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

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Message-ID: <CAAG0J99nmKeXiReJ_qK==zQy5rjTo0WzG_hF1O-oee9ADTDZGw@mail.gmail.com>
Date:	Wed, 1 May 2013 23:12:33 +0100
From:	James Hogan <james.hogan@...tec.com>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <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 1 May 2013 22:43, Al Viro <viro@...iv.linux.org.uk> wrote:
> 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...

No worries. Unfortunately after the tip of linux-next started working
again with Rusty's commit it sort of fell off my radar.

Cheers
James
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