From: Arnd Bergmann <arnd@arndb.de>
Date: Fri, 21 Jun 2013 19:55:35 +0000 (+0200)
Subject: staging: line6: avoid __sync_fetch_and_{and,or}
X-Git-Tag: v3.2.70~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=cee9e1e861382df144a3a880f8e2c89285197a3e;p=pandora-kernel.git

staging: line6: avoid __sync_fetch_and_{and,or}

commit 9f613601482c56e05884f21565e3d218fac427ae upstream.

__sync_fetch_and_and and __sync_fetch_and_or are functions that are provided
by gcc and depending on the target architecture may be implemented in libgcc,
which is not always available in the kernel. This leads to a build failure
on ARMv5:

drivers/built-in.o: In function `line6_pcm_release':
:(.text+0x3bfe80): undefined reference to `__sync_fetch_and_and_4'
drivers/built-in.o: In function `line6_pcm_acquire':
:(.text+0x3bff30): undefined reference to `__sync_fetch_and_or_4'

To work around this, we can use the kernel-provided cmpxchg macro.

Build-tested only.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Markus Grabner <grabner@icg.tugraz.at>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
[bwh: Backported to 3.2:
 - Adjust context
 - Fix up two more instances of __sync_fetch_and_and() that were removed
   separately upstream]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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