From mboxrd@z Thu Jan 1 00:00:00 1970 From: jg1.han@samsung.com (Jingoo Han) Date: Fri, 17 Jan 2014 17:04:32 +0900 Subject: [PATCH] arm64: mm: use ubfm for dcache_line_size Message-ID: <000301cf135a$c1390e40$43ab2ac0$%han@samsung.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org Use 'ubfm' for the bitfield move instruction; thus, single instruction can be used instead of two instructions, when getting the minimum D-cache line size from CTR_EL0 register. Signed-off-by: Jingoo Han --- arch/arm64/mm/proc-macros.S | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/arch/arm64/mm/proc-macros.S b/arch/arm64/mm/proc-macros.S index 8957b82..c31f41e 100644 --- a/arch/arm64/mm/proc-macros.S +++ b/arch/arm64/mm/proc-macros.S @@ -38,8 +38,7 @@ */ .macro dcache_line_size, reg, tmp mrs \tmp, ctr_el0 // read CTR - lsr \tmp, \tmp, #16 - and \tmp, \tmp, #0xf // cache line size encoding + ubfm \tmp, \tmp, #0x16, 0x19 // cache line size encoding mov \reg, #4 // bytes per word lsl \reg, \reg, \tmp // actual cache line size .endm -- 1.7.10.4