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Subject: Re: [PATCH v4 3/3] net/xdp: convert put_page() to put_user_page*()
To:     john.hubbard@gmail.com, Andrew Morton <akpm@linux-foundation.org>
Cc:     Al Viro <viro@zeniv.linux.org.uk>,
        Christian Benvenuti <benve@cisco.com>,
        Christoph Hellwig <hch@infradead.org>,
        Dan Williams <dan.j.williams@intel.com>,
        "Darrick J . Wong" <darrick.wong@oracle.com>,
        Dave Chinner <david@fromorbit.com>,
        Ira Weiny <ira.weiny@intel.com>, Jan Kara <jack@suse.cz>,
        Jason Gunthorpe <jgg@ziepe.ca>, Jens Axboe <axboe@kernel.dk>,
        Jerome Glisse <jglisse@redhat.com>,
        "Kirill A . Shutemov" <kirill@shutemov.name>,
        Matthew Wilcox <willy@infradead.org>,
        Michal Hocko <mhocko@kernel.org>,
        Mike Marciniszyn <mike.marciniszyn@intel.com>,
        Mike Rapoport <rppt@linux.ibm.com>,
        linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org,
        linux-mm@kvack.org, linux-xfs@vger.kernel.org,
        LKML <linux-kernel@vger.kernel.org>,
        John Hubbard <jhubbard@nvidia.com>,
        Magnus Karlsson <magnus.karlsson@intel.com>,
        "David S . Miller" <davem@davemloft.net>, netdev@vger.kernel.org
References: <20190730205705.9018-1-jhubbard@nvidia.com>
 <20190730205705.9018-4-jhubbard@nvidia.com>
From:   =?UTF-8?B?QmrDtnJuIFTDtnBlbA==?= <bjorn.topel@intel.com>
Message-ID: <c1c7b6cd-8f08-0e3f-2f66-557228edabcf@intel.com>
Date:   Wed, 31 Jul 2019 08:08:59 +0200
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On 2019-07-30 22:57, john.hubbard@gmail.com wrote:
> From: John Hubbard <jhubbard@nvidia.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@intel.com>
> Cc: Magnus Karlsson <magnus.karlsson@intel.com>
> Cc: David S. Miller <davem@davemloft.net>
> Cc: netdev@vger.kernel.org
> Signed-off-by: John Hubbard <jhubbard@nvidia.com>

Acked-by: Björn Töpel <bjorn.topel@intel.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;
>