From: Behan Webster <beh...@converseincode.com>
Use the frame pointer to calculate the start of the stack for
current_thread_info()
The existing code uses the stack pointer to do this calculation.
Using the frame pointer yeilds the same value in a portable way.
This change supports being able to compile the kernel with gcc and Clang.
Signed-off-by: Mark Charlebois <charl...@gmail.com>
Signed-off-by: Behan Webster <beh...@converseincode.com>
Reviewed-by: Jan-Simon Möller <dl...@gmx.de>
---
arch/arm/include/asm/thread_info.h | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/arch/arm/include/asm/thread_info.h
b/arch/arm/include/asm/thread_info.h
index df5e13d..cb50933 100644
--- a/arch/arm/include/asm/thread_info.h
+++ b/arch/arm/include/asm/thread_info.h
@@ -106,8 +106,9 @@ 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 *)
+ ((u32)(__builtin_frame_address(0))
+ & ~(THREAD_SIZE - 1));
}
#define thread_saved_pc(tsk) \
--
1.8.1.2
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