netdev - Re: [PATCH v3 11/23] IB/{core,hw,umem}: set FOLL_PIN, FOLL_LONGTERM via pin_longterm

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Date:   Tue, 12 Nov 2019 16:44:49 -0400
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     John Hubbard <jhubbard@...dia.com>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        Alex Williamson <alex.williamson@...hat.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Björn Töpel <bjorn.topel@...el.com>,
        Christoph Hellwig <hch@...radead.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ira Weiny <ira.weiny@...el.com>, Jan Kara <jack@...e.cz>,
        Jens Axboe <axboe@...nel.dk>, Jonathan Corbet <corbet@....net>,
        Jérôme Glisse <jglisse@...hat.com>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Michal Hocko <mhocko@...e.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Paul Mackerras <paulus@...ba.org>,
        Shuah Khan <shuah@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>, bpf@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, kvm@...r.kernel.org,
        linux-block@...r.kernel.org, linux-doc@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-kselftest@...r.kernel.org,
        linux-media@...r.kernel.org, linux-rdma@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, netdev@...r.kernel.org,
        linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 11/23] IB/{core,hw,umem}: set FOLL_PIN, FOLL_LONGTERM
 via pin_longterm_pages*()

On Mon, Nov 11, 2019 at 04:06:48PM -0800, John Hubbard wrote:
> @@ -542,7 +541,7 @@ static int ib_umem_odp_map_dma_single_page(
>  	}
>  
>  out:
> -	put_user_page(page);
> +	put_page(page);
>  
>  	if (remove_existing_mapping) {
>  		ib_umem_notifier_start_account(umem_odp);
> @@ -639,13 +638,14 @@ int ib_umem_odp_map_dma_pages(struct ib_umem_odp *umem_odp, u64 user_virt,
>  		/*
>  		 * Note: this might result in redundent page getting. We can
>  		 * avoid this by checking dma_list to be 0 before calling
> -		 * get_user_pages. However, this make the code much more
> -		 * complex (and doesn't gain us much performance in most use
> -		 * cases).
> +		 * get_user_pages. However, this makes the code much
> +		 * more complex (and doesn't gain us much performance in most
> +		 * use cases).
>  		 */
>  		npages = get_user_pages_remote(owning_process, owning_mm,
> -				user_virt, gup_num_pages,
> -				flags, local_page_list, NULL, NULL);
> +					       user_virt, gup_num_pages,
> +					       flags, local_page_list, NULL,
> +					       NULL);
>  		up_read(&owning_mm->mmap_sem);

This is just whitespace churn? Drop it..

Jason