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s390/entry: use cpu alternative for stck/stckf 

Use a cpu alternative to switch between stck and stckf instead of
making it compile time dependent. This will also make kernels compiled
for old machines, but running on newer machines, use stckf.

Reviewed-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2021-02-02 13:46:47 +01:00 committed by Vasily Gorbik
parent b22446d00a
commit 78f6570946
1 changed files with 3 additions and 5 deletions
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8
arch/s390/kernel/entry.S
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@ -106,12 +106,10 @@ _LPP_OFFSET = __LC_LPP
2: la %r11,STACK_FRAME_OVERHEAD(%r15)
.endm
# Use STORE CLOCK by default, switch to STORE CLOCK FAST if available.
.macro STCK savearea
#ifdef CONFIG_HAVE_MARCH_Z9_109_FEATURES
.insn s,0xb27c0000,\savearea # store clock fast
#else
.insn s,0xb2050000,\savearea # store clock
#endif
ALTERNATIVE ".insn s,0xb2050000,\savearea", \
".insn s,0xb27c0000,\savearea", 25
.endm
/*