From mboxrd@z Thu Jan 1 00:00:00 1970 From: Daniel Vetter Date: Wed, 16 Nov 2022 10:50:57 +0000 Subject: Re: [PATCH mm-unstable v1 17/20] drm/exynos: remove FOLL_FORCE usage Message-Id: List-Id: References: <20221116102659.70287-1-david@redhat.com> <20221116102659.70287-18-david@redhat.com> In-Reply-To: <20221116102659.70287-18-david@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: David Hildenbrand Cc: linux-kernel@vger.kernel.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, etnaviv@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-samsung-soc@vger.kernel.org, linux-rdma@vger.kernel.org, linux-media@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-perf-users@vger.kernel.org, linux-security-module@vger.kernel.org, linux-kselftest@vger.kernel.org, Linus Torvalds , Andrew Morton , Jason Gunthorpe , John Hubbard , Peter Xu , Greg Kroah-Hartman , Andrea Arcangeli , Hugh Dickins , Nadav Amit , Vlastimil Babka , Matthew Wilcox , Mike Kravetz , Muchun Song , Shuah Khan , Lucas Stach , David Airlie , Oded Gabbay , Arnd Bergmann , Christoph Hellwig , Alex Williamson , Inki Dae , Seung-Woo Kim , Kyungmin Park , Daniel Vetter , Krzysztof Kozlowski On Wed, Nov 16, 2022 at 11:26:56AM +0100, David Hildenbrand wrote: > FOLL_FORCE is really only for ptrace access. As we unpin the pinned pages > using unpin_user_pages_dirty_lock(true), the assumption is that all these > pages are writable. > > FOLL_FORCE in this case seems to be a legacy leftover. Let's just remove > it. > > Cc: Inki Dae > Cc: Seung-Woo Kim > Cc: Kyungmin Park > Cc: David Airlie > Cc: Daniel Vetter > Cc: Krzysztof Kozlowski > Signed-off-by: David Hildenbrand Reviewed-by: Daniel Vetter Plus ack for merging through the appropriate non-drm tree. -Daniel > --- > drivers/gpu/drm/exynos/exynos_drm_g2d.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/exynos/exynos_drm_g2d.c b/drivers/gpu/drm/exynos/exynos_drm_g2d.c > index 471fd6c8135f..e19c2ceb3759 100644 > --- a/drivers/gpu/drm/exynos/exynos_drm_g2d.c > +++ b/drivers/gpu/drm/exynos/exynos_drm_g2d.c > @@ -477,7 +477,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d, > } > > ret = pin_user_pages_fast(start, npages, > - FOLL_FORCE | FOLL_WRITE | FOLL_LONGTERM, > + FOLL_WRITE | FOLL_LONGTERM, > g2d_userptr->pages); > if (ret != npages) { > DRM_DEV_ERROR(g2d->dev, > -- > 2.38.1 > -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch