linux-kernel - Re: [PATCH 1/3] sgi-gru: Convert put_page() to get_user

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Message-ID: <20190722174725.GA12278@bharath12345-Inspiron-5559>
Date:   Mon, 22 Jul 2019 23:17:25 +0530
From:   Bharath Vedartham <linux.bhar@...il.com>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     arnd@...db.de, sivanich@....com, gregkh@...uxfoundation.org,
        ira.weiny@...el.com, jglisse@...hat.com,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH 1/3] sgi-gru: Convert put_page() to get_user_page*()

On Sun, Jul 21, 2019 at 07:25:31PM -0700, John Hubbard wrote:
> On 7/21/19 8:58 AM, Bharath Vedartham wrote:
> > For pages that were retained via get_user_pages*(), release those pages
> > via the new put_user_page*() routines, instead of via put_page().
> > 
> > This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> > ("mm: introduce put_user_page*(), placeholder versions").
> > 
> > Cc: Ira Weiny <ira.weiny@...el.com>
> > Cc: John Hubbard <jhubbard@...dia.com>
> > Cc: Jérôme Glisse <jglisse@...hat.com>
> > Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> > Cc: Dimitri Sivanich <sivanich@....com>
> > Cc: Arnd Bergmann <arnd@...db.de>
> > Cc: linux-kernel@...r.kernel.org
> > Cc: linux-mm@...ck.org
> > Signed-off-by: Bharath Vedartham <linux.bhar@...il.com>
> > ---
> >  drivers/misc/sgi-gru/grufault.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> > 
> 
> Reviewed-by: John Hubbard <jhubbard@...dia.com>
Thanks! 
> thanks,
> -- 
> John Hubbard
> NVIDIA
> 
> > diff --git a/drivers/misc/sgi-gru/grufault.c b/drivers/misc/sgi-gru/grufault.c
> > index 4b713a8..61b3447 100644
> > --- a/drivers/misc/sgi-gru/grufault.c
> > +++ b/drivers/misc/sgi-gru/grufault.c
> > @@ -188,7 +188,7 @@ static int non_atomic_pte_lookup(struct vm_area_struct *vma,
> >  	if (get_user_pages(vaddr, 1, write ? FOLL_WRITE : 0, &page, NULL) <= 0)
> >  		return -EFAULT;
> >  	*paddr = page_to_phys(page);
> > -	put_page(page);
> > +	put_user_page(page);
> >  	return 0;
> >  }
> >  
> >