linux-kernel - [PATCH V2 3/6] arm64: LLVMLinux: Calculate current_thread_info from current_stack

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Date:	Tue, 26 Aug 2014 21:29:31 -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,
	Behan Webster <behanw@...verseincode.com>,
	Mark Charlebois <charlebm@...il.com>
Subject: [PATCH V2 3/6] arm64: LLVMLinux: Calculate current_thread_info from current_stack_pointer

From: Behan Webster <behanw@...verseincode.com>

Use the global current_stack_pointer to get the value of the stack pointer.
This change supports being able to compile the kernel with both gcc and clang.

Signed-off-by: Behan Webster <behanw@...verseincode.com>
Signed-off-by: Mark Charlebois <charlebm@...il.com>
Reviewed-by: Jan-Simon Möller <dl9pf@....de>
Reviewed-by: Olof Johansson <olof@...om.net>
Acked-by: Will Deacon <will.deacon@....com>
---
 arch/arm64/include/asm/thread_info.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h
index 356e037..459bf8e 100644
--- a/arch/arm64/include/asm/thread_info.h
+++ b/arch/arm64/include/asm/thread_info.h
@@ -80,8 +80,8 @@ static inline struct thread_info *current_thread_info(void) __attribute_const__;
 
 static inline struct thread_info *current_thread_info(void)
 {
-	register unsigned long sp asm ("sp");
-	return (struct thread_info *)(sp & ~(THREAD_SIZE - 1));
+	return (struct thread_info *)
+		(current_stack_pointer & ~(THREAD_SIZE - 1));
 }
 
 #define thread_saved_pc(tsk)	\
-- 
1.9.1

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