linux-kernel - Re: [PATCH v2 26/28] gup: Convert compound_range_next() to gup_folio_range

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Date:   Mon, 10 Jan 2022 13:41:39 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Christoph Hellwig <hch@...radead.org>
Cc:     linux-mm@...ck.org, John Hubbard <jhubbard@...dia.com>,
        William Kucharski <william.kucharski@...cle.com>,
        linux-kernel@...r.kernel.org, Jason Gunthorpe <jgg@...pe.ca>
Subject: Re: [PATCH v2 26/28] gup: Convert compound_range_next() to
 gup_folio_range_next()

On Mon, Jan 10, 2022 at 12:41:22AM -0800, Christoph Hellwig wrote:
> On Mon, Jan 10, 2022 at 04:24:04AM +0000, Matthew Wilcox (Oracle) wrote:
> > +static inline struct folio *gup_folio_range_next(unsigned long i,
> >  		unsigned long npages, struct page *start, unsigned int *ntails)
> >  {
> > -	struct page *next, *page;
> > +	struct page *next;
> > +	struct folio *folio;
> >  	unsigned int nr = 1;
> >  
> >  	next = nth_page(start, i);
> > +	folio = page_folio(next);
> 
> Superficial nit:  initialization next and folio at declaration time
> would reada little better.

Done.  Also the previous patch:

-static inline struct page *compound_next(struct page **list,
+static inline struct folio *gup_folio_next(struct page **list,
                unsigned long npages, unsigned long i, unsigned int *ntails)
 {
-       struct page *page;
+       struct folio *folio = page_folio(list[i]);
        unsigned int nr;

-       page = compound_head(list[i]);
        for (nr = i + 1; nr < npages; nr++) {