Re: [PATCH] mm, memcg: fix error return value of mem_cgroup_alloc()

[Matthew Wilcox <willy@xxxxxxxxxxxxx>]

On Mon, Apr 06, 2020 at 10:09:55PM +0800, Yafang Shao wrote:
> What about ida_alloc_range() ? Should we correct it as well ?
> 
> 
> * Return: The allocated ID, or %-ENOMEM if memory could not be allocated,
> * or %-ENOSPC if there are no free IDs.
> */
> int ida_alloc_range(struct ida *ida, unsigned int min, unsigned int max,
>                         gfp_t gfp)
> 
> If there're no free IDs, ida_alloc_range() also returns ENOSPC.

Do you want to check all the callers of ida_.*alloc()?