Commit df4623fb authored by Heiko Carstens's avatar Heiko Carstens Committed by Vasily Gorbik
Browse files

s390/lowcore: Use lghi instead llilh to clear register 



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

Suggested-by: default avatarJuergen Christ <jchrist@linux.ibm.com>
Reviewed-by: default avatarJuergen Christ <jchrist@linux.ibm.com>
Signed-off-by: default avatarHeiko Carstens <hca@linux.ibm.com>
Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent a0f2a8d0

arch/s390/include/asm/lowcore.h

+2 −2
Original line number Diff line number Diff line
@@ -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