[S390] cleanup facility list handling
Store the facility list once at system startup with stfl/stfle and
reuse the result for all facility tests.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 9071e98..e3ceb91 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -409,6 +409,9 @@
lc->current_task = (unsigned long) init_thread_union.thread_info.task;
lc->thread_info = (unsigned long) &init_thread_union;
lc->machine_flags = S390_lowcore.machine_flags;
+ lc->stfl_fac_list = S390_lowcore.stfl_fac_list;
+ memcpy(lc->stfle_fac_list, S390_lowcore.stfle_fac_list,
+ MAX_FACILITY_BIT/8);
#ifndef CONFIG_64BIT
if (MACHINE_HAS_IEEE) {
lc->extended_save_area_addr = (__u32)
@@ -675,12 +678,9 @@
static void __init setup_hwcaps(void)
{
static const int stfl_bits[6] = { 0, 2, 7, 17, 19, 21 };
- unsigned long long facility_list_extended;
- unsigned int facility_list;
struct cpuid cpu_id;
int i;
- facility_list = stfl();
/*
* The store facility list bits numbers as found in the principles
* of operation are numbered with bit 1UL<<31 as number 0 to
@@ -700,11 +700,10 @@
* HWCAP_S390_ETF3EH bit 8 (22 && 30).
*/
for (i = 0; i < 6; i++)
- if (facility_list & (1UL << (31 - stfl_bits[i])))
+ if (test_facility(stfl_bits[i]))
elf_hwcap |= 1UL << i;
- if ((facility_list & (1UL << (31 - 22)))
- && (facility_list & (1UL << (31 - 30))))
+ if (test_facility(22) && test_facility(30))
elf_hwcap |= HWCAP_S390_ETF3EH;
/*
@@ -720,12 +719,8 @@
* translated to:
* HWCAP_S390_DFP bit 6 (42 && 44).
*/
- if ((elf_hwcap & (1UL << 2)) &&
- __stfle(&facility_list_extended, 1) > 0) {
- if ((facility_list_extended & (1ULL << (63 - 42)))
- && (facility_list_extended & (1ULL << (63 - 44))))
- elf_hwcap |= HWCAP_S390_DFP;
- }
+ if ((elf_hwcap & (1UL << 2)) && test_facility(42) && test_facility(44))
+ elf_hwcap |= HWCAP_S390_DFP;
/*
* Huge page support HWCAP_S390_HPAGE is bit 7.