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[Xen-changelog] [xen-4.0-testing] kexec: Fix dodgy use of cpu_present_ma

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Subject:	[Xen-changelog] [xen-4.0-testing] kexec: Fix dodgy use of cpu_present_map protecting percpu data access.
From:	"Xen patchbot-4.0-testing" <patchbot-4.0-testing@xxxxxxxxxxxxxxxxxxx>
Date:	Wed, 19 May 2010 12:55:21 -0700
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# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1274298548 -3600
# Node ID 43661ec746246b68f3417e8ce367932185847f37
# Parent  6c99e09a7cd59af4bfeee738d2f4f475aceb6107
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 6c99e09a7cd5 -r 43661ec74624 xen/common/kexec.c
--- a/xen/common/kexec.c        Wed May 19 12:39:30 2010 +0100
+++ b/xen/common/kexec.c        Wed May 19 20:49:08 2010 +0100
@@ -177,7 +177,7 @@ 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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