[Xen-devel] [PATCH] Fix cpu offline bug

["Liu, Jinsong" <jinsong.liu@xxxxxxxxx>]

Fix cpu offline bug

At current xen, when cpu offline, cpu0 will wait the 1st cpu offline;
However, if offline 2nd, 3rd, ... cpu, cpu0 will not wait it.
This patch is used to fix the bug.

Signed-off-by: Liu, Jinsong <jinsong.liu@xxxxxxxxx>

diff -r d1631540bcc4 xen/arch/x86/smpboot.c
--- a/xen/arch/x86/smpboot.c    Tue Jan 18 17:23:24 2011 +0000
+++ b/xen/arch/x86/smpboot.c    Sat Feb 12 03:48:09 2011 +0800
@@ -78,7 +78,8 @@ static enum cpu_state {
     CPU_STATE_INIT,     /* master -> slave: Early bringup phase 1 */
     CPU_STATE_CALLOUT,  /* master -> slave: Early bringup phase 2 */
     CPU_STATE_CALLIN,   /* slave -> master: Completed phase 2 */
-    CPU_STATE_ONLINE    /* master -> slave: Go fully online now. */
+    CPU_STATE_ONLINE,   /* master -> slave: Go fully online now. */
+    CPU_STATE_STAY      /* after slave dead, global cpu_state stay here */
 } cpu_state;
 #define set_cpu_state(state) do { mb(); cpu_state = (state); } while (0)
 
@@ -867,6 +868,8 @@ void __cpu_die(unsigned int cpu)
         if ( (++i % 10) == 0 )
             printk(KERN_ERR "CPU %u still not dead...\n", cpu);
     }
+
+    set_cpu_state(CPU_STATE_STAY);
 }
 
 int cpu_add(uint32_t apic_id, uint32_t acpi_id, uint32_t pxm)

Attachment: cpuoffline_fix_1.bug
Description: cpuoffline_fix_1.bug

_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-devel