LLVM doesn't support local named register variables and is unlikely
to. current_thread_info is using one, fix it by moving it out and
calling it __current_r1().
I gave it a bit of an obscure name because we don't want anyone else
using it - they should use current_stack_pointer(). This specific
case is performance critical and we can't afford to call a function
to get it. Furthermore it isn't important to know exactly where in
the stack we are since we mask the lower bits.
Signed-off-by: Anton Blanchard <an...@samba.org>
---
arch/powerpc/include/asm/thread_info.h | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/include/asm/thread_info.h
b/arch/powerpc/include/asm/thread_info.h
index b034ecd..ebc4f16 100644
--- a/arch/powerpc/include/asm/thread_info.h
+++ b/arch/powerpc/include/asm/thread_info.h
@@ -71,13 +71,12 @@ struct thread_info {
#define THREAD_SIZE_ORDER (THREAD_SHIFT - PAGE_SHIFT)
/* how to get the thread information struct from C */
+register unsigned long __current_r1 asm("r1");
static inline struct thread_info *current_thread_info(void)
{
- register unsigned long sp asm("r1");
-
/* gcc4, at least, is smart enough to turn this into a single
* rlwinm for ppc32 and clrrdi for ppc64 */
- return (struct thread_info *)(sp & ~(THREAD_SIZE-1));
+ return (struct thread_info *)(__current_r1 & ~(THREAD_SIZE-1));
}
#endif /* __ASSEMBLY__ */
--
1.9.1
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