From: Lorenzo Stoakes <lstoakes@gmail.com>
To: linux-mm <linux-mm@kvack.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Paolo Bonzini <pbonzini@redhat.com>,
Michal Hocko <mhocko@kernel.org>, David Airlie <airlied@linux.ie>,
dri-devel@lists.freedesktop.org,
Lorenzo Stoakes <lstoakes@gmail.com>
Subject: Re: [PATCH] drm/via: use get_user_pages_unlocked()
Date: Tue, 3 Jan 2017 20:23:20 +0000 [thread overview]
Message-ID: <CAA5enKai6Gq7gCf6mmuXJwZrds5N8s9JAtNGxy1vAJD1zSmb2Q@mail.gmail.com> (raw)
In-Reply-To: <20161101194337.24015-1-lstoakes@gmail.com>
Hi All,
Just a gentle ping on this one :)
Cheers, Lorenzo
On 1 November 2016 at 19:43, Lorenzo Stoakes <lstoakes@gmail.com> wrote:
> Moving from get_user_pages() to get_user_pages_unlocked() simplifies the code
> and takes advantage of VM_FAULT_RETRY functionality when faulting in pages.
>
> Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com>
> ---
> drivers/gpu/drm/via/via_dmablit.c | 10 +++-------
> 1 file changed, 3 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/via/via_dmablit.c b/drivers/gpu/drm/via/via_dmablit.c
> index 1a3ad76..98aae98 100644
> --- a/drivers/gpu/drm/via/via_dmablit.c
> +++ b/drivers/gpu/drm/via/via_dmablit.c
> @@ -238,13 +238,9 @@ via_lock_all_dma_pages(drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer)
> vsg->pages = vzalloc(sizeof(struct page *) * vsg->num_pages);
> if (NULL == vsg->pages)
> return -ENOMEM;
> - down_read(¤t->mm->mmap_sem);
> - ret = get_user_pages((unsigned long)xfer->mem_addr,
> - vsg->num_pages,
> - (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0,
> - vsg->pages, NULL);
> -
> - up_read(¤t->mm->mmap_sem);
> + ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr,
> + vsg->num_pages, vsg->pages,
> + (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0);
> if (ret != vsg->num_pages) {
> if (ret < 0)
> return ret;
> --
> 2.10.2
>
--
Lorenzo Stoakes
https://ljs.io
next prev parent reply other threads:[~2017-01-03 20:33 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-11-01 19:43 [PATCH] drm/via: use get_user_pages_unlocked() Lorenzo Stoakes
2017-01-03 20:23 ` Lorenzo Stoakes [this message]
2017-01-06 7:09 ` Lorenzo Stoakes
2017-02-20 18:46 ` Lorenzo Stoakes
2017-02-26 19:40 ` Daniel Vetter
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