linux-kernel - [PATCH] arm64/mm: Directly use ID_AA64MMFR2_EL1_VARange

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Date:   Tue, 11 Jul 2023 14:50:55 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>, linux-kernel@...r.kernel.org
Subject: [PATCH] arm64/mm: Directly use ID_AA64MMFR2_EL1_VARange_MASK

Tools generated register fields have in place mask macros which can be used
directly instead of shifting the older right end sided masks.

Cc: Catalin Marinas <catalin.marinas@....com>
Cc: Will Deacon <will@...nel.org>
Cc: linux-arm-kernel@...ts.infradead.org
Cc: linux-kernel@...r.kernel.org
Signed-off-by: Anshuman Khandual <anshuman.khandual@....com>
---
This applies on v6.5-rc1

 arch/arm64/kernel/head.S | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/head.S b/arch/arm64/kernel/head.S
index 757a0de07f91..7b236994f0e1 100644
--- a/arch/arm64/kernel/head.S
+++ b/arch/arm64/kernel/head.S
@@ -113,7 +113,7 @@ SYM_CODE_START(primary_entry)
 	 */
 #if VA_BITS > 48
 	mrs_s	x0, SYS_ID_AA64MMFR2_EL1
-	tst	x0, #0xf << ID_AA64MMFR2_EL1_VARange_SHIFT
+	tst	x0, ID_AA64MMFR2_EL1_VARange_MASK
 	mov	x0, #VA_BITS
 	mov	x25, #VA_BITS_MIN
 	csel	x25, x25, x0, eq
@@ -756,7 +756,7 @@ SYM_FUNC_START(__cpu_secondary_check52bitva)
 	b.ne	2f
 
 	mrs_s	x0, SYS_ID_AA64MMFR2_EL1
-	and	x0, x0, #(0xf << ID_AA64MMFR2_EL1_VARange_SHIFT)
+	and	x0, x0, ID_AA64MMFR2_EL1_VARange_MASK
 	cbnz	x0, 2f
 
 	update_early_cpu_boot_status \
-- 
2.30.2