[patch 4/8] x86_64:Fix cluster mode send_IPI_allbutself to use get_cpu()/put_cpu()

[Ashok Raj <ashok.raj@intel.com>]

Need to ensure we dont get prempted when we clear ourself from mask when using
clustered mode genapic code.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>
---------------------------------------------------------
 arch/x86_64/kernel/genapic_cluster.c |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletion(-)

Index: linux-2.6.13-rc4-mm1/arch/x86_64/kernel/genapic_cluster.c
===================================================================
--- linux-2.6.13-rc4-mm1.orig/arch/x86_64/kernel/genapic_cluster.c
+++ linux-2.6.13-rc4-mm1/arch/x86_64/kernel/genapic_cluster.c
@@ -72,10 +72,14 @@ static void cluster_send_IPI_mask(cpumas
 static void cluster_send_IPI_allbutself(int vector)
 {
 	cpumask_t mask = cpu_online_map;
-	cpu_clear(smp_processor_id(), mask);
+	int me = get_cpu(); /* Ensure we are not preempted when we clear */
+
+	cpu_clear(me, mask);
 
 	if (!cpus_empty(mask))
 		cluster_send_IPI_mask(mask, vector);
+
+	put_cpu();
 }
 
 static void cluster_send_IPI_all(int vector)

--

-
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