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authorHeiko Carstens <heiko.carstens@de.ibm.com>2012-05-09 16:27:39 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2012-05-16 14:42:41 +0200
commit473e66baad1e83e6c5dfdca65aba03bf21727202 (patch)
treeaab0bd4a295b41d1e29952b2b1260ad72150496b /arch/s390/include/asm/timex.h
parent2739b6d12407792f253b7a15233930338e6831c9 (diff)
s390/time: always use stckf instead of stck if available
The store clock fast instruction saves a couple of instructions compared to the store clock instruction. Always use stckf instead of stck if it is available. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390/include/asm/timex.h')
-rw-r--r--arch/s390/include/asm/timex.h17
1 files changed, 5 insertions, 12 deletions
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index c447a27a7fdb..72eaa8511a4f 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -73,11 +73,15 @@ static inline void local_tick_enable(unsigned long long comp)
typedef unsigned long long cycles_t;
-static inline unsigned long long get_clock (void)
+static inline unsigned long long get_clock(void)
{
unsigned long long clk;
+#if defined(CONFIG_64BIT) && !defined(CONFIG_MARCH_Z900) && !defined(CONFIG_MARCH_Z990)
+ asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
+#else
asm volatile("stck %0" : "=Q" (clk) : : "cc");
+#endif
return clk;
}
@@ -86,17 +90,6 @@ static inline void get_clock_ext(char *clk)
asm volatile("stcke %0" : "=Q" (*clk) : : "cc");
}
-static inline unsigned long long get_clock_fast(void)
-{
- unsigned long long clk;
-
- if (MACHINE_HAS_STCKF)
- asm volatile(".insn s,0xb27c0000,%0" : "=Q" (clk) : : "cc");
- else
- clk = get_clock();
- return clk;
-}
-
static inline unsigned long long get_clock_xt(void)
{
unsigned char clk[16];