From: Dario Faggioli <dario.faggioli@citrix.com>
Date: Wed, 3 Aug 2016 12:31:49 +0000 (+0100)
Subject: xen: cpupool: small optimization when moving between pools
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~635
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=f6bde162c4165f7e83f9618cc13dc3aa2af4b6dd;p=xen.git

xen: cpupool: small optimization when moving between pools

If the domain is already where we want it to go,
there's not much to do indeed.

Signed-off-by: Dario Faggioli <dario.faggioli@citrix.com>
Reviewed-by: Juergen Gross <jgross@suse.com>
---

diff --git a/xen/common/cpupool.c b/xen/common/cpupool.c
index 5dacc612d1..999839444e 100644
--- a/xen/common/cpupool.c
+++ b/xen/common/cpupool.c
@@ -232,6 +232,9 @@ static int cpupool_move_domain_locked(struct domain *d, struct cpupool *c)
 {
     int ret;
 
+    if ( unlikely(d->cpupool == c) )
+        return 0;
+
     d->cpupool->n_dom--;
     ret = sched_move_domain(d, c);
     if ( ret )