linux-kernel - Re: RFC: killing ksyms.c

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Message-ID: <20080811150358.GC3338@cs181140183.pp.htv.fi>
Date:	Mon, 11 Aug 2008 18:03:58 +0300
From:	Adrian Bunk <bunk@...nel.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	linux-kernel <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org, Matthew Wilcox <matthew@....cx>,
	David Woodhouse <dwmw2@...radead.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: RFC: killing ksyms.c

On Mon, Aug 11, 2008 at 04:06:43PM +0200, Arnd Bergmann wrote:
> I saw this conversation on IRC when I came back to my screen, and
> managed to dig out an older patch of mine:
> 
> [19:03:13] <willy> at some point we really need to forbid that
> [19:03:28] <willy> bit hard at this point with things like memcpy()
> [19:04:36] <willy> could do it with a script of some kind and
>            either a whitelist of filenames (arch/*/kernel/ksyms.c
>            can export anything) or of functions (anywhere can
>            EXPORT_SYMBOL(memcpy)).
> [Sun Aug 10 2008] [19:07:35] <viro> I suspect that we really want
>            to teach *.S how to do exports
> [Sun Aug 10 2008] [19:07:58] <viro> and kill ksyms.c
> [Sun Aug 10 2008] [19:12:47] <dwmw2_gone> if we do the -fwhole-program
>            --combine thing we'll make it hard anyway
> 
> I compile-tested this on powerpc, 32 and 64 bit, and it should be usable as
> an example for other architectures.
> The idea is to provide an EXPORT_SYMBOL macro for assembly that
> behaves in the same way as the C version, and then export every
> symbol from the file that defines it.
>...

On some architectures the kernel is linked with libgcc and symbols from 
libgcc are EXPORT_SYMBOL'ed.

> 	Arnd <><

cu
Adrian

-- 

       "Is there not promise of rain?" Ling Tan asked suddenly out
        of the darkness. There had been need of rain for many days.
       "Only a promise," Lao Er said.
                                       Pearl S. Buck - Dragon Seed

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