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| author | Ian Campbell <ian.campbell@citrix.com> | 2011-03-03 10:29:36 +0100 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-03-10 20:47:56 +0100 |
| commit | f1f4a323d46c90632a4d35d34f1d347ca7cb65f5 (patch) | |
| tree | ce2643d300c77c12c94ea5688a7f9dc8fc3effeb /drivers/xen/events.c | |
| parent | xen: events: Process event channels notifications in round-robin order. (diff) | |
| download | linux-f1f4a323d46c90632a4d35d34f1d347ca7cb65f5.tar.xz linux-f1f4a323d46c90632a4d35d34f1d347ca7cb65f5.zip | |
xen: events: Make last processed event channel a per-cpu variable.
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>
Diffstat (limited to 'drivers/xen/events.c')
| -rw-r--r-- | drivers/xen/events.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/drivers/xen/events.c b/drivers/xen/events.c index 75cc6f50bd29..1fc3192468ef 100644 --- a/drivers/xen/events.c +++ b/drivers/xen/events.c @@ -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); |