Patchwork powerpc/ppc64: remove the unneeded load of ti_flags in resume_kernel

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Submitter Kevin Hao
Date Sept. 26, 2013, 8:41 a.m.
Message ID <1380184894-19862-1-git-send-email-haokexin@gmail.com>
Download mbox | patch
Permalink /patch/278134/
State Accepted
Commit 0edfdd10f57bd989f7c2bc31ce6f601bbee1b664
Delegated to: Benjamin Herrenschmidt
Headers show

Comments

Kevin Hao - Sept. 26, 2013, 8:41 a.m.
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>
---
 arch/powerpc/kernel/entry_64.S | 4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S
index c04cdf7..2fe620f 100644
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -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 */