From: kaf24@firebug.cl.cam.ac.uk <kaf24@firebug.cl.cam.ac.uk>
Date: Wed, 25 Jan 2006 10:44:39 +0000 (+0100)
Subject: Rev8517 (Reduce locked critical region in __enter_scheduler()), enable
X-Git-Tag: archive/raspbian/4.8.0-1+rpi1~1^2~16531^2~4
X-Git-Url: https://dgit.raspbian.org/%22http:/www.example.com/cgi/%22https:/%22bookmarks://%22Dat/%22http:/www.example.com/cgi/%22https:/%22bookmarks:/%22Dat?a=commitdiff_plain;h=ade3f4d2e3853e4d92555e0bc34280ba27e1c8ee;p=xen.git

Rev8517 (Reduce locked critical region in __enter_scheduler()), enable
interrupt now before context switch. Then arch specific context_switch
stub needs to disable interrupt itself.

To solve some intermittent corruption.

Signed-off-by: Kevin Tian <kevin.tian@intel.com>
---

diff --git a/xen/arch/ia64/xen/xenmisc.c b/xen/arch/ia64/xen/xenmisc.c
index f2d5b708f4..5432ac6bc9 100644
--- a/xen/arch/ia64/xen/xenmisc.c
+++ b/xen/arch/ia64/xen/xenmisc.c
@@ -290,13 +290,9 @@ unsigned long context_switch_count = 0;
 
 void context_switch(struct vcpu *prev, struct vcpu *next)
 {
-//printk("@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@\n");
-//printk("@@@@@@ context switch from domain %d (%x) to domain %d (%x)\n",
-//prev->domain->domain_id,(long)prev&0xffffff,next->domain->domain_id,(long)next&0xffffff);
-//if (prev->domain->domain_id == 1 && next->domain->domain_id == 0) cs10foo();
-//if (prev->domain->domain_id == 0 && next->domain->domain_id == 1) cs01foo();
-//printk("@@sw%d/%x %d->%d\n",smp_processor_id(), hard_smp_processor_id (),
-//       prev->domain->domain_id,next->domain->domain_id);
+    uint64_t spsr;
+
+    local_irq_save(spsr);
     if(VMX_DOMAIN(prev)){
     	vtm_domain_out(prev);
     }
@@ -331,6 +327,7 @@ if (!i--) { printk("+",id); i = 1000000; }
 	    if (vcpu_timer_expired(current)) vcpu_pend_timer(current);
     }
 
+    local_irq_restore(spsr);
     context_saved(prev);
 }