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| author | Yinghai Lu <yinghai@kernel.org> | 2009-03-24 21:23:16 +0100 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-03-24 22:12:10 +0100 |
| commit | fa74c9073370e57fa28e02aff13f4d7b1806505c (patch) | |
| tree | b86bdbe35d1dc924ea2e789e4f5976cc1a408da5 /arch | |
| parent | Merge branches 'x86/apic', 'x86/cleanups', 'x86/mm', 'x86/pat', 'x86/setup' a... (diff) | |
| download | linux-fa74c9073370e57fa28e02aff13f4d7b1806505c.tar.xz linux-fa74c9073370e57fa28e02aff13f4d7b1806505c.zip | |
x86: fix set_extra_move_desc calling
Impact: fix bug with irq-descriptor moving when logical flat
Rusty observed:
> The effect of setting desc->affinity (ie. from userspace via sysfs) has varied
> over time. In 2.6.27, the 32-bit code anded the value with cpu_online_map,
> and both 32 and 64-bit did that anding whenever a cpu was unplugged.
>
> 2.6.29 consolidated this into one routine (and fixed hotplug) but introduced
> another variation: anding the affinity with cfg->domain. Is this right, or
> should we just set it to what the user said? Or as now, indicate that we're
> restricting it.
Eric pointed out that desc->affinity should be what the user requested,
if it is at all possible to honor the user space request.
This bug got introduced by commit 22f65d31b "x86: Update io_apic.c to use
new cpumask API".
Fix it by moving the masking to before the descriptor moving ...
Reported-by: Rusty Russell <rusty@rustcorp.com.au>
Reported-by: Eric W. Biederman <ebiederm@xmission.com>
LKML-Reference: <49C94134.4000408@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/kernel/apic/io_apic.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/arch/x86/kernel/apic/io_apic.c b/arch/x86/kernel/apic/io_apic.c index 86827d85488a..1ed6c0600cde 100644 --- a/arch/x86/kernel/apic/io_apic.c +++ b/arch/x86/kernel/apic/io_apic.c @@ -592,8 +592,9 @@ set_desc_affinity(struct irq_desc *desc, const struct cpumask *mask) if (assign_irq_vector(irq, cfg, mask)) return BAD_APICID; - cpumask_and(desc->affinity, cfg->domain, mask); + /* check that before desc->addinity get updated */ set_extra_move_desc(desc, mask); + cpumask_and(desc->affinity, cfg->domain, mask); return apic->cpu_mask_to_apicid_and(desc->affinity, cpu_online_mask); } |