[IA64] SN: Add support for CPU disable

Add additional support for CPU disable on SN platforms.
Correctly setup the smp_affinity mask for I/O error IRQs.
Restrict the use of the feature to Altix 4000 and 450 systems
running with a CPU disable capable PROM, and do not allow disabling
of CPU 0.

Signed-off-by: John Keller <jpk@sgi.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 10 insertions, 4 deletions

diff --git a/arch/ia64/sn/kernel/huberror.c b/arch/ia64/sn/kernel/huberror.c
index 2c3f9dfca78b..b663168da55c 100644
--- a/arch/ia64/sn/kernel/huberror.c
+++ b/arch/ia64/sn/kernel/huberror.c
@@ -185,11 +185,14 @@ void hubiio_crb_error_handler(struct hubdev_info *hubdev_info)
  */
 void hub_error_init(struct hubdev_info *hubdev_info)
 {
+
         if (request_irq(SGI_II_ERROR, hub_eint_handler, IRQF_SHARED,
-                        "SN_hub_error", (void *)hubdev_info))
+                        "SN_hub_error", (void *)hubdev_info)) {
                 printk("hub_error_init: Failed to request_irq for 0x%p\n",
                     hubdev_info);
-        return;
+                return;
+        }
+        sn_set_err_irq_affinity(SGI_II_ERROR);
 }
 
 
@@ -202,11 +205,14 @@ void hub_error_init(struct hubdev_info *hubdev_info)
  */
 void ice_error_init(struct hubdev_info *hubdev_info)
 {
+
         if (request_irq
             (SGI_TIO_ERROR, (void *)hub_eint_handler, IRQF_SHARED, "SN_TIO_error",
-             (void *)hubdev_info))
+             (void *)hubdev_info)) {
                 printk("ice_error_init: request_irq() error hubdev_info 0x%p\n",
                        hubdev_info);
-        return;
+                return;
+        }
+        sn_set_err_irq_affinity(SGI_TIO_ERROR);
 }