast from pointer to integer of different size
>Documentation/spi/spidev_fdx.c:64: warning: cast from pointer to integer of different size
>arch/x86/boot/bioscall.S: Assembler messages:
>arch/x86/boot/bioscall.S:68: Error: `68(%esp)' is not a valid 16 bit base/index expression

Huh?
16 bit mode doesn't allow 'esp' to be used as a base/index register?

How about:

- movw 68(%esp), %di
+ movzwl %sp, %ebx
+ movw 68(%ebx), %di

? Does this work?

Thanks.
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