[Xen-changelog] [xen master] evtchn: reduce the size of the poll_mask where possible

[patchbot@xxxxxxx]

commit b52512634913459cbf1f183e5b7223f01db468bb
Author:     Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
AuthorDate: Thu Jan 22 12:45:13 2015 +0100
Commit:     Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu Jan 22 12:45:13 2015 +0100

    evtchn: reduce the size of the poll_mask where possible
    
    Use domain_max_vcpus(d) in preference to MAX_VIRT_CPUS when allocating the
    poll mask.  This allows x86 HVM guests to have a poll mask of 128 bits 
rather
    than 8k bits.
    
    While changing this, use xzalloc_array() in preference to xmalloc_array() to
    avoid needing the subsequent call to bitmap_zero().
    
    Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
    Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
 xen/common/event_channel.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/xen/common/event_channel.c b/xen/common/event_channel.c
index c0fbcea..4a52f69 100644
--- a/xen/common/event_channel.c
+++ b/xen/common/event_channel.c
@@ -1264,13 +1264,13 @@ int evtchn_init(struct domain *d)
     evtchn_from_port(d, 0)->state = ECS_RESERVED;
 
 #if MAX_VIRT_CPUS > BITS_PER_LONG
-    d->poll_mask = xmalloc_array(unsigned long, BITS_TO_LONGS(MAX_VIRT_CPUS));
+    d->poll_mask = xzalloc_array(unsigned long,
+                                 BITS_TO_LONGS(domain_max_vcpus(d)));
     if ( !d->poll_mask )
     {
         free_evtchn_bucket(d, d->evtchn);
         return -ENOMEM;
     }
-    bitmap_zero(d->poll_mask, MAX_VIRT_CPUS);
 #endif
 
     return 0;
--
generated by git-patchbot for /home/xen/git/xen.git#master

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