netdev - Re: [PATCH v4 3/3] net/xdp: convert put_page() to put_user

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Date:   Wed, 31 Jul 2019 08:08:59 +0200
From:   Björn Töpel <bjorn.topel@...el.com>
To:     john.hubbard@...il.com, Andrew Morton <akpm@...ux-foundation.org>
Cc:     Al Viro <viro@...iv.linux.org.uk>,
        Christian Benvenuti <benve@...co.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        "Darrick J . Wong" <darrick.wong@...cle.com>,
        Dave Chinner <david@...morbit.com>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jerome Glisse <jglisse@...hat.com>,
        "Kirill A . Shutemov" <kirill@...temov.name>,
        Matthew Wilcox <willy@...radead.org>,
        Michal Hocko <mhocko@...nel.org>,
        Mike Marciniszyn <mike.marciniszyn@...el.com>,
        Mike Rapoport <rppt@...ux.ibm.com>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-mm@...ck.org, linux-xfs@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>,
        John Hubbard <jhubbard@...dia.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        "David S . Miller" <davem@...emloft.net>, netdev@...r.kernel.org
Subject: Re: [PATCH v4 3/3] net/xdp: convert put_page() to put_user_page*()

On 2019-07-30 22:57, john.hubbard@...il.com wrote:
> From: John Hubbard <jhubbard@...dia.com>
> 
> For pages that were retained via get_user_pages*(), release those pages
> via the new put_user_page*() routines, instead of via put_page() or
> release_pages().
> 
> This is part a tree-wide conversion, as described in commit fc1d8e7cca2d
> ("mm: introduce put_user_page*(), placeholder versions").
> 
> Cc: Björn Töpel <bjorn.topel@...el.com>
> Cc: Magnus Karlsson <magnus.karlsson@...el.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: netdev@...r.kernel.org
> Signed-off-by: John Hubbard <jhubbard@...dia.com>

Acked-by: Björn Töpel <bjorn.topel@...el.com>

> ---
>   net/xdp/xdp_umem.c | 9 +--------
>   1 file changed, 1 insertion(+), 8 deletions(-)
> 
> diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
> index 83de74ca729a..17c4b3d3dc34 100644
> --- a/net/xdp/xdp_umem.c
> +++ b/net/xdp/xdp_umem.c
> @@ -166,14 +166,7 @@ void xdp_umem_clear_dev(struct xdp_umem *umem)
>   
>   static void xdp_umem_unpin_pages(struct xdp_umem *umem)
>   {
> -	unsigned int i;
> -
> -	for (i = 0; i < umem->npgs; i++) {
> -		struct page *page = umem->pgs[i];
> -
> -		set_page_dirty_lock(page);
> -		put_page(page);
> -	}
> +	put_user_pages_dirty_lock(umem->pgs, umem->npgs, true);
>   
>   	kfree(umem->pgs);
>   	umem->pgs = NULL;
>