diff options
| author | Mike Travis <travis@sgi.com> | 2008-12-17 15:21:39 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-12-18 11:59:24 +0100 |
| commit | a775a38b1353161a6d7af86b667d6523c12c1a37 (patch) | |
| tree | 3bb16b2345b1090bacbd06c64ca62298a5fc23d6 /arch/x86/kernel/genapic_flat_64.c | |
| parent | 9a3d8f735eee90bb5b1351983e946bc637041c01 (diff) | |
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 <travis@sgi.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/kernel/genapic_flat_64.c')
| -rw-r--r-- | arch/x86/kernel/genapic_flat_64.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/genapic_flat_64.c b/arch/x86/kernel/genapic_flat_64.c index 7fa5f49c2dda..34185488e4fb 100644 --- a/arch/x86/kernel/genapic_flat_64.c +++ b/arch/x86/kernel/genapic_flat_64.c @@ -276,7 +276,9 @@ physflat_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; |