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[IA64] SN: validate smp_affinity mask on intr redirect

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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>
This commit is contained in:
John Keller
2007-05-10 22:42:44 -07:00
committed by Tony Luck
parent 3e3d327702
commit 25d61578da
3 changed files with 24 additions and 0 deletions
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11
arch/ia64/kernel/irq.c
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@@ -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