linux-kernel - [PATCH V2 2/6] arm64: LLVMLinux: Use current_stack_pointer in save_stack_trace

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Date:	Tue, 26 Aug 2014 21:29:30 -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 2/6] arm64: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk

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/kernel/stacktrace.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 55437ba..407991b 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -111,10 +111,9 @@ void save_stack_trace_tsk(struct task_struct *tsk, struct stack_trace *trace)
 		frame.sp = thread_saved_sp(tsk);
 		frame.pc = thread_saved_pc(tsk);
 	} else {
-		register unsigned long current_sp asm("sp");
 		data.no_sched_functions = 0;
 		frame.fp = (unsigned long)__builtin_frame_address(0);
-		frame.sp = current_sp;
+		frame.sp = current_stack_pointer;
 		frame.pc = (unsigned long)save_stack_trace_tsk;
 	}
 
-- 
1.9.1

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