linux-kernel - [PATCH -next 3/3] arm-soc: various: replace open coded VA->PA calculation

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Message-ID: <20211218085843.212497-4-cuigaosheng1@huawei.com>
Date:   Sat, 18 Dec 2021 16:58:43 +0800
From:   Gaosheng Cui <cuigaosheng1@...wei.com>
To:     <linux@...linux.org.uk>, <krzysztof.kozlowski@...onical.com>,
        <andrew@...n.ch>, <gregory.clement@...tlin.com>,
        <sebastian.hesselbarth@...il.com>, <vireshk@...nel.org>,
        <shiraz.linux.kernel@...il.com>, <soc@...nel.org>,
        <linus.walleij@...aro.org>, <ardb@...nel.org>,
        <cuigaosheng1@...wei.com>
CC:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <gongruiqi1@...wei.com>,
        <wangweiyang2@...wei.com>
Subject: [PATCH -next 3/3] arm-soc: various: replace open coded VA->PA calculation

From: Ard Biesheuvel <ard.biesheuvel@...aro.org>

This replaces a few copies of the open coded calculations of the
physical address in the secondary startup code of a couple of
platforms. This ensures these quantities are invariant under
runtime relocation.

Cc: Russell King <linux@...linux.org.uk>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@...aro.org>
Signed-off-by: Gaosheng Cui <cuigaosheng1@...wei.com>
---
 arch/arm/mach-spear/headsmp.S     | 11 +++--------
 arch/arm/plat-versatile/headsmp.S |  9 +--------
 2 files changed, 4 insertions(+), 16 deletions(-)

diff --git a/arch/arm/mach-spear/headsmp.S b/arch/arm/mach-spear/headsmp.S
index 96f89436ccf6..32ffc75ff332 100644
--- a/arch/arm/mach-spear/headsmp.S
+++ b/arch/arm/mach-spear/headsmp.S
@@ -10,6 +10,8 @@
 #include <linux/linkage.h>
 #include <linux/init.h>
 
+#include <asm/assembler.h>
+
 	__INIT
 
 /*
@@ -20,10 +22,7 @@
 ENTRY(spear13xx_secondary_startup)
 	mrc	p15, 0, r0, c0, c0, 5
 	and	r0, r0, #15
-	adr	r4, 1f
-	ldmia	r4, {r5, r6}
-	sub	r4, r4, r5
-	add	r6, r6, r4
+	adr_l	r6, spear_pen_release
 pen:	ldr	r7, [r6]
 	cmp	r7, r0
 	bne	pen
@@ -37,8 +36,4 @@ pen:	ldr	r7, [r6]
 	 * should now contain the SVC stack for this core
 	 */
 	b	secondary_startup
-
-	.align
-1:	.long	.
-	.long	spear_pen_release
 ENDPROC(spear13xx_secondary_startup)
diff --git a/arch/arm/plat-versatile/headsmp.S b/arch/arm/plat-versatile/headsmp.S
index 09d9fc30c8ca..cec71853b0b3 100644
--- a/arch/arm/plat-versatile/headsmp.S
+++ b/arch/arm/plat-versatile/headsmp.S
@@ -18,10 +18,7 @@ ENTRY(versatile_secondary_startup)
  ARM_BE8(setend	be)
 	mrc	p15, 0, r0, c0, c0, 5
 	bic	r0, #0xff000000
-	adr	r4, 1f
-	ldmia	r4, {r5, r6}
-	sub	r4, r4, r5
-	add	r6, r6, r4
+	adr_l	r6, versatile_cpu_release
 pen:	ldr	r7, [r6]
 	cmp	r7, r0
 	bne	pen
@@ -31,8 +28,4 @@ pen:	ldr	r7, [r6]
 	 * should now contain the SVC stack for this core
 	 */
 	b	secondary_startup
-
-	.align
-1:	.long	.
-	.long	versatile_cpu_release
 ENDPROC(versatile_secondary_startup)
-- 
2.30.0