From: Masahiro Yamada <yamada.masahiro@socionext.com>
Date: Fri, 17 Jun 2016 09:32:47 +0000 (+0900)
Subject: arm64: optimize smp_kick_all_cpus
X-Git-Tag: v2016.07-rc3~46
X-Git-Url: https://git.sur5r.net/?a=commitdiff_plain;h=afedf5488de99925f00ead847e40d7ba0d508f0e;p=u-boot

arm64: optimize smp_kick_all_cpus

gic_kick_secondary_cpus can directly return to the caller of
smp_kick_all_cpus.  We do not have to use x29 register here.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: York Sun <york.sun@nxp.com>
---

diff --git a/arch/arm/cpu/armv8/start.S b/arch/arm/cpu/armv8/start.S
index c1a2f456d5..670e323b61 100644
--- a/arch/arm/cpu/armv8/start.S
+++ b/arch/arm/cpu/armv8/start.S
@@ -258,12 +258,10 @@ ENDPROC(lowlevel_init)
 
 WEAK(smp_kick_all_cpus)
 	/* Kick secondary cpus up by SGI 0 interrupt */
-	mov	x29, lr			/* Save LR */
 #if defined(CONFIG_GICV2) || defined(CONFIG_GICV3)
 	ldr	x0, =GICD_BASE
-	bl	gic_kick_secondary_cpus
+	b	gic_kick_secondary_cpus
 #endif
-	mov	lr, x29			/* Restore LR */
 	ret
 ENDPROC(smp_kick_all_cpus)