[S390] New get_cpu_id() inline assembly

Replace two stidp inline assemblies with one global implementation.

Signed-off-by: Michael Holzheu <holzheu@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index e518dd5..011e8c7 100644 (file)
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -129,7 +129,7 @@ static noinline __init void detect_machine_type(void)
 {
        struct cpuinfo_S390 *cpuinfo = &S390_lowcore.cpu_data;
 
-       asm volatile("stidp %0" : "=m" (S390_lowcore.cpu_data.cpu_id));
+       get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
 
        /* Running under z/VM ? */
        if (cpuinfo->cpu_id.version == 0xff)

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 50c5210..49567d8 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -106,7 +106,7 @@ void __devinit cpu_init (void)
         /*
          * Store processor id in lowcore (used e.g. in timer_interrupt)
          */
-       asm volatile("stidp %0": "=m" (S390_lowcore.cpu_data.cpu_id));
+       get_cpu_id(&S390_lowcore.cpu_data.cpu_id);
         S390_lowcore.cpu_data.cpu_addr = addr;
 
         /*

diff --git a/include/asm-s390/processor.h b/include/asm-s390/processor.h
index 4c1b739..33b80ce 100644 (file)
--- a/include/asm-s390/processor.h
+++ b/include/asm-s390/processor.h
@@ -36,6 +36,11 @@ typedef struct
         unsigned int unused  : 16;
 } __attribute__ ((packed)) cpuid_t;
 
+static inline void get_cpu_id(cpuid_t *ptr)
+{
+       asm volatile("stidp 0(%1)" : "=m" (*ptr) : "a" (ptr));
+}
+
 struct cpuinfo_S390
 {
         cpuid_t  cpu_id;