From 83653c16da91112236292871b820cb8b367220e3 Mon Sep 17 00:00:00 2001 From: Andy Lutomirski Date: Thu, 13 Nov 2014 15:57:07 -0800 Subject: [PATCH] x86: Clean up current_stack_pointer There's no good reason for it to be a macro, and x86_64 will want to use it, so it should be in a header. Acked-by: Borislav Petkov Signed-off-by: Andy Lutomirski --- arch/x86/include/asm/thread_info.h | 11 +++++++++++ arch/x86/kernel/irq_32.c | 13 +++---------- 2 files changed, 14 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/thread_info.h b/arch/x86/include/asm/thread_info.h index 547e344..8b13b0fb 100644 --- a/arch/x86/include/asm/thread_info.h +++ b/arch/x86/include/asm/thread_info.h @@ -170,6 +170,17 @@ static inline struct thread_info *current_thread_info(void) return ti; } +static inline unsigned long current_stack_pointer(void) +{ + unsigned long sp; +#ifdef CONFIG_X86_64 + asm("mov %%rsp,%0" : "=g" (sp)); +#else + asm("mov %%esp,%0" : "=g" (sp)); +#endif + return sp; +} + #else /* !__ASSEMBLY__ */ /* how to get the thread information struct from ASM */ diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index 63ce838..28d28f5 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -69,16 +69,9 @@ static void call_on_stack(void *func, void *stack) : "memory", "cc", "edx", "ecx", "eax"); } -/* how to get the current stack pointer from C */ -#define current_stack_pointer ({ \ - unsigned long sp; \ - asm("mov %%esp,%0" : "=g" (sp)); \ - sp; \ -}) - static inline void *current_stack(void) { - return (void *)(current_stack_pointer & ~(THREAD_SIZE - 1)); + return (void *)(current_stack_pointer() & ~(THREAD_SIZE - 1)); } static inline int @@ -103,7 +96,7 @@ execute_on_irq_stack(int overflow, struct irq_desc *desc, int irq) /* Save the next esp at the bottom of the stack */ prev_esp = (u32 *)irqstk; - *prev_esp = current_stack_pointer; + *prev_esp = current_stack_pointer(); if (unlikely(overflow)) call_on_stack(print_stack_overflow, isp); @@ -156,7 +149,7 @@ void do_softirq_own_stack(void) /* Push the previous esp onto the stack */ prev_esp = (u32 *)irqstk; - *prev_esp = current_stack_pointer; + *prev_esp = current_stack_pointer(); call_on_stack(__do_softirq, isp); } -- 2.7.4