linux-kernel - Re: [PATCH] linkage.h: fix build breakage due to symbol prefix handling

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Message-ID: <20130501214335.GB11630@ZenIV.linux.org.uk>
Date:	Wed, 1 May 2013 22:43:35 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	James Hogan <james.hogan@...tec.com>
Cc:	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	Mike Frysinger <vapier@...too.org>,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH] linkage.h: fix build breakage due to symbol prefix
 handling

On Wed, May 01, 2013 at 10:04:17PM +0100, James Hogan wrote:
> Al's commit e1b5bb6d1236d4ad2084c53aa83dde7cdf6f8eea ("consolidate
> cond_syscall and SYSCALL_ALIAS declarations") broke the build on
> blackfin and metag due to the following code:
> 
>   #ifndef SYMBOL_NAME
>   #ifdef CONFIG_SYMBOL_PREFIX
>   #define SYMBOL_NAME(x) CONFIG_SYMBOL_PREFIX ## x
>   #else
>   #define SYMBOL_NAME(x) x
>   #endif
>   #endif
>   #define __SYMBOL_NAME(x) __stringify(SYMBOL_NAME(x))
> 
> __stringify literally stringifies CONFIG_SYMBOL_PREFIX ##x, so you get
> lines like this in kernel/sys_ni.s:
> 
>   .weak CONFIG_SYMBOL_PREFIXsys_quotactl
>   .set CONFIG_SYMBOL_PREFIXsys_quotactl,CONFIG_SYMBOL_PREFIXsys_ni_syscall
> 
> The patches in Rusty's modules-next tree such as "CONFIG_SYMBOL_PREFIX:
> cleanup." clean up the whole mess around symbol prefixes, so this patch
> just attempts to fix the build in the mean time. The intermediate
> definition of SYMBOL_NAME above isn't used and is incorrect when
> CONFIG_SYMBOL_PREFIX is defined as CONFIG_SYMBOL_PREFIX is a quoted
> string literal, so define __SYMBOL_NAME directly depending on
> CONFIG_SYMBOL_PREFIX.

Oh, hell...  Guys, my deep apologies - what happened is that this thing
has been caught in -next, rebase done here (on top of Rusty's commit)
and *not* pushed to linux-next.  Unfortunately, folks had been too polite
and didn't keep kicking me - mistake, since the whole thing got forgotten ;-/
Sigh...
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