[PATCH v4 4/5] x86: Clean up current_stack_pointer

[Andy Lutomirski]

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.

Signed-off-by: Andy Lutomirski <l...@amacapital.net>
---
 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 547e344a6dc6..8b13b0fbda8e 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 63ce838e5a54..28d28f5eb8f4 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);
 }
-- 
1.9.3

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