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xen/evtchn: clear secondary CPUs' cpu_evtchn_mask[] after restore 

To bind all event channels to CPU#0, it is not sufficient to set all
of its cpu_evtchn_mask[] bits; all other CPUs also need to get their
bits cleared. Otherwise, evtchn_do_upcall() will start handling
interrupts on CPUs they're not intended to run on, which can be
particularly bad for per-CPU ones.

[ linux-2.6.18-xen.hg 7de7453dee36 ]

Signed-off-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
This commit is contained in:
Jan Beulich 2010-11-16 14:55:33 -08:00 committed by Jeremy Fitzhardinge
parent 7e77506a59
commit 1c6969ec8e
1 changed files with 5 additions and 2 deletions
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7
drivers/xen/events.c
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@ -286,9 +286,9 @@ static void bind_evtchn_to_cpu(unsigned int chn, unsigned int cpu)
static void init_evtchn_cpu_bindings(void)
{
int i;
#ifdef CONFIG_SMP
struct irq_desc *desc;
int i;
/* By default all event channels notify CPU#0. */
for_each_irq_desc(i, desc) {
@ -296,7 +296,10 @@ static void init_evtchn_cpu_bindings(void)
}
#endif
memset(cpu_evtchn_mask(0), ~0, sizeof(struct cpu_evtchn_s));
for_each_possible_cpu(i)
memset(cpu_evtchn_mask(i),
(i == 0) ? ~0 : 0, sizeof(struct cpu_evtchn_s));
}
static inline void clear_evtchn(int port)