Patchwork powerpc: Remove static branch hint in giveup_altivec

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Submitter Anton Blanchard
Date May 9, 2011, 7:20 a.m.
Message ID <20110509172019.6733177e@kryten>
Download mbox | patch
Permalink /patch/94738/
State Accepted, archived
Commit ba00ce1d6e08ad06f19f2ac53fd5c60bbe3fbeeb
Delegated to: Benjamin Herrenschmidt
Headers show

Comments

Anton Blanchard - May 9, 2011, 7:20 a.m.
A static branch hint will override dynamic branch prediction on
recent POWER CPUs. Since we are about to use more altivec in the
kernel remove the static hint in giveup_altivec that assumes
a userspace task is using altivec.

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

Patch

Index: linux-powerpc/arch/powerpc/kernel/vector.S
===================================================================
--- linux-powerpc.orig/arch/powerpc/kernel/vector.S	2011-04-24 12:38:26.329650611 +1000
+++ linux-powerpc/arch/powerpc/kernel/vector.S	2011-04-24 12:39:27.850785617 +1000
@@ -102,7 +102,7 @@  _GLOBAL(giveup_altivec)
 	MTMSRD(r5)			/* enable use of VMX now */
 	isync
 	PPC_LCMPI	0,r3,0
-	beqlr-				/* if no previous owner, done */
+	beqlr				/* if no previous owner, done */
 	addi	r3,r3,THREAD		/* want THREAD of task */
 	PPC_LL	r5,PT_REGS(r3)
 	PPC_LCMPI	0,r5,0