src/patches/suse-2.6.27.25/patches.xen/769-evtchn-CPU-offline.patch

   1 From: http://xenbits.xensource.com/linux-2.6.18-xen.hg?rev/79e82ae1bad0
   2 # HG changeset 769 patch
   3 # User Keir Fraser <keir.fraser@citrix.com>
   4 # Date 1231154982 0
   5 # Node ID 79e82ae1bad02c0dfb504db3153599e52a0affb3
   6 # Parent  cfb171ddbb333df9671a1da62e40122a56213ab4
   7 Subject: evtchn: Fix CPU offlining to switch all affected ports
   8 belonging to a particular /dev/evcthn user.
   9 Patch-mainline: obsolete
  10
  11 Original patch by James Harper <james.harper@bendigoit.com.au>
  12
  13 Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
  14 Acked-by: jbeulich@novell.com
  15
  16 --- head-2009-01-06.orig/drivers/xen/evtchn/evtchn.c    2008-09-01 12:20:11.000000000 +0200
  17 +++ head-2009-01-06/drivers/xen/evtchn/evtchn.c 2009-01-05 12:29:42.000000000 +0100
  18 @@ -497,20 +497,22 @@ static int __cpuinit evtchn_cpu_notify(s
  19  {
  20         int hotcpu = (unsigned long)hcpu;
  21         cpumask_t map = cpu_online_map;
  22 -       int port, newcpu;
  23 +       int i, j, newcpu;
  24         struct per_user_data *u;
  25
  26         switch (action) {
  27         case CPU_DOWN_PREPARE:
  28                 cpu_clear(hotcpu, map);
  29                 spin_lock_irq(&port_user_lock);
  30 -               for (port = 0; port < NR_EVENT_CHANNELS; port++) {
  31 -                       if ((u = port_user[port]) != NULL &&
  32 -                           u->bind_cpu == hotcpu &&
  33 -                           (newcpu = next_bind_cpu(map)) < NR_CPUS) {
  34 -                               rebind_evtchn_to_cpu(port, newcpu);
  35 -                               u->bind_cpu = newcpu;
  36 -                       }
  37 +               for (i = 0; i < NR_EVENT_CHANNELS; i++) {
  38 +                       u = port_user[i];
  39 +                       if ((u == NULL) || (u->bind_cpu != hotcpu))
  40 +                               continue;
  41 +                       newcpu = next_bind_cpu(map);
  42 +                       for (j = i; j < NR_EVENT_CHANNELS; j++)
  43 +                               if (port_user[j] == u)
  44 +                                       rebind_evtchn_to_cpu(j, newcpu);
  45 +                       u->bind_cpu = newcpu;
  46                 }
  47                 spin_unlock_irq(&port_user_lock);
  48                 break;