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authorJohn Keller <jpk@sgi.com>2007-05-10 22:42:44 -0700
committerTony Luck <tony.luck@intel.com>2007-05-11 09:35:38 -0700
commit25d61578daae697c4a0eb817f42a868af9824f82 (patch)
treeec4ac10132f0b12a822dba6a53d05bab78ec3760 /arch/ia64/kernel/irq.c
parent3e3d32770204ea24cf71919a90d9ccfc2bd407dd (diff)
downloadblackbird-op-linux-25d61578daae697c4a0eb817f42a868af9824f82.tar.gz
blackbird-op-linux-25d61578daae697c4a0eb817f42a868af9824f82.zip
[IA64] SN: validate smp_affinity mask on intr redirect
On SN, only allow one bit to be set in the smp_affinty mask when redirecting an interrupt. Currently setting multiple bits is allowed, but only the first bit is used in determining the CPU to redirect to. This has caused confusion among some customers. [akpm@linux-foundation.org: fixes] Signed-off-by: John Keller <jpk@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/irq.c')
-rw-r--r--arch/ia64/kernel/irq.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
index ce49c85c928f..b4c239685d2e 100644
--- a/arch/ia64/kernel/irq.c
+++ b/arch/ia64/kernel/irq.c
@@ -104,6 +104,17 @@ void set_irq_affinity_info (unsigned int irq, int hwid, int redir)
irq_redir[irq] = (char) (redir & 0xff);
}
}
+
+bool is_affinity_mask_valid(cpumask_t cpumask)
+{
+ if (ia64_platform_is("sn2")) {
+ /* Only allow one CPU to be specified in the smp_affinity mask */
+ if (cpus_weight(cpumask) != 1)
+ return false;
+ }
+ return true;
+}
+
#endif /* CONFIG_SMP */
#ifdef CONFIG_HOTPLUG_CPU
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