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s390/lowcore: Use lghi instead llilh to clear register

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lghi is the fastest way to clear a register. Use that intead of llilh.

Suggested-by: Juergen Christ <jchrist@linux.ibm.com>
Reviewed-by: Juergen Christ <jchrist@linux.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
2025-03-10 10:33:43 +01:00
committed by Vasily Gorbik
parent a0f2a8d051
commit df4623fb53
1 changed files with 2 additions and 2 deletions
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4
arch/s390/include/asm/lowcore.h
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@@ -224,7 +224,7 @@ static __always_inline struct lowcore *get_lowcore(void)
if (__is_defined(__DECOMPRESSOR))
return NULL;
asm_inline(
ALTERNATIVE(" llilh %[lc],0",
ALTERNATIVE(" lghi %[lc],0",
" llilh %[lc],%[alt]",
ALT_FEATURE(MFEATURE_LOWCORE))
: [lc] "=d" (lc)
@@ -242,7 +242,7 @@ static inline void set_prefix(__u32 address)
#else /* __ASSEMBLY__ */
.macro GET_LC reg
ALTERNATIVE "llilh \reg,0", \
ALTERNATIVE "lghi \reg,0", \
__stringify(llilh \reg, LOWCORE_ALT_ADDRESS >> 16), \
ALT_FEATURE(MFEATURE_LOWCORE)
.endm