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| author | David Rientjes <rientjes@google.com> | 2011-06-22 18:13:04 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-06-22 21:06:48 -0700 |
| commit | f957db4fcdd8f03e186aa8f041f4049e76ab741c (patch) | |
| tree | 34c5868d819fad1b831e72ca600e655a7b9d8872 /mm/memory_hotplug.c | |
| parent | 7553e8f2d5161a2b7a9b7a9f37be1b77e735552f (diff) | |
| download | lwn-f957db4fcdd8f03e186aa8f041f4049e76ab741c.tar.gz lwn-f957db4fcdd8f03e186aa8f041f4049e76ab741c.zip | |
mm, hotplug: protect zonelist building with zonelists_mutex
Commit 959ecc48fc75 ("mm/memory_hotplug.c: fix building of node hotplug
zonelist") does not protect the build_all_zonelists() call with
zonelists_mutex as needed. This can lead to races in constructing
zonelist ordering if a concurrent build is underway. Protecting this
with lock_memory_hotplug() is insufficient since zonelists can be
rebuild though sysfs as well.
Signed-off-by: David Rientjes <rientjes@google.com>
Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory_hotplug.c')
| -rw-r--r-- | mm/memory_hotplug.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index 78dba9f04b5b..c46887b5a11e 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -498,7 +498,9 @@ static pg_data_t __ref *hotadd_new_pgdat(int nid, u64 start) * The node we allocated has no zone fallback lists. For avoiding * to access not-initialized zonelist, build here. */ + mutex_lock(&zonelists_mutex); build_all_zonelists(NULL); + mutex_unlock(&zonelists_mutex); return pgdat; } |