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authorYasunori Goto <y-goto@jp.fujitsu.com>2007-10-21 16:41:37 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-22 08:13:17 -0700
commitb9049e234401e1fad8459d69a952b174d76c399d (patch)
tree619adc6533f33379baf25253ff56603b272453c8 /include/linux/memory.h
parent7b78d335ac15b10bbcb0397c635d7f0d569b0270 (diff)
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op-kernel-dev-b9049e234401e1fad8459d69a952b174d76c399d.tar.gz
memory hotplug: make kmem_cache_node for SLUB on memory online avoid panic
Fix a panic due to access NULL pointer of kmem_cache_node at discard_slab() after memory online. When memory online is called, kmem_cache_nodes are created for all SLUBs for new node whose memory are available. slab_mem_going_online_callback() is called to make kmem_cache_node() in callback of memory online event. If it (or other callbacks) fails, then slab_mem_offline_callback() is called for rollback. In memory offline, slab_mem_going_offline_callback() is called to shrink all slub cache, then slab_mem_offline_callback() is called later. [akpm@linux-foundation.org: coding-style fixes] [akpm@linux-foundation.org: locking fix] [akpm@linux-foundation.org: build fix] Signed-off-by: Yasunori Goto <y-goto@jp.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/memory.h')
-rw-r--r--include/linux/memory.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/include/linux/memory.h b/include/linux/memory.h
index ec376e4..33f0ff0 100644
--- a/include/linux/memory.h
+++ b/include/linux/memory.h
@@ -83,10 +83,14 @@ extern int memory_notify(unsigned long val, void *v);
#endif /* CONFIG_MEMORY_HOTPLUG_SPARSE */
+#ifdef CONFIG_MEMORY_HOTPLUG
#define hotplug_memory_notifier(fn, pri) { \
static struct notifier_block fn##_mem_nb = \
{ .notifier_call = fn, .priority = pri }; \
register_memory_notifier(&fn##_mem_nb); \
}
+#else
+#define hotplug_memory_notifier(fn, pri) do { } while (0)
+#endif
#endif /* _LINUX_MEMORY_H_ */
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