staging: line6: avoid __sync_fetch_and_{and,or}
authorArnd Bergmann <arnd@arndb.de>
Fri, 21 Jun 2013 19:55:35 +0000 (21:55 +0200)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Mon, 24 Jun 2013 22:56:09 +0000 (15:56 -0700)
commit9f613601482c56e05884f21565e3d218fac427ae
tree1c7ad18452c2f0811bc495e6bdd1245fd43ed810
parent5c1f62a75ca29d91606fd6e8bdeb2cff88086e0f
staging: line6: avoid __sync_fetch_and_{and,or}

__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>
drivers/staging/line6/pcm.c