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s390/facility: decompose test_facility() 

The patch decomposes the function test_facility() into its API
test_facility() and its implementation __test_facility(). This
allows to reuse the implementation with a different API.

Patch is used to prepare checkin of SIE satellite code.

Signed-off-by: Michael Mueller <mimu@linux.vnet.ibm.com>
Acked-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Mueller 2013-06-20 15:11:39 +02:00 committed by Martin Schwidefsky
parent 749d3f9c81
commit 32089246e3
1 changed files with 11 additions and 6 deletions
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17
arch/s390/include/asm/facility.h
View File

@ -13,6 +13,16 @@
#define MAX_FACILITY_BIT (256*8) /* stfle_fac_list has 256 bytes */
static inline int __test_facility(unsigned long nr, void *facilities)
{
unsigned char *ptr;
if (nr >= MAX_FACILITY_BIT)
return 0;
ptr = (unsigned char *) facilities + (nr >> 3);
return (*ptr & (0x80 >> (nr & 7))) != 0;
}
/*
* The test_facility function uses the bit odering where the MSB is bit 0.
* That makes it easier to query facility bits with the bit number as
@ -20,12 +30,7 @@
*/
static inline int test_facility(unsigned long nr)
{
unsigned char *ptr;
if (nr >= MAX_FACILITY_BIT)
return 0;
ptr = (unsigned char *) &S390_lowcore.stfle_fac_list + (nr >> 3);
return (*ptr & (0x80 >> (nr & 7))) != 0;
return __test_facility(nr, &S390_lowcore.stfle_fac_list);
}
/**