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

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Message-Id: <20190320151630.9c7c604a96f0a892c29befdc@linux-foundation.org>
Date:   Wed, 20 Mar 2019 15:16:30 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Souptick Joarder <jrdr.linux@...il.com>
Cc:     Yang Shi <yang.shi@...ux.alibaba.com>, 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 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.
  */
_