[IA64] iosapic.c: don't direct interrupts to offline cpus

Ignore offline CPUs when registering IOSAPIC interrupts.  We previously
directed interrupts even to offline CPUs, which means that if you have some
unused CPUs (e.g., you used "maxcpus="), some interrupts won't work.

This really hurts because distro installs typically use "maxcpus=1".

Patch by Alex Williamson.

Signed-off-by: Bjorn Helgaas <bjorn.helgaas@hp.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index 51548a8c57e0404d2b507a3b231bcd1585199660..c5b15ddafac20b2c4bb1497b72edbc83b3ec1e9f 100644 (file)
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -521,7 +521,12 @@ get_target_cpu (unsigned int gsi, int vector)
                        goto skip_numa_setup;
 
                cpu_mask = node_to_cpumask(iosapic_lists[iosapic_index].node);
-               
+
+               for_each_cpu_mask(numa_cpu, cpu_mask) {
+                       if (!cpu_online(numa_cpu))
+                               cpu_clear(numa_cpu, cpu_mask);
+               }
+
                num_cpus = cpus_weight(cpu_mask);
 
                if (!num_cpus)