s390/spinlock: optimize spinlock code sequence

Use lowcore constant to improve the code generated for spinlocks.

[ 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>

1 files changed, 4 insertions, 0 deletions

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 1f5536c2fd02..7c5b05fa2194 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -373,6 +373,10 @@ static void __init setup_lowcore(void)
         mem_assign_absolute(S390_lowcore.restart_source, lc->restart_source);
         mem_assign_absolute(S390_lowcore.restart_psw, lc->restart_psw);
 
+#ifdef CONFIG_SMP
+        lc->spinlock_lockval = arch_spin_lockval(0);
+#endif
+
         set_prefix((u32)(unsigned long) lc);
         lowcore_ptr[0] = lc;
 }