[Xen-devel] [PATCH 6/8] HACK! evtchn: increase number of buckets to support the FIFO ABI

[David Vrabel <david.vrabel@xxxxxxxxxx>]

From: David Vrabel <david.vrabel@xxxxxxxxxx>

Increase NR_EVTCHN_BUCKETS so 2^17 event channels are possible.  This
required increasing EVTCHN_PER_BUCKET so the bucket list fits into a page.

HACK! because each bucket is now > PAGE_SIZE.

Signed-off-by: David Vrabel <david.vrabel@xxxxxxxxxx>
---
 xen/include/xen/sched.h |    5 +++--
 1 files changed, 3 insertions(+), 2 deletions(-)

diff --git a/xen/include/xen/sched.h b/xen/include/xen/sched.h
index 1e849aa..f825113 100644
--- a/xen/include/xen/sched.h
+++ b/xen/include/xen/sched.h
@@ -51,8 +51,9 @@ extern struct domain *dom0;
 #define BITS_PER_EVTCHN_WORD(d) (has_32bit_shinfo(d) ? 32 : BITS_PER_LONG)
 #endif
 #define MAX_EVTCHNS(d) (BITS_PER_EVTCHN_WORD(d) * BITS_PER_EVTCHN_WORD(d))
-#define EVTCHNS_PER_BUCKET 128
-#define NR_EVTCHN_BUCKETS  (NR_EVENT_CHANNELS / EVTCHNS_PER_BUCKET)
+/* FIXME: this causes each bucket to be > PAGE_SIZE. */
+#define EVTCHNS_PER_BUCKET 256
+#define NR_EVTCHN_BUCKETS  ((1 << EVTCHN_FIFO_LINK_BITS) / EVTCHNS_PER_BUCKET)
 
 struct evtchn
 {
-- 
1.7.2.5


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