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xen: events: Make last processed event channel a per-cpu variable.

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Signed-off-by: Ian Campbell <ian.campbell@citrix.com>
[ijc: forward ported from linux-2.6.18-xen.hg 325:b2768401db94]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
This commit is contained in:
Ian Campbell 2011-03-03 09:29:36 +00:00 committed by Konrad Rzeszutek Wilk
parent ab7f863e41
commit f1f4a323d4
1 changed files with 6 additions and 7 deletions
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13
drivers/xen/events.c
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@ -1026,6 +1026,8 @@ irqreturn_t xen_debug_interrupt(int irq, void *dev_id)
}
static DEFINE_PER_CPU(unsigned, xed_nesting_count);
static DEFINE_PER_CPU(unsigned int, last_word_idx) = { BITS_PER_LONG - 1 };
static DEFINE_PER_CPU(unsigned int, last_bit_idx) = { BITS_PER_LONG - 1 };
/*
* Mask out the i least significant bits of w
@ -1043,8 +1045,6 @@ static DEFINE_PER_CPU(unsigned, xed_nesting_count);
*/
static void __xen_evtchn_do_upcall(void)
{
static unsigned int last_word_idx = BITS_PER_LONG - 1;
static unsigned int last_bit_idx = BITS_PER_LONG - 1;
int word_idx, bit_idx;
int cpu = get_cpu();
struct shared_info *s = HYPERVISOR_shared_info;
@ -1065,8 +1065,8 @@ static void __xen_evtchn_do_upcall(void)
#endif
pending_words = xchg(&vcpu_info->evtchn_pending_sel, 0);
word_idx = last_word_idx;
bit_idx = last_bit_idx;
word_idx = __this_cpu_read(last_word_idx);
bit_idx = __this_cpu_read(last_bit_idx);
while (pending_words != 0) {
unsigned long pending_bits;
@ -1121,9 +1121,8 @@ static void __xen_evtchn_do_upcall(void)
* If this is the final port processed, we'll
* pick up here+1 next time.
*/
last_word_idx = word_idx;
last_bit_idx = bit_idx;
__this_cpu_write(last_word_idx, word_idx);
__this_cpu_write(last_bit_idx, bit_idx);
} while (bit_idx != BITS_PER_LONG - 1);
pending_bits = active_evtchns(cpu, s, word_idx);