linux-kernel - [PATCH V2 5/6] arm64: LLVMLinux: Use global stack register variable for aarch64

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Date:	Tue, 26 Aug 2014 21:29:33 -0700
From:	behanw@...verseincode.com
To:	ard.biesheuvel@...aro.org, catalin.marinas@....com,
	cl@...ux-foundation.org, jays.lee@...sung.com,
	k.khlebnikov@...sung.com, larry.bassel@...aro.org, olof@...om.net,
	peterz@...radead.org, takahiro.akashi@...aro.org,
	tglx@...utronix.de, tj@...nel.org, will.deacon@....com
Cc:	christoffer.dall@...aro.org, kgene.kim@...sung.com,
	khilman@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org, sungjinn.chung@...sung.com,
	Mark Charlebois <charlebm@...il.com>,
	Behan Webster <behanw@...verseincode.com>
Subject: [PATCH V2 5/6] arm64: LLVMLinux: Use global stack register variable for aarch64

From: Mark Charlebois <charlebm@...il.com>

To support both Clang and GCC, use the global stack register variable vs
a local register variable.

Author: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Signed-off-by: Behan Webster <behanw@...verseincode.com>
---
 arch/arm64/include/asm/percpu.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/percpu.h b/arch/arm64/include/asm/percpu.h
index 453a179..5279e57 100644
--- a/arch/arm64/include/asm/percpu.h
+++ b/arch/arm64/include/asm/percpu.h
@@ -26,13 +26,13 @@ static inline void set_my_cpu_offset(unsigned long off)
 static inline unsigned long __my_cpu_offset(void)
 {
 	unsigned long off;
-	register unsigned long *sp asm ("sp");
 
 	/*
 	 * We want to allow caching the value, so avoid using volatile and
 	 * instead use a fake stack read to hazard against barrier().
 	 */
-	asm("mrs %0, tpidr_el1" : "=r" (off) : "Q" (*sp));
+	asm("mrs %0, tpidr_el1" : "=r" (off) :
+		"Q" (*(const unsigned long *)current_stack_pointer));
 
 	return off;
 }
-- 
1.9.1

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