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Date: Tue, 28 Feb 2017 19:35:39 +0000 From: Al Viro <viro@...IV.linux.org.uk> To: Lorenzo Stoakes <lstoakes@...il.com>, linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org, linux-mm@...ck.org Subject: Re: [PATCH RESEND] drm/via: use get_user_pages_unlocked() On Tue, Feb 28, 2017 at 10:01:10AM +0100, Daniel Vetter wrote: > > + ret = get_user_pages_unlocked((unsigned long)xfer->mem_addr, > > + vsg->num_pages, vsg->pages, > > + (vsg->direction == DMA_FROM_DEVICE) ? FOLL_WRITE : 0); Umm... Why not ret = get_user_pages_fast((unsigned long)xfer->mem_addr, vsg->num_pages, vsg->direction == DMA_FROM_DEVICE, vsg->pages); IOW, do you really need a warranty that ->mmap_sem will be grabbed and released?
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