Re: [PATCH] mm/memcontrol.c: add memory allocation result check

[Michal Hocko]

On Mon 30-05-16 16:45:51, Wenwei Tao wrote:
> From: Wenwei Tao <ww.tao0320@xxxxxxxxx>
> 
> The mem_cgroup_tree_per_node allocation might fail,
> check that before continue the memcg init. Since it
> is in the init phase, trigger the panic if that failure
> happens.

We would blow up in the very same function so what is the point of the
explicit BUG_ON?

> Signed-off-by: Wenwei Tao <ww.tao0320@xxxxxxxxx>
> ---
>  mm/memcontrol.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/mm/memcontrol.c b/mm/memcontrol.c
> index 925b431..6385c62 100644
> --- a/mm/memcontrol.c
> +++ b/mm/memcontrol.c
> @@ -5712,6 +5712,7 @@ static int __init mem_cgroup_init(void)
>  
>  		rtpn = kzalloc_node(sizeof(*rtpn), GFP_KERNEL,
>  				    node_online(node) ? node : NUMA_NO_NODE);
> +		BUG_ON(!rtpn);
>  
>  		for (zone = 0; zone < MAX_NR_ZONES; zone++) {
>  			struct mem_cgroup_tree_per_zone *rtpz;
> -- 
> 1.8.3.1
> 
> 
> --
> To unsubscribe, send a message with 'unsubscribe linux-mm' in
> the body to majordomo@xxxxxxxxxx  For more info on Linux MM,
> see: http://www.linux-mm.org/ .
> Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>

-- 
Michal Hocko
SUSE Labs