linux-kernel - Re: [PATCH 02/12] filemap: Use folio_put_refs() in filemap_free

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Date:   Mon, 17 Jan 2022 16:11:48 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     "Kirill A. Shutemov" <kirill@...temov.name>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: [PATCH 02/12] filemap: Use folio_put_refs() in
 filemap_free_folio()

On Mon, Jan 17, 2022 at 06:56:41PM +0300, Kirill A. Shutemov wrote:
> On Sun, Jan 16, 2022 at 12:18:12PM +0000, Matthew Wilcox (Oracle) wrote:
> > +	if (folio_test_large(folio) && !folio_test_hugetlb(folio))
> > +		refs = folio_nr_pages(folio);
> 
> Isn't folio_test_large() check redundant? folio_nr_pages() would return 1
> for non-large folio, wouldn't it?

I'm trying to avoid the function call for !hugetlb pages.