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

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Date:	Wed, 4 Feb 2009 18:26:06 +0100 (CET)
From:	Geert Uytterhoeven <Geert.Uytterhoeven@...ycom.com>
To:	Shane Hathaway <shane@...hawaymix.org>
cc:	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>
Subject: Re: [uml-devel] [Patch] uml: fix a link error

On Mon, 19 Jan 2009, Shane Hathaway wrote:
> Daolong Wang wrote:
> > On Mon, Jan 19, 2009 at 11:21 PM, Jeff Dike <jdike@...toit.com> wrote:
> >> On Sun, Jan 18, 2009 at 02:23:46PM +0800, Daolong Wang wrote:
> >>> I can confirm this link error.
> >> In what environment?  I see no problems here.
> 
> I can also confirm this link error.  The problem occurs when compiling
> either 2.6.28.1 or 2.6.27.12; I didn't try anything earlier.  The patch
> suggested at this beginning of this thread did solve the link problem
> and the resulting kernel ran for several hours.  However, I think the
> patch is still probably incorrect.
> 
> I'm going to repost what I said in another message I sent today, this
> time with a wider audience:
> 
> The problem is that the name "sigprocmask" is getting renamed to
> "kernel_sigprocmask" by a compiler directive in arch/um/Makefile, then
> that name gets mangled into "sys_kernel_sigprocmask" by the
> SYSCALL_DEFINE3(sigprocmask, ...) macro in kernel/signal.c.
> 
> So, instead of the patch suggested earlier, I added the following line
> to arch/um/sys-i386/sys_call_table.S:
> 
> #define sys_sigprocmask sys_kernel_sigprocmask
> 
> This made it compile and link correctly.  Look at the symbols generated
> by the compile of signal.c to see what I mean:
> 
> # nm kernel/signal.o | grep sigprocmask
> 0000008f r __kstrtab_kernel_sigprocmask
> 00000040 r __ksymtab_kernel_sigprocmask
> 00001ea6 T kernel_sigprocmask
> 00002d67 T sys_kernel_sigprocmask
> 00001faf T sys_rt_sigprocmask
> 
> Unfortunately, it's a mystery to me that others haven't run into this
> before.  My host environment is RHEL 4 inside some kind of chroot.

I've just started seeing this problem with some 2.6.29-rc3 kernel...

Before, I did not have this problem with various 2.6.28-rc8 and 2.6.29-rc1
kernels (and several older versions I don't remember).

Given 2.6.29-rc1 works for me and 2.6.28.1 fails for you, I'm inclined to
believe 2.6.28 is OK. I'll give it a try...

BTW, I'm using CentOS 5.2.

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
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E-mail:   Geert.Uytterhoeven@...ycom.com
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