From: Behan Webster <beh...@converseincode.com>
Use asm to make the globally named register work again for gcc and clang.
Much more efficient than copying the stack pointer to a variable and back again.
Signed-off-by: Behan Webster <beh...@converseincode.com>
---
arch/x86/include/asm/thread_info.h | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)
diff --git a/arch/x86/include/asm/thread_info.h
b/arch/x86/include/asm/thread_info.h
index e1940c0..e27ccc1 100644
--- a/arch/x86/include/asm/thread_info.h
+++ b/arch/x86/include/asm/thread_info.h
@@ -163,10 +163,10 @@ struct thread_info {
*/
#ifndef __ASSEMBLY__
-#define current_stack_pointer ({ \
- unsigned long sp; \
- asm("mov %%esp,%0" : "=g" (sp)); \
- sp; \
+#define current_stack_pointer ({ \
+ register unsigned long sp asm("esp") __used; \
+ asm("" : "=r" (sp)); \
+ sp; \
})
/* how to get the thread information struct from C */
--
1.8.3.2
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