From a775a38b1353161a6d7af86b667d6523c12c1a37 Mon Sep 17 00:00:00 2001 From: Mike Travis Date: Wed, 17 Dec 2008 15:21:39 -0800 Subject: x86: fix cpu_mask_to_apicid_and to include cpu_online_mask Impact: fix potential APIC crash In determining the destination apicid, there are usually three cpumasks that are considered: the incoming cpumask arg, cfg->domain and the cpu_online_mask. Since we are just introducing the cpu_mask_to_apicid_and function, make sure it includes the cpu_online_mask in it's evaluation. [Added with this patch.] There are two io_apic.c functions that did not previously use the cpu_online_mask: setup_IO_APIC_irq and msi_compose_msg. Both of these simply used cpu_mask_to_apicid(cfg->domain & TARGET_CPUS), and all but one arch (NUMAQ[*]) returns only online cpus in the TARGET_CPUS mask, so the behavior is identical for all cases. [*: NUMAQ bug?] Note that alloc_cpumask_var is only used for the 32-bit cases where it's highly likely that the cpumask set size will be small and therefore CPUMASK_OFFSTACK=n. But if that's not the case, failing the allocate will cause the same return value as the default. Signed-off-by: Mike Travis Signed-off-by: Ingo Molnar --- arch/x86/kernel/genx2apic_cluster.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) (limited to 'arch/x86/kernel/genx2apic_cluster.c') diff --git a/arch/x86/kernel/genx2apic_cluster.c b/arch/x86/kernel/genx2apic_cluster.c index 4716a0c9f93..d451c9b9fdf 100644 --- a/arch/x86/kernel/genx2apic_cluster.c +++ b/arch/x86/kernel/genx2apic_cluster.c @@ -133,7 +133,9 @@ static unsigned int x2apic_cpu_mask_to_apicid_and(const struct cpumask *cpumask, * We're using fixed IRQ delivery, can only return one phys APIC ID. * May as well be the first. */ - cpu = cpumask_any_and(cpumask, andmask); + for_each_cpu_and(cpu, cpumask, andmask) + if (cpumask_test_cpu(cpu, cpu_online_mask)) + break; if (cpu < nr_cpu_ids) return per_cpu(x86_cpu_to_apicid, cpu); return BAD_APICID; -- cgit v1.2.3