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Subject[PATCH -mm] slub: fix cpu hotplug offline/online path
This patch fixes the problem introduced by:

I got slub BUG report when I tried to do cpu hotplug/unplug
$ while true; do
echo 0 > /sys/devices/system/cpu/cpu1/online
echo 1 > /sys/devices/system/cpu/cpu1/online

This is because init_alloc_cpu_cpu() is called every time when the CPU is
going to be onlined but init_alloc_cpu_cpu() is not intented to be called
twice or more for same CPU. Then it breaks kmem_cache_cpu_free list for
the CPU.

This patch removes init_alloc_cpu_cpu() from cpu hotplug notifier. But
call it for each possible CPUs not only online CPUs at initialization time.

Cc: Christoph Lameter <>
Signed-off-by: Akinobu Mita <>

mm/slub.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)

Index: 2.6-mm/mm/slub.c
--- 2.6-mm.orig/mm/slub.c
+++ 2.6-mm/mm/slub.c
@@ -2029,7 +2029,7 @@ static int alloc_kmem_cache_cpus(struct
* Initialize the per cpu array.
-static void init_alloc_cpu_cpu(int cpu)
+static void __init init_alloc_cpu_cpu(int cpu)
int i;

@@ -2041,7 +2041,7 @@ static void __init init_alloc_cpu(void)
int cpu;

- for_each_online_cpu(cpu)
+ for_each_possible_cpu(cpu)

@@ -2973,7 +2973,6 @@ static int __cpuinit slab_cpuup_callback
switch (action) {
- init_alloc_cpu_cpu(cpu);
list_for_each_entry(s, &slab_caches, list)
s->cpu_slab[cpu] = alloc_kmem_cache_cpu(s, cpu,
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