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authorMartin Schwidefsky2018-03-26 15:23:33 +0200
committerMartin Schwidefsky2018-03-28 08:38:28 +0200
commite5b98199deb013609af7106a1fb9e779a7f6744a (patch)
treeccb9623e556a22fbbf73959383c5c17a5c254cac /arch/s390
parentb058661a993aafc718ce713221bb1d57588c3710 (diff)
s390/lpp: use assembler alternatives for the LPP instruction
With the new macros for CPU alternatives the MACHINE_FLAG_LPP check around the LPP instruction can be optimized. After this is done the flag can be removed. Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/cpu_mf.h4
-rw-r--r--arch/s390/include/asm/setup.h2
-rw-r--r--arch/s390/kernel/early.c2
-rw-r--r--arch/s390/kernel/entry.S14
4 files changed, 8 insertions, 14 deletions
diff --git a/arch/s390/include/asm/cpu_mf.h b/arch/s390/include/asm/cpu_mf.h
index dd08db491b89..f58d17e9dd65 100644
--- a/arch/s390/include/asm/cpu_mf.h
+++ b/arch/s390/include/asm/cpu_mf.h
@@ -29,12 +29,12 @@
/* CPU measurement facility support */
static inline int cpum_cf_avail(void)
{
- return MACHINE_HAS_LPP && test_facility(67);
+ return test_facility(40) && test_facility(67);
}
static inline int cpum_sf_avail(void)
{
- return MACHINE_HAS_LPP && test_facility(68);
+ return test_facility(40) && test_facility(68);
}
diff --git a/arch/s390/include/asm/setup.h b/arch/s390/include/asm/setup.h
index 2eb0c8a7b664..124154fdfc97 100644
--- a/arch/s390/include/asm/setup.h
+++ b/arch/s390/include/asm/setup.h
@@ -25,7 +25,6 @@
#define MACHINE_FLAG_DIAG44 _BITUL(6)
#define MACHINE_FLAG_EDAT1 _BITUL(7)
#define MACHINE_FLAG_EDAT2 _BITUL(8)
-#define MACHINE_FLAG_LPP _BITUL(9)
#define MACHINE_FLAG_TOPOLOGY _BITUL(10)
#define MACHINE_FLAG_TE _BITUL(11)
#define MACHINE_FLAG_TLB_LC _BITUL(12)
@@ -66,7 +65,6 @@ extern void detect_memory_memblock(void);
#define MACHINE_HAS_DIAG44 (S390_lowcore.machine_flags & MACHINE_FLAG_DIAG44)
#define MACHINE_HAS_EDAT1 (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT1)
#define MACHINE_HAS_EDAT2 (S390_lowcore.machine_flags & MACHINE_FLAG_EDAT2)
-#define MACHINE_HAS_LPP (S390_lowcore.machine_flags & MACHINE_FLAG_LPP)
#define MACHINE_HAS_TOPOLOGY (S390_lowcore.machine_flags & MACHINE_FLAG_TOPOLOGY)
#define MACHINE_HAS_TE (S390_lowcore.machine_flags & MACHINE_FLAG_TE)
#define MACHINE_HAS_TLB_LC (S390_lowcore.machine_flags & MACHINE_FLAG_TLB_LC)
diff --git a/arch/s390/kernel/early.c b/arch/s390/kernel/early.c
index 53d089fc4501..b00b515baa53 100644
--- a/arch/s390/kernel/early.c
+++ b/arch/s390/kernel/early.c
@@ -242,8 +242,6 @@ static __init void detect_machine_facilities(void)
S390_lowcore.machine_flags |= MACHINE_FLAG_EDAT2;
if (test_facility(3))
S390_lowcore.machine_flags |= MACHINE_FLAG_IDTE;
- if (test_facility(40))
- S390_lowcore.machine_flags |= MACHINE_FLAG_LPP;
if (test_facility(50) && test_facility(73)) {
S390_lowcore.machine_flags |= MACHINE_FLAG_TE;
__ctl_set_bit(0, 55);
diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S
index ee1b2f7b3d05..0aa205e32f7d 100644
--- a/arch/s390/kernel/entry.S
+++ b/arch/s390/kernel/entry.S
@@ -58,6 +58,8 @@ _CIF_WORK = (_CIF_MCCK_PENDING | _CIF_ASCE_PRIMARY | \
_CIF_ASCE_SECONDARY | _CIF_FPU)
_PIF_WORK = (_PIF_PER_TRAP | _PIF_SYSCALL_RESTART)
+_LPP_OFFSET = __LC_LPP
+
#define BASED(name) name-cleanup_critical(%r13)
.macro TRACE_IRQS_ON
@@ -281,10 +283,8 @@ ENTRY(__switch_to)
aghi %r3,__TASK_pid
mvc __LC_CURRENT_PID(4,%r0),0(%r3) # store pid of next
lmg %r6,%r15,__SF_GPRS(%r15) # load gprs of next task
- TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
- jz 0f
- .insn s,0xb2800000,__LC_LPP # set program parameter
-0: BR_R1USE_R14
+ ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
+ BR_R1USE_R14
.L__critical_start:
@@ -1243,10 +1243,8 @@ ENTRY(mcck_int_handler)
# PSW restart interrupt handler
#
ENTRY(restart_int_handler)
- TSTMSK __LC_MACHINE_FLAGS,MACHINE_FLAG_LPP
- jz 0f
- .insn s,0xb2800000,__LC_LPP
-0: stg %r15,__LC_SAVE_AREA_RESTART
+ ALTERNATIVE "", ".insn s,0xb2800000,_LPP_OFFSET", 40
+ stg %r15,__LC_SAVE_AREA_RESTART
lg %r15,__LC_RESTART_STACK
aghi %r15,-__PT_SIZE # create pt_regs on stack
xc 0(__PT_SIZE,%r15),0(%r15)