From: Behan Webster <[email protected]> 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 <[email protected]> Signed-off-by: Behan Webster <[email protected]> Reviewed-by: Jan-Simon Möller <[email protected]> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
