linux-kernel - Re: [RFC v1 1/2] fixup for 9947ea2c1e608e32669d5caeb67b3e3fba3309e8 "mm/gup: track FOLL

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Message-Id: <20200228164544.6360f17e@p-imbrenda>
Date:   Fri, 28 Feb 2020 16:45:44 +0100
From:   Claudio Imbrenda <imbrenda@...ux.ibm.com>
To:     linux-next@...r.kernel.org, akpm@...ux-foundation.org
Cc:     borntraeger@...ibm.com, david@...hat.com, aarcange@...hat.com,
        linux-mm@...ck.org, frankja@...ux.ibm.com, sfr@...b.auug.org.au,
        jhubbard@...dia.com, linux-kernel@...r.kernel.org,
        linux-s390@...r.kernel.org
Subject: Re: [RFC v1 1/2] fixup for 9947ea2c1e608e32669d5caeb67b3e3fba3309e8
 "mm/gup: track FOLL_PIN pages"

sorry, this one was a mistake, please ignore


On Fri, 28 Feb 2020 16:43:20 +0100
Claudio Imbrenda <imbrenda@...ux.ibm.com> wrote:

> in case pin fails, we need to unpin, just a put_page will not be
> enough
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>
> ---
>  mm/gup.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/mm/gup.c b/mm/gup.c
> index f589299b0d4a..0b9a806898f3 100644
> --- a/mm/gup.c
> +++ b/mm/gup.c
> @@ -2134,7 +2134,10 @@ static int gup_pte_range(pmd_t pmd, unsigned
> long addr, unsigned long end, goto pte_unmap;
>  
>  		if (unlikely(pte_val(pte) != pte_val(*ptep))) {
> -			put_page(head);
> +			if (flags & FOLL_GET)
> +				put_page(head);
> +			else if (flags & FOLL_PIN)
> +				unpin_user_page(head);
>  			goto pte_unmap;
>  		}
>