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>
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index b21e46e..7244e1f 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -82,7 +82,6 @@
#define MACHINE_FLAG_LPAR (1UL << 12)
#define MACHINE_FLAG_SPP (1UL << 13)
#define MACHINE_FLAG_TOPOLOGY (1UL << 14)
-#define MACHINE_FLAG_STCKF (1UL << 15)
#define MACHINE_IS_VM (S390_lowcore.machine_flags & MACHINE_FLAG_VM)
#define MACHINE_IS_KVM (S390_lowcore.machine_flags & MACHINE_FLAG_KVM)
@@ -101,7 +100,6 @@
#define MACHINE_HAS_PFMF (0)
#define MACHINE_HAS_SPP (0)
#define MACHINE_HAS_TOPOLOGY (0)
-#define MACHINE_HAS_STCKF (0)
#else /* __s390x__ */
#define MACHINE_HAS_IEEE (1)
#define MACHINE_HAS_CSP (1)
@@ -113,7 +111,6 @@
#define MACHINE_HAS_PFMF (S390_lowcore.machine_flags & MACHINE_FLAG_PFMF)
#define MACHINE_HAS_SPP (S390_lowcore.machine_flags & MACHINE_FLAG_SPP)
#define MACHINE_HAS_TOPOLOGY (S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
-#define MACHINE_HAS_STCKF (S390_lowcore.machine_flags & MACHINE_FLAG_STCKF)
#endif /* __s390x__ */
#define ZFCPDUMP_HSA_SIZE (32UL<<20)
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index c447a27..72eaa85 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -73,11 +73,15 @@
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 @@
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];