linux-kernel - Re: [RFC 1/3] add support for exporting symbols from .S files

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Date:	Tue, 12 Aug 2008 16:43:52 +1000
From:	Stephen Rothwell <sfr@...b.auug.org.au>
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>, linuxppc-dev@...abs.org
Subject: Re: [RFC 1/3] add support for exporting symbols from .S files

Hi Arnd,

On Mon, 11 Aug 2008 16:18:07 +0200 Arnd Bergmann <arnd@...db.de> wrote:
>
> +#ifdef CONFIG_MODULES
> +.macro __EXPORT_SYMBOL sym section symtab strtab
> +	.section \section,"a",@progbits
> +	.type \symtab, @object
> +	.ifeq BITS_PER_LONG-32
> +	.align 3
> +\symtab:
> +	.long \sym
> +	.long \strtab
> +	.else
> +	.align 4

This won't be portable across architectures as .align is sometimes in
bytes and sometimes a power of two.  You can use .balign or .p2align
portably on gas, though. 

-- 
Cheers,
Stephen Rothwell                    sfr@...b.auug.org.au
http://www.canb.auug.org.au/~sfr/

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