[Xen-changelog] [xen-unstable] kexec: Fix dodgy use of cpu_present_map protecting percpu data access.

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

# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1274290699 -3600
# Node ID f71b641aa327b587886729958cc316ea13ba2181
# Parent  0b62b250f46ad068805d391c1b61514f7c561853
kexec: Fix dodgy use of cpu_present_map protecting percpu data access.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
 xen/common/kexec.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r 0b62b250f46a -r f71b641aa327 xen/common/kexec.c
--- a/xen/common/kexec.c        Wed May 19 17:07:07 2010 +0100
+++ b/xen/common/kexec.c        Wed May 19 18:38:19 2010 +0100
@@ -271,7 +271,7 @@ static int kexec_get_cpu(xen_kexec_range
     int nr = range->nr;
     int nr_bytes = 0;
 
-    if ( nr < 0 || nr >= num_present_cpus() )
+    if ( nr < 0 || nr >= NR_CPUS || !cpu_online(nr) )
         return -EINVAL;
 
     nr_bytes += sizeof_note("CORE", sizeof(ELF_Prstatus));

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