diff options
Diffstat (limited to 'arch/s390/kernel/processor.c')
| -rw-r--r-- | arch/s390/kernel/processor.c | 10 |
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. */ |