__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....@lge.com>
---
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
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