From 5b3f683e694a835f5dfdab06102be1a50604c3b7 Mon Sep 17 00:00:00 2001
From: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Date: Mon, 7 Apr 2014 18:25:23 +0200
Subject: [PATCH] s390/spinlock: cleanup spinlock code

Improve the spinlock code in several aspects:
 - Have _raw_compare_and_swap return true if the operation has been
   successful instead of returning the old value.
 - Remove the "volatile" from arch_spinlock_t and arch_rwlock_t
 - Rename 'owner_cpu' to 'lock'
 - Add helper functions arch_spin_trylock_once / arch_spin_tryrelease_once

[ Martin Schwidefsky: patch breakdown and code beautification ]

Signed-off-by: Philipp Hachtmann <phacht@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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