From: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Date: Sat, 15 Jul 2017 16:23:13 +0000 (+0100)
Subject: arm64: assembler: allow adr_this_cpu to use the stack pointer
X-Git-Tag: v4.14-rc1~151^2~21^2~4
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=8ea41b11ef746e1ac97f8c90911e5c61f8bd5cc0;p=platform%2Fkernel%2Flinux-exynos.git

arm64: assembler: allow adr_this_cpu to use the stack pointer

Given that adr_this_cpu already requires a temp register in addition
to the destination register, tweak the instruction sequence so that sp
may be used as well.

This will simplify switching to per-cpu stacks in subsequent patches. While
this limits the range of adr_this_cpu, to +/-4GiB, we don't currently use
adr_this_cpu in modules, and this is not problematic for the main kernel image.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[Mark: add more commit text]
Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Will Deacon <will.deacon@arm.com>
Tested-by: Laura Abbott <labbott@redhat.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: James Morse <james.morse@arm.com>
---

diff --git a/arch/arm64/include/asm/assembler.h b/arch/arm64/include/asm/assembler.h
index 610a420..2f2bd51 100644
--- a/arch/arm64/include/asm/assembler.h
+++ b/arch/arm64/include/asm/assembler.h
@@ -230,12 +230,18 @@ lr	.req	x30		// link register
 	.endm
 
 	/*
-	 * @dst: Result of per_cpu(sym, smp_processor_id())
+	 * @dst: Result of per_cpu(sym, smp_processor_id()), can be SP for
+	 *       non-module code
 	 * @sym: The name of the per-cpu variable
 	 * @tmp: scratch register
 	 */
 	.macro adr_this_cpu, dst, sym, tmp
+#ifndef MODULE
+	adrp	\tmp, \sym
+	add	\dst, \tmp, #:lo12:\sym
+#else
 	adr_l	\dst, \sym
+#endif
 	mrs	\tmp, tpidr_el1
 	add	\dst, \dst, \tmp
 	.endm