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| author | Ian Campbell <Ian.Campbell@eu.citrix.com> | 2009-02-06 16:55:58 -0800 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-02-09 12:18:22 +0100 |
| commit | 90af9514ac99f51e81682c7bec8f9fb88a17a95c (patch) | |
| tree | 479e22492c5821e4386f1a258fa6ea92cde05ad4 /drivers/xen | |
| parent | 3445a8fd7c6868bd9db0d1bea7d6e89004552122 (diff) | |
| download | lwn-90af9514ac99f51e81682c7bec8f9fb88a17a95c.tar.gz lwn-90af9514ac99f51e81682c7bec8f9fb88a17a95c.zip | |
xen: explicitly initialise the cpu field of irq_info
I was seeing a very odd crash on 64 bit in bind_evtchn_to_cpu because
cpu_from_irq(irq) was coming out as -1. I found this was coming direct
from the mk_ipi_info call.
It's not clear to me that this isn't a compiler bug (implicit
initialisation to zero of unsigned shorts in a struct not handled
correctly?).
On the other hand is it true that all event channels start of bound to
CPU 0? If not then -1 might be correct and the various other functions
should cope with this.
Signed-off-by: Ian Campbell <Ian.Campbell@eu.citrix.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'drivers/xen')
| -rw-r--r-- | drivers/xen/events.c | 11 |
1 files changed, 6 insertions, 5 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index e53fd60fe4b8..30963af5dba0 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -115,26 +115,27 @@ static struct irq_info mk_unbound_info(void) static struct irq_info mk_evtchn_info(unsigned short evtchn) { - return (struct irq_info) { .type = IRQT_EVTCHN, .evtchn = evtchn }; + return (struct irq_info) { .type = IRQT_EVTCHN, .evtchn = evtchn, + .cpu = 0 }; } static struct irq_info mk_ipi_info(unsigned short evtchn, enum ipi_vector ipi) { return (struct irq_info) { .type = IRQT_IPI, .evtchn = evtchn, - .u.ipi = ipi }; + .cpu = 0, .u.ipi = ipi }; } static struct irq_info mk_virq_info(unsigned short evtchn, unsigned short virq) { return (struct irq_info) { .type = IRQT_VIRQ, .evtchn = evtchn, - .u.virq = virq }; + .cpu = 0, .u.virq = virq }; } static struct irq_info mk_pirq_info(unsigned short evtchn, unsigned short gsi, unsigned short vector) { return (struct irq_info) { .type = IRQT_PIRQ, .evtchn = evtchn, - .u.pirq = { .gsi = gsi, .vector = vector } }; + .cpu = 0, .u.pirq = { .gsi = gsi, .vector = vector } }; } /* @@ -375,6 +376,7 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) spin_lock(&irq_mapping_update_lock); irq = per_cpu(ipi_to_irq, cpu)[ipi]; + if (irq == -1) { irq = find_unbound_irq(); if (irq < 0) @@ -391,7 +393,6 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu) evtchn_to_irq[evtchn] = irq; irq_info[irq] = mk_ipi_info(evtchn, ipi); - per_cpu(ipi_to_irq, cpu)[ipi] = irq; bind_evtchn_to_cpu(evtchn, cpu); |