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[Xen-changelog] [xen-3.4-testing] kexec: Fix dodgy use of cpu_present_ma

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Subject:	[Xen-changelog] [xen-3.4-testing] kexec: Fix dodgy use of cpu_present_map protecting percpu data access.
From:	"Xen patchbot-3.4-testing" <patchbot-3.4-testing@xxxxxxxxxxxxxxxxxxx>
Date:	Wed, 19 May 2010 12:55:35 -0700
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# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1274298637 -3600
# Node ID 4b52d8aad101b7cafe60504dc5d733e15441d6a2
# Parent  d542f7954a63f0aa75b854fdb95304ac25b114d6
kexec: Fix dodgy use of cpu_present_map protecting percpu data access.

Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
xen-unstable changeset:   21432:f71b641aa327
xen-unstable date:        Wed May 19 18:38:19 2010 +0100
---
 xen/common/kexec.c |    2 +-
 1 files changed, 1 insertion(+), 1 deletion(-)

diff -r d542f7954a63 -r 4b52d8aad101 xen/common/kexec.c
--- a/xen/common/kexec.c        Sat May 15 08:44:53 2010 +0100
+++ b/xen/common/kexec.c        Wed May 19 20:50:37 2010 +0100
@@ -172,7 +172,7 @@ 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_present(nr) )
         return -EINVAL;
 
     nr_bytes += sizeof_note("CORE", sizeof(ELF_Prstatus));

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