__alloc_percpu() passed GFP_KERNEL implicitly to core function of percpu allocator. At boot phase, it's not valid gfp flag so change it. Without this change, while implementing new feature, I found that __alloc_percpu() calls kmalloc() which is not initialized at this time and the system fail to boot. percpu allocator regards GFP_KERNEL as the sign of the system fully initialized so aggressively try to make spare room. With GFP_NOWAIT, it doesn't do that so succeed to boot. Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx> --- mm/slab.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/mm/slab.c b/mm/slab.c index 65b5dcb..1150c8b 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1990,9 +1990,12 @@ static struct array_cache __percpu *alloc_kmem_cache_cpus( int cpu; size_t size; struct array_cache __percpu *cpu_cache; + gfp_t gfp_flags = GFP_KERNEL; size = sizeof(void *) * entries + sizeof(struct array_cache); - cpu_cache = __alloc_percpu(size, sizeof(void *)); + if (slab_state < FULL) + gfp_flags = GFP_NOWAIT; + cpu_cache = __alloc_percpu_gfp(size, sizeof(void *), gfp_flags); if (!cpu_cache) return NULL; -- 1.7.9.5 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>