From mboxrd@z Thu Jan 1 00:00:00 1970 From: behanw@converseincode.com (behanw at converseincode.com) Date: Fri, 6 Sep 2013 17:28:08 -0400 Subject: [PATCH 2/5] arm: LLVMLinux: use current_stack_pointer for percpu In-Reply-To: <1378502899-1241-1-git-send-email-behanw@converseincode.com> References: <1378502899-1241-1-git-send-email-behanw@converseincode.com> Message-ID: <1378502899-1241-3-git-send-email-behanw@converseincode.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Behan Webster The existing code uses named registers to get the value of the stack pointer. The new current_stack_pointer macro is more readable and allows for a central portable implementation of how to get the stack pointer with ASM. This change supports being able to compile the kernel with both gcc and Clang. Signed-off-by: Mark Charlebois Signed-off-by: Behan Webster Reviewed-by: Jan-Simon M?ller --- arch/arm/include/asm/percpu.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/arm/include/asm/percpu.h b/arch/arm/include/asm/percpu.h index 209e650..629a975 100644 --- a/arch/arm/include/asm/percpu.h +++ b/arch/arm/include/asm/percpu.h @@ -30,14 +30,14 @@ static inline void set_my_cpu_offset(unsigned long off) static inline unsigned long __my_cpu_offset(void) { unsigned long off; - register unsigned long *sp asm ("sp"); + unsigned long sp = current_stack_pointer; /* * Read TPIDRPRW. * We want to allow caching the value, so avoid using volatile and * instead use a fake stack read to hazard against barrier(). */ - asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (*sp)); + asm("mrc p15, 0, %0, c13, c0, 4" : "=r" (off) : "Q" (sp)); return off; } -- 1.8.1.2