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s390/time: always use stckf instead of stck if available

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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>
This commit is contained in:
Heiko Carstens
2012-05-09 16:27:39 +02:00
committed by Martin Schwidefsky
parent 2739b6d124
commit 473e66baad
5 changed files with 19 additions and 23 deletions
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17
arch/s390/include/asm/timex.h
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@@ -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];