Re: [PATCH] mm: mempolicy: make mbind() return -EIO when MPOL_MF_STRICT is specified

Yang Shi
2019-03-20T23:06:55Z

On 3/20/19 3:16 PM, Andrew Morton wrote:
> On Wed, 20 Mar 2019 11:23:03 +0530 Souptick Joarder <jrdr.linux@gmail.com> wrote:
>
>>> --- a/mm/mempolicy.c
>>> +++ b/mm/mempolicy.c
>>> @@ -447,6 +447,13 @@ static inline bool queue_pages_required(struct page *page,
>>> return node_isset(nid, *qp->nmask) == !(flags & MPOL_MF_INVERT);
>>> }
>>>
>>> +/*
>>> + * The queue_pages_pmd() may have three kind of return value.
>>> + * 1 - pages are placed on he right node or queued successfully.
>> Minor typo -> s/he/the ?
> Yes, that comment needs some help. This?
>
> --- a/mm/mempolicy.c~mm-mempolicy-make-mbind-return-eio-when-mpol_mf_strict-is-specified-fix
> +++ a/mm/mempolicy.c
> @@ -429,9 +429,9 @@ static inline bool queue_pages_required(
> }
>
> /*
> - * The queue_pages_pmd() may have three kind of return value.
> - * 1 - pages are placed on he right node or queued successfully.
> - * 0 - THP get split.
> + * queue_pages_pmd() has three possible return values:
> + * 1 - pages are placed on the right node or queued successfully.
> + * 0 - THP was split.
> * -EIO - is migration entry or MPOL_MF_STRICT was specified and an existing
> * page was already on a node that does not follow the policy.
> */

It looks good to me. Thanks, Andrew.

Yang

> _