THREAD_START_SP    18 arch/arm/include/asm/thread_info.h #define THREAD_START_SP		(THREAD_SIZE - 8)
THREAD_START_SP    27 arch/c6x/include/asm/thread_info.h #define THREAD_START_SP		(THREAD_SIZE - 8)
THREAD_START_SP    19 arch/unicore32/include/asm/thread_info.h #define THREAD_START_SP		(THREAD_SIZE - 8)