linux-kernel - Re: [PATCH 2.4.34-pre1] fix x86_64 etc build failure due to memchr change

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Date:	Sun, 20 Aug 2006 01:16:47 +0200
From:	Willy Tarreau <w@....eu>
To:	Mikael Pettersson <mikpe@...uu.se>
Cc:	ak@...e.de, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.4.34-pre1] fix x86_64 etc build failure due to memchr change

On Sun, Aug 20, 2006 at 12:19:06AM +0200, Mikael Pettersson wrote:
> 2.4.34-pre1 doesn't build on x86_64:
> 
> kernel/kernel.o(__ksymtab+0x1c10): multiple definition of `__ksymtab_memchr'
> arch/x86_64/kernel/kernel.o(__ksymtab+0x3f0): first defined here
> kernel/kernel.o(.kstrtab+0x3960): multiple definition of `__kstrtab_memchr'
> arch/x86_64/kernel/kernel.o(.kstrtab+0x5fd): first defined here
> ld: Warning: size of symbol `__kstrtab_memchr' changed from 7 in arch/x86_64/kernel/kernel.o to 17 in kernel/kernel.o
> make: *** [vmlinux] Error 1
> 
> This is because the 'export memchr() which is used by smbfs and lp driver'
> change in 2.4.34-pre1 added an EXPORT_SYMBOL of memchr to kernel/ksyms.c
> without also removing the existing one in arch/x86_64/kernel/x8664_ksyms.c.
> Alpha, ARM, ppc32, and SH also have EXPORTs of memchr so they probably
> also broke.
> 
> This patch removes the EXPORTs of memchr under arch/, which fixes x86_64
> and should fix the other architectures as well.

Mikael,

I added that patch when I discovered that smbfs had unresolved symbols
on sparc. I was not aware of those per-arch exports, and probably that
I should have added such an export to sparc only instead of adding it
to the whole kernel.

I will try to revert it first and only fix sparc, and if that does not
work, then I will use your fix. But if I can touch only one arch, I'd
feel more comfortable.

Thanks for your report,
Willy



> Signed-off-by: Mikael Pettersson <mikpe@...uu.se>
> 
> diff -rupN linux-2.4.34-pre1/arch/alpha/kernel/alpha_ksyms.c linux-2.4.34-pre1.kill-arch-memchr-exports/arch/alpha/kernel/alpha_ksyms.c
> --- linux-2.4.34-pre1/arch/alpha/kernel/alpha_ksyms.c	2003-06-14 13:30:18.000000000 +0200
> +++ linux-2.4.34-pre1.kill-arch-memchr-exports/arch/alpha/kernel/alpha_ksyms.c	2006-08-20 00:10:15.000000000 +0200
> @@ -268,7 +268,6 @@ EXPORT_SYMBOL_NOVERS(__remq);
>  EXPORT_SYMBOL_NOVERS(__remqu);
>  EXPORT_SYMBOL_NOVERS(memcpy);
>  EXPORT_SYMBOL_NOVERS(memset);
> -EXPORT_SYMBOL_NOVERS(memchr);
>  
>  EXPORT_SYMBOL(get_wchan);
>  
> diff -rupN linux-2.4.34-pre1/arch/arm/kernel/armksyms.c linux-2.4.34-pre1.kill-arch-memchr-exports/arch/arm/kernel/armksyms.c
> --- linux-2.4.34-pre1/arch/arm/kernel/armksyms.c	2003-08-25 20:07:40.000000000 +0200
> +++ linux-2.4.34-pre1.kill-arch-memchr-exports/arch/arm/kernel/armksyms.c	2006-08-20 00:10:15.000000000 +0200
> @@ -193,7 +193,6 @@ EXPORT_SYMBOL_NOVERS(memcpy);
>  EXPORT_SYMBOL_NOVERS(memmove);
>  EXPORT_SYMBOL_NOVERS(memcmp);
>  EXPORT_SYMBOL_NOVERS(memscan);
> -EXPORT_SYMBOL_NOVERS(memchr);
>  EXPORT_SYMBOL_NOVERS(__memzero);
>  
>  	/* user mem (segment) */
> diff -rupN linux-2.4.34-pre1/arch/ia64/kernel/ia64_ksyms.c linux-2.4.34-pre1.kill-arch-memchr-exports/arch/ia64/kernel/ia64_ksyms.c
> --- linux-2.4.34-pre1/arch/ia64/kernel/ia64_ksyms.c	2004-04-14 20:22:20.000000000 +0200
> +++ linux-2.4.34-pre1.kill-arch-memchr-exports/arch/ia64/kernel/ia64_ksyms.c	2006-08-20 00:10:15.000000000 +0200
> @@ -10,7 +10,6 @@ EXPORT_SYMBOL(pm_idle);
>  #include <linux/string.h>
>  
>  EXPORT_SYMBOL_NOVERS(memset);
> -EXPORT_SYMBOL(memchr);
>  EXPORT_SYMBOL(memcmp);
>  EXPORT_SYMBOL_NOVERS(memcpy);
>  EXPORT_SYMBOL(memmove);
> diff -rupN linux-2.4.34-pre1/arch/ppc/kernel/ppc_ksyms.c linux-2.4.34-pre1.kill-arch-memchr-exports/arch/ppc/kernel/ppc_ksyms.c
> --- linux-2.4.34-pre1/arch/ppc/kernel/ppc_ksyms.c	2004-04-14 20:22:20.000000000 +0200
> +++ linux-2.4.34-pre1.kill-arch-memchr-exports/arch/ppc/kernel/ppc_ksyms.c	2006-08-20 00:10:15.000000000 +0200
> @@ -300,7 +300,6 @@ EXPORT_SYMBOL_NOVERS(memset);
>  EXPORT_SYMBOL_NOVERS(memmove);
>  EXPORT_SYMBOL_NOVERS(memscan);
>  EXPORT_SYMBOL_NOVERS(memcmp);
> -EXPORT_SYMBOL_NOVERS(memchr);
>  
>  EXPORT_SYMBOL(abs);
>  
> diff -rupN linux-2.4.34-pre1/arch/sh/kernel/sh_ksyms.c linux-2.4.34-pre1.kill-arch-memchr-exports/arch/sh/kernel/sh_ksyms.c
> --- linux-2.4.34-pre1/arch/sh/kernel/sh_ksyms.c	2003-11-29 00:28:11.000000000 +0100
> +++ linux-2.4.34-pre1.kill-arch-memchr-exports/arch/sh/kernel/sh_ksyms.c	2006-08-20 00:10:15.000000000 +0200
> @@ -60,7 +60,6 @@ EXPORT_SYMBOL(pcibios_penalize_isa_irq);
>  
>  /* mem exports */
>  EXPORT_SYMBOL(memscan);
> -EXPORT_SYMBOL(memchr);
>  EXPORT_SYMBOL(memcpy);
>  EXPORT_SYMBOL(memcpy_fromio);
>  EXPORT_SYMBOL(memcpy_toio);
> diff -rupN linux-2.4.34-pre1/arch/x86_64/kernel/x8664_ksyms.c linux-2.4.34-pre1.kill-arch-memchr-exports/arch/x86_64/kernel/x8664_ksyms.c
> --- linux-2.4.34-pre1/arch/x86_64/kernel/x8664_ksyms.c	2004-11-17 18:36:41.000000000 +0100
> +++ linux-2.4.34-pre1.kill-arch-memchr-exports/arch/x86_64/kernel/x8664_ksyms.c	2006-08-20 00:10:15.000000000 +0200
> @@ -171,7 +171,6 @@ EXPORT_SYMBOL_NOVERS(strchr);
>  EXPORT_SYMBOL_NOVERS(strcat);
>  EXPORT_SYMBOL_NOVERS(strcmp);
>  EXPORT_SYMBOL_NOVERS(strncat);
> -EXPORT_SYMBOL_NOVERS(memchr);
>  EXPORT_SYMBOL_NOVERS(strrchr);
>  EXPORT_SYMBOL_NOVERS(strnlen);
>  EXPORT_SYMBOL_NOVERS(memcmp);
-
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