linux-kernel - [PATCH v2 5/7] arm: LLVMLinux: Calculate current_thread_info from current_stack

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Date:	Fri,  5 Sep 2014 17:06:15 -0700
From:	behanw@...verseincode.com
To:	a.ryabinin@...sung.com, anurag19aggarwal@...il.com,
	charlebm@...il.com, cl@...ux-foundation.org, dave.long@...aro.org,
	k.khlebnikov@...sung.com, linux@....linux.org.uk,
	linyongting@...il.com, Nikolay.Borisov@....com, tglx@...utronix.de,
	tj@...nel.org, u.kleine-koenig@...gutronix.de
Cc:	behanw@...verseincode.com, Dave.Martin@....com,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	rabin@....in, rostedt@...dmis.org, rric@...nel.org,
	will.deacon@....com
Subject: [PATCH v2 5/7] arm: 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>
---
 arch/arm/include/asm/thread_info.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/arm/include/asm/thread_info.h b/arch/arm/include/asm/thread_info.h
index bb43515..b9dc3dc 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -112,8 +112,8 @@ 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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