From: Isaku Yamahata <yamahata@valinux.co.jp>
Date: Mon, 28 Jul 2008 08:29:09 +0000 (+0900)
Subject: [IA64] improve __cpu_die()
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~14169
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=10a0215631ac0467bef770cc20f3aaf7e4e37c4c;p=xen.git

[IA64] improve __cpu_die()

use udelay instead of nop loop.
This patch reduces __cpu_die() time much.

Signed-off-by: Isaku Yamahata <yamahata@valinux.co.jp>
---

diff --git a/xen/arch/ia64/linux-xen/smpboot.c b/xen/arch/ia64/linux-xen/smpboot.c
index cb3ee16291..0cc4de2cd5 100644
--- a/xen/arch/ia64/linux-xen/smpboot.c
+++ b/xen/arch/ia64/linux-xen/smpboot.c
@@ -748,9 +748,7 @@ void __cpu_die(unsigned int cpu)
 			return;
 		}
 #ifdef XEN
-		/* XXX: There must be a better way to sleep */
-		for (int j = 0; j < 1000000; j++)
-			cpu_relax();
+		udelay(100 * 1000);
 #else
 		msleep(100);
 #endif