netdev - Re: [PATCH 3/3] gup: new put_user_page

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Date:   Mon, 22 Jul 2019 12:05:40 -0700
From:   John Hubbard <jhubbard@...dia.com>
To:     <john.hubbard@...il.com>, Andrew Morton <akpm@...ux-foundation.org>
CC:     Alexander Viro <viro@...iv.linux.org.uk>,
        Björn Töpel <bjorn.topel@...el.com>,
        Boaz Harrosh <boaz@...xistor.com>,
        Christoph Hellwig <hch@....de>,
        Daniel Vetter <daniel@...ll.ch>,
        Dan Williams <dan.j.williams@...el.com>,
        Dave Chinner <david@...morbit.com>,
        David Airlie <airlied@...ux.ie>,
        "David S . Miller" <davem@...emloft.net>,
        Ilya Dryomov <idryomov@...il.com>, Jan Kara <jack@...e.cz>,
        Jason Gunthorpe <jgg@...pe.ca>, Jens Axboe <axboe@...nel.dk>,
        Jérôme Glisse <jglisse@...hat.com>,
        Johannes Thumshirn <jthumshirn@...e.de>,
        Magnus Karlsson <magnus.karlsson@...el.com>,
        Matthew Wilcox <willy@...radead.org>,
        Miklos Szeredi <miklos@...redi.hu>,
        Ming Lei <ming.lei@...hat.com>, Sage Weil <sage@...hat.com>,
        Santosh Shilimkar <santosh.shilimkar@...cle.com>,
        Yan Zheng <zyan@...hat.com>, <netdev@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <linux-mm@...ck.org>,
        <linux-rdma@...r.kernel.org>, <bpf@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/3] gup: new put_user_page_dirty*() helpers

On 7/21/19 9:30 PM, john.hubbard@...il.com wrote:
> From: John Hubbard <jhubbard@...dia.com>
> 
> While converting call sites to use put_user_page*() [1], quite a few
> places ended up needing a single-page routine to put and dirty a
> page.
> 
> Provide put_user_page_dirty() and put_user_page_dirty_lock(),
> and use them in a few places: net/xdp, drm/via/, drivers/infiniband.
> 

Please disregard this one, I'm going to drop it, as per the
discussion in patch 1.

thanks,
-- 
John Hubbard
NVIDIA

> Cc: Jason Gunthorpe <jgg@...pe.ca>
> Cc: Jan Kara <jack@...e.cz>
> Signed-off-by: John Hubbard <jhubbard@...dia.com>
> ---
>  drivers/gpu/drm/via/via_dmablit.c        |  2 +-
>  drivers/infiniband/core/umem.c           |  2 +-
>  drivers/infiniband/hw/usnic/usnic_uiom.c |  2 +-
>  include/linux/mm.h                       | 10 ++++++++++
>  net/xdp/xdp_umem.c                       |  2 +-
>  5 files changed, 14 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/via/via_dmablit.c b/drivers/gpu/drm/via/via_dmablit.c
> index 219827ae114f..d30b2d75599f 100644
> --- a/drivers/gpu/drm/via/via_dmablit.c
> +++ b/drivers/gpu/drm/via/via_dmablit.c
> @@ -189,7 +189,7 @@ via_free_sg_info(struct pci_dev *pdev, drm_via_sg_info_t *vsg)
>  		for (i = 0; i < vsg->num_pages; ++i) {
>  			if (NULL != (page = vsg->pages[i])) {
>  				if (!PageReserved(page) && (DMA_FROM_DEVICE == vsg->direction))
> -					put_user_pages_dirty(&page, 1);
> +					put_user_page_dirty(page);
>  				else
>  					put_user_page(page);
>  			}
> diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c
> index 08da840ed7ee..a7337cc3ca20 100644
> --- a/drivers/infiniband/core/umem.c
> +++ b/drivers/infiniband/core/umem.c
> @@ -55,7 +55,7 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d
>  	for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->sg_nents, 0) {
>  		page = sg_page_iter_page(&sg_iter);
>  		if (umem->writable && dirty)
> -			put_user_pages_dirty_lock(&page, 1);
> +			put_user_page_dirty_lock(page);
>  		else
>  			put_user_page(page);
>  	}
> diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
> index 0b0237d41613..d2ded624fb2a 100644
> --- a/drivers/infiniband/hw/usnic/usnic_uiom.c
> +++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
> @@ -76,7 +76,7 @@ static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty)
>  			page = sg_page(sg);
>  			pa = sg_phys(sg);
>  			if (dirty)
> -				put_user_pages_dirty_lock(&page, 1);
> +				put_user_page_dirty_lock(page);
>  			else
>  				put_user_page(page);
>  			usnic_dbg("pa: %pa\n", &pa);
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 0334ca97c584..c0584c6d9d78 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -1061,6 +1061,16 @@ void put_user_pages_dirty(struct page **pages, unsigned long npages);
>  void put_user_pages_dirty_lock(struct page **pages, unsigned long npages);
>  void put_user_pages(struct page **pages, unsigned long npages);
>  
> +static inline void put_user_page_dirty(struct page *page)
> +{
> +	put_user_pages_dirty(&page, 1);
> +}
> +
> +static inline void put_user_page_dirty_lock(struct page *page)
> +{
> +	put_user_pages_dirty_lock(&page, 1);
> +}
> +
>  #if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
>  #define SECTION_IN_PAGE_FLAGS
>  #endif
> diff --git a/net/xdp/xdp_umem.c b/net/xdp/xdp_umem.c
> index 9cbbb96c2a32..1d122e52c6de 100644
> --- a/net/xdp/xdp_umem.c
> +++ b/net/xdp/xdp_umem.c
> @@ -171,7 +171,7 @@ static void xdp_umem_unpin_pages(struct xdp_umem *umem)
>  	for (i = 0; i < umem->npgs; i++) {
>  		struct page *page = umem->pgs[i];
>  
> -		put_user_pages_dirty_lock(&page, 1);
> +		put_user_page_dirty_lock(page);
>  	}
>  
>  	kfree(umem->pgs);
>