linux-kernel - Re: [uml-devel] [Patch] uml: fix a link error

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Date:	Thu, 12 Feb 2009 15:40:23 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
cc:	Greg KH <gregkh@...e.de>, Shane Hathaway <shane@...hawaymix.org>,
	Daolong Wang <ahlongxp@...il.com>,
	User-mode Linux Kernel Development 
	<user-mode-linux-devel@...ts.sourceforge.net>,
	Jeff Dike <jdike@...toit.com>,
	Linux Kernel Development <linux-kernel@...r.kernel.org>,
	Rob Landley <rob@...dley.net>,
	Am?rico Wang <xiyou.wangcong@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	Al Viro <viro@...IV.linux.org.uk>
Subject: Re: [uml-devel] [Patch] uml: fix a link error

On Sat, 7 Feb 2009, Heiko Carstens wrote:
> On Wed, 4 Feb 2009 21:54:12 +0100 (CET)
> Geert Uytterhoeven <geert@...ux-m68k.org> wrote:
> > I verified that Shane's solution:
> > 
> > #define sys_sigprocmask sys_kernel_sigprocmask
> > 
> > works for me, but that's definitely not the cleanest way.
> > 
> > Al Viro also had a suggestion to rework the SYSCALL_DEFINE* macros, but I
> > haven't tried it yet.
> 
> 
> Patch below should fix it.

Thanks! I only managed to try it a few minutes ago...

> Subject: [PATCH] syscall define: fix uml compile bug
> 
> From: Heiko Carstens <heiko.carstens@...ibm.com>
> 
> With the new system call defines we get this on uml:
> 
> arch/um/sys-i386/built-in.o: In function `sys_call_table':
> (.rodata+0x308): undefined reference to `sys_sigprocmask'
> 
> Reason for this is that uml passes the preprocessor option
> -Dsigprocmask=kernel_sigprocmask to gcc when compiling the kernel.
> This causes SYSCALL_DEFINE3(sigprocmask, ...) to be expanded to
> SYSCALL_DEFINEx(3, kernel_sigprocmask, ...) and finally to a system call
> named sys_kernel_sigprocmask. However sys_sigprocmask is missing because
> of this.
> To avoid macro expansion for the system call name just concatenate the
> name at first define instead of carrying it through severel levels.
> This was pointed out by Al Viro.
> 
> Signed-off-by: Heiko Carstens <heiko.carstens@...ibm.com>

For the record:

Acked-by: Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>

With kind regards,

Geert Uytterhoeven
Software Architect

Sony Techsoft Centre Europe
The Corporate Village · Da Vincilaan 7-D1 · B-1935 Zaventem · Belgium

Phone:    +32 (0)2 700 8453
Fax:      +32 (0)2 700 8622
E-mail:   Geert.Uytterhoeven@...ycom.com
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