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authorAnton Blanchard <anton@samba.org>2014-10-31 14:47:25 +1100
committerMichael Ellerman <mpe@ellerman.id.au>2014-11-10 09:59:31 +1100
commita3e5b356b3ab40b00ecb0f6fde445db719c100b5 (patch)
treea330444b01df40d2f4a403ee61fd0f33623e5949 /arch/powerpc/include
parente88f157de5e0b327b1b26e3260de4b16c07e2d19 (diff)
powerpc: Don't use local named register variable in current_thread_info
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 <anton@samba.org> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/thread_info.h5
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/powerpc/include/asm/thread_info.h b/arch/powerpc/include/asm/thread_info.h
index b034ecdb7c74..ebc4f165690a 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__ */