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Commit 6ab6c31a authored by Heiko Carstens's avatar Heiko Carstens Committed by Martin Schwidefsky
Browse files

s390/facilities: optimize test_facility() 



test_facility() can be optimized for bits which must be set anyway,
due to the check in head.S. This removes a couple of superfluous
runtime checks.

Signed-off-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
parent 185edd44

arch/s390/include/asm/facility.h

+6 −0
Original line number Diff line number Diff line
@@ -34,6 +34,12 @@ static inline int __test_facility(unsigned long nr, void *facilities) 
 */

static inline int test_facility(unsigned long nr)

{

	unsigned long facilities_als[] = { FACILITIES_ALS };



	if (__builtin_constant_p(nr) && nr < sizeof(facilities_als) * 8) {

		if (__test_facility(nr, &facilities_als))

			return 1;

	}

	return __test_facility(nr, &S390_lowcore.stfle_fac_list);

}