[Xen-changelog] [xen-unstable] [powerpc] Use new method to detect NULL xencomm handle

[Xen patchbot-unstable <patchbot-unstable@xxxxxxxxxxxxxxxxxxx>]

# HG changeset patch
# User Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
# Node ID 7c3a27bb291eba0f70baedd2f78d9bf5db553d0b
# Parent  a438506e241df054ba801fa08fe833005102aba9
[powerpc] Use new method to detect NULL xencomm handle

old method wasted cycles and could give false positive.

Signed-off-by: Jimi Xenidis <jimix@xxxxxxxxxxxxxx>
---
 xen/arch/powerpc/usercopy.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff -r a438506e241d -r 7c3a27bb291e xen/arch/powerpc/usercopy.c
--- a/xen/arch/powerpc/usercopy.c       Fri Jul 28 13:00:57 2006 +0100
+++ b/xen/arch/powerpc/usercopy.c       Thu Jul 27 18:57:34 2006 -0400
@@ -238,5 +238,5 @@ int xencomm_handle_is_null(void *ptr)
 
     desc = (struct xencomm_desc *)paddr_to_maddr((unsigned long)ptr);
 
-    return (desc->address[0] == XENCOMM_INVALID);
-}
+    return (desc->nr_addrs == 0);
+}

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