Patchwork [2/4] powerpc: Remove static branch prediction in 64bit traced syscall path

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Submitter Anton Blanchard
Date Jan. 8, 2013, 11:47 p.m.
Message ID <20130109104736.063d143b@kryten>
Download mbox | patch
Permalink /patch/210573/
State Accepted
Delegated to: Benjamin Herrenschmidt
Headers show

Comments

Anton Blanchard - Jan. 8, 2013, 11:47 p.m.
Some distros enable auditing by default which forces us through the
syscall trace path. Remove the static branch prediction in our 64bit
syscall handler and let the hardware do the prediction.

Signed-off-by: Anton Blanchard <anton@samba.org>
---

Patch

Index: b/arch/powerpc/kernel/entry_64.S
===================================================================
--- a/arch/powerpc/kernel/entry_64.S
+++ b/arch/powerpc/kernel/entry_64.S
@@ -149,7 +149,7 @@  END_FW_FTR_SECTION_IFSET(FW_FEATURE_SPLP
 	CURRENT_THREAD_INFO(r11, r1)
 	ld	r10,TI_FLAGS(r11)
 	andi.	r11,r10,_TIF_SYSCALL_T_OR_A
-	bne-	syscall_dotrace
+	bne	syscall_dotrace
 .Lsyscall_dotrace_cont:
 	cmpldi	0,r0,NR_syscalls
 	bge-	syscall_enosys