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

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Date:	Thu, 02 May 2013 09:58:08 +0930
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	James Hogan <james.hogan@...tec.com>, torvalds@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, James Hogan <james.hogan@...tec.com>,
	Al Viro <viro@...iv.linux.org.uk>,
	Mike Frysinger <vapier@...too.org>,
	uclinux-dist-devel@...ckfin.uclinux.org
Subject: Re: [PATCH] linkage.h: fix build breakage due to symbol prefix handling

James Hogan <james.hogan@...tec.com> writes:
> 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.

I just pushed my modules-next tree to Linus, so hopefully the nightmare
is over soon!

Cheers,
Rusty.
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