Re: RFC: killing ksyms.c

[Adrian Bunk <bunk@kernel.org>]

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

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