From 0e63f0151719ee4cb90d85e60c98045099c995e2 Mon Sep 17 00:00:00 2001 From: Christophe Leroy Date: Thu, 20 Feb 2020 22:51:38 +1100 Subject: [PATCH] powerpc: Add current_stack_pointer as a register global current_stack_frame() doesn't return the stack pointer, but the caller's stack frame. See commit bfe9a2cfe91a ("powerpc: Reimplement __get_SP() as a function not a define") and commit acf620ecf56c ("powerpc: Rename __get_SP() to current_stack_pointer()") for details. In some cases this is overkill or incorrect, as it doesn't return the current value of r1. So add a current_stack_pointer register global to get the value of r1 directly. Signed-off-by: Christophe Leroy [mpe: Split out of other patch, tweak change log] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200220115141.2707-2-mpe@ellerman.id.au --- arch/powerpc/include/asm/reg.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h index 1b1ffdba60974..da5cab038e25f 100644 --- a/arch/powerpc/include/asm/reg.h +++ b/arch/powerpc/include/asm/reg.h @@ -1450,6 +1450,8 @@ static inline void mtsrin(u32 val, u32 idx) extern unsigned long current_stack_frame(void); +register unsigned long current_stack_pointer asm("r1"); + extern unsigned long scom970_read(unsigned int address); extern void scom970_write(unsigned int address, unsigned long value); -- 2.39.5