linux-kernel - Re: [PATCH next] mm/migrate: fix remove_migration

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Message-ID: <561c5d85-93fa-3926-2d3d-30f83e99ab5c@google.com>
Date:   Mon, 28 Feb 2022 14:18:39 -0800 (PST)
From:   Hugh Dickins <hughd@...gle.com>
To:     Matthew Wilcox <willy@...radead.org>
cc:     Hugh Dickins <hughd@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH next] mm/migrate: fix remove_migration_pte() of hugetlb
 entry

On Mon, 28 Feb 2022, Matthew Wilcox wrote:
> On Sat, Feb 26, 2022 at 06:25:15PM -0800, Hugh Dickins wrote:
> > -		if (!folio_test_ksm(folio))
> > +		/* Skip call in common case, plus .pgoff is invalid for KSM */
> > +		if (pvmw.nr_pages != 1 && !folio_test_hugetlb(folio))
> >  			idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;
> 
> How do you feel about this instead?
> 
> -               if (!folio_test_ksm(folio))
> +               /* pgoff is invalid for ksm pages, but they are never large */
> +               if (folio_test_large(folio) && !folio_test_hugetlb(folio))
>                         idx = linear_page_index(vma, pvmw.address) - pvmw.pgoff;
> 

That looks nicer to me too.  I'll assume that's what you will add
or squash in your tree, and no need for me to resend - thanks.

Hugh