powerpc/ppc64: Remove the unneeded load of ti_flags in resume_kernel
authorKevin Hao <haokexin@gmail.com>
Thu, 26 Sep 2013 08:41:34 +0000 (16:41 +0800)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Fri, 11 Oct 2013 05:49:25 +0000 (16:49 +1100)
We already got the value of current_thread_info and ti_flags and store
them into r9 and r4 respectively before jumping to resume_kernel. So
there is no reason to reload them again.

Signed-off-by: Kevin Hao <haokexin@gmail.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/kernel/entry_64.S

index 889ea2b19383acf14af27be37d9d4f433e2fa517..12679cd43e0c4600c52d87695145760501a78530 100644 (file)
@@ -673,9 +673,7 @@ _GLOBAL(ret_from_except_lite)
 
 resume_kernel:
        /* check current_thread_info, _TIF_EMULATE_STACK_STORE */
-       CURRENT_THREAD_INFO(r9, r1)
-       ld      r8,TI_FLAGS(r9)
-       andis.  r8,r8,_TIF_EMULATE_STACK_STORE@h
+       andis.  r8,r4,_TIF_EMULATE_STACK_STORE@h
        beq+    1f
 
        addi    r8,r1,INT_FRAME_SIZE    /* Get the kprobed function entry */