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Commit 80376f34 authored by Jan Glauber's avatar Jan Glauber Committed by Martin Schwidefsky
Browse files

[S390] Introduce get_clock_fast() 



Add get_clock_fast() which uses the slightly faster stckf if available.
If stckf is not available fall back to stck, which has the same width.

Signed-off-by: default avatarJan Glauber <jang@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 388186bc

arch/s390/include/asm/timex.h

+11 −0
Original line number Diff line number Diff line
@@ -86,6 +86,17 @@ 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 (test_facility(25))

		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];