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authorIngo Molnar <[email protected]>2015-02-24 08:41:07 +0100
committerIngo Molnar <[email protected]>2015-02-24 08:41:07 +0100
commit2ae79026818e7d49fead82b79b1a543e3b9c8a23 (patch)
treec7ee7bd8b37b0880918d361839fd95988fac2dac /arch/s390/kernel/processor.c
parent1a99367023f6ac664365a37fa508b059e31d0e88 (diff)
parentc517d838eb7d07bbe9507871fab3931deccff539 (diff)
Merge tag 'v4.0-rc1' into locking/core, to refresh the tree before merging new changes
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'arch/s390/kernel/processor.c')
-rw-r--r--arch/s390/kernel/processor.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/arch/s390/kernel/processor.c b/arch/s390/kernel/processor.c
index dbdd33ee0102..26108232fcaa 100644
--- a/arch/s390/kernel/processor.c
+++ b/arch/s390/kernel/processor.c
@@ -8,16 +8,24 @@
#include <linux/kernel.h>
#include <linux/init.h>
-#include <linux/smp.h>
#include <linux/seq_file.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <asm/elf.h>
#include <asm/lowcore.h>
#include <asm/param.h>
+#include <asm/smp.h>
static DEFINE_PER_CPU(struct cpuid, cpu_id);
+void cpu_relax(void)
+{
+ if (!smp_cpu_mtid && MACHINE_HAS_DIAG44)
+ asm volatile("diag 0,0,0x44");
+ barrier();
+}
+EXPORT_SYMBOL(cpu_relax);
+
/*
* cpu_init - initializes state that is per-CPU.
*/