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Subject:	[Xen-changelog] [xen-unstable] [IA64] Idle domain doesn't need to save and restore fph
From:	Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>
Date:	Sat, 09 Dec 2006 15:42:57 +0000
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# HG changeset patch
# User awilliam@xxxxxxxxxxx
# Node ID 7e7846ea4ab321e6d6b7ad34bbcd808cd2bbcfff
# Parent  b39844e292f66762a02b2080c0f04b5e7bc58ead
[IA64] Idle domain doesn't need to save and restore fph

Signed-off-by: Anthony Xu <anthony.xu@xxxxxxxxx>
---
 xen/arch/ia64/xen/domain.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff -r b39844e292f6 -r 7e7846ea4ab3 xen/arch/ia64/xen/domain.c
--- a/xen/arch/ia64/xen/domain.c        Mon Nov 27 09:26:15 2006 -0700
+++ b/xen/arch/ia64/xen/domain.c        Mon Nov 27 10:10:57 2006 -0700
@@ -164,8 +164,11 @@ void context_switch(struct vcpu *prev, s
 
     local_irq_save(spsr);
 
-    __ia64_save_fpu(prev->arch._thread.fph);
-    __ia64_load_fpu(next->arch._thread.fph);
+    if (!is_idle_domain(prev->domain)) 
+        __ia64_save_fpu(prev->arch._thread.fph);
+    if (!is_idle_domain(next->domain)) 
+        __ia64_load_fpu(next->arch._thread.fph);
+
     if (VMX_DOMAIN(prev)) {
        vmx_save_state(prev);
        if (!VMX_DOMAIN(next)) {

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