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    Subject[PATCH v2 4/7] arm: LLVMLinux: Use current_stack_pointer in save_stack_trace_tsk
    Date
    From: Behan Webster <behanw@converseincode.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@converseincode.com>
    Signed-off-by: Mark Charlebois <charlebm@gmail.com>
    Reviewed-by: Jan-Simon Möller <dl9pf@gmx.de>
    ---
    arch/arm/kernel/stacktrace.c | 4 +---
    1 file changed, 1 insertion(+), 3 deletions(-)

    diff --git a/arch/arm/kernel/stacktrace.c b/arch/arm/kernel/stacktrace.c
    index f065eb0..92b7237 100644
    --- a/arch/arm/kernel/stacktrace.c
    +++ b/arch/arm/kernel/stacktrace.c
    @@ -134,12 +134,10 @@ static noinline void __save_stack_trace(struct task_struct *tsk,
    frame.pc = thread_saved_pc(tsk);
    #endif
    } else {
    - register unsigned long current_sp asm ("sp");
    -
    /* We don't want this function nor the caller */
    data.skip += 2;
    frame.fp = (unsigned long)__builtin_frame_address(0);
    - frame.sp = current_sp;
    + frame.sp = current_stack_pointer;
    frame.lr = (unsigned long)__builtin_return_address(0);
    frame.pc = (unsigned long)__save_stack_trace;
    }
    --
    1.9.1
    --
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