lkml.org 
[lkml]   [2017]   [Sep]   [1]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH V13 4/4] powerpc/vphn: Fix numa update end-loop bug
Date
powerpc/vphn: On Power systems with shared configurations of CPUs
and memory, there are some issues with the association of additional
CPUs and memory to nodes when hot-adding resources. This patch
fixes an end-of-updates processing problem observed occasionally
in numa_update_cpu_topology().

Signed-off-by: Michael Bringmann <mwb@linux.vnet.ibm.com>
---
arch/powerpc/mm/numa.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 3a5b334..fccf23f 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -1410,6 +1410,13 @@ int numa_update_cpu_topology(bool cpus_locked)
cpu = cpu_last_thread_sibling(cpu);
}

+ /*
+ * Prevent processing of 'updates' from overflowing array
+ * in cases where last entry filled in a 'next' pointer.
+ */
+ if (i)
+ updates[i-1].next = NULL;
+
pr_debug("Topology update for the following CPUs:\n");
if (cpumask_weight(&updated_cpus)) {
for (ud = &updates[0]; ud; ud = ud->next) {
\
 
 \ /
  Last update: 2017-09-01 17:49    [W:0.111 / U:0.680 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site