linux-kernel - Re: [PATCH] mm: mempolicy: make mbind() return -EIO when MPOL_MF

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Date:   Wed, 20 Mar 2019 16:06:44 -0700
From:   Yang Shi <yang.shi@...ux.alibaba.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Souptick Joarder <jrdr.linux@...il.com>
Cc:     chrubis@...e.cz, Vlastimil Babka <vbabka@...e.cz>,
        kirill@...temov.name, osalvador@...e.de, stable@...r.kernel.org,
        Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] mm: mempolicy: make mbind() return -EIO when
 MPOL_MF_STRICT is specified



On 3/20/19 3:16 PM, Andrew Morton wrote:
> On Wed, 20 Mar 2019 11:23:03 +0530 Souptick Joarder <jrdr.linux@...il.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

> _