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Date: Wed, 20 Mar 2019 15:51:28 +0100 From: Andrey Konovalov <andreyknvl@...gle.com> To: Catalin Marinas <catalin.marinas@....com>, Will Deacon <will.deacon@....com>, Mark Rutland <mark.rutland@....com>, Robin Murphy <robin.murphy@....com>, Kees Cook <keescook@...omium.org>, Kate Stewart <kstewart@...uxfoundation.org>, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Andrew Morton <akpm@...ux-foundation.org>, Ingo Molnar <mingo@...nel.org>, "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>, Shuah Khan <shuah@...nel.org>, Vincenzo Frascino <vincenzo.frascino@....com>, Eric Dumazet <edumazet@...gle.com>, "David S. Miller" <davem@...emloft.net>, Alexei Starovoitov <ast@...nel.org>, Daniel Borkmann <daniel@...earbox.net>, Steven Rostedt <rostedt@...dmis.org>, Ingo Molnar <mingo@...hat.com>, Peter Zijlstra <peterz@...radead.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Alex Deucher <alexander.deucher@....com>, "Christian König" <christian.koenig@....com>, "David (ChunMing) Zhou" <David1.Zhou@....com>, Yishai Hadas <yishaih@...lanox.com>, Mauro Carvalho Chehab <mchehab@...nel.org>, Jens Wiklander <jens.wiklander@...aro.org>, Alex Williamson <alex.williamson@...hat.com>, linux-arm-kernel@...ts.infradead.org, linux-mm@...ck.org, linux-arch@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org, amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, linux-rdma@...r.kernel.org, linux-media@...r.kernel.org, kvm@...r.kernel.org, linux-kselftest@...r.kernel.org, linux-kernel@...r.kernel.org Cc: Dmitry Vyukov <dvyukov@...gle.com>, Kostya Serebryany <kcc@...gle.com>, Evgeniy Stepanov <eugenis@...gle.com>, Lee Smith <Lee.Smith@....com>, Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>, Jacob Bramley <Jacob.Bramley@....com>, Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>, Chintan Pandya <cpandya@...eaurora.org>, Luc Van Oostenryck <luc.vanoostenryck@...il.com>, Dave Martin <Dave.Martin@....com>, Kevin Brodsky <kevin.brodsky@....com>, Szabolcs Nagy <Szabolcs.Nagy@....com>, Andrey Konovalov <andreyknvl@...gle.com> Subject: [PATCH v13 14/20] drm/amdgpu, arm64: untag user pointers in amdgpu_ttm_tt_get_user_pages This patch is a part of a series that extends arm64 kernel ABI to allow to pass tagged user pointers (with the top byte set to something else other than 0x00) as syscall arguments. amdgpu_ttm_tt_get_user_pages() uses provided user pointers for vma lookups, which can only by done with untagged pointers. Untag user pointers in this function. Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com> --- drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c index 73e71e61dc99..891b027fa33b 100644 --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -751,10 +751,11 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages) * check that we only use anonymous memory to prevent problems * with writeback */ - unsigned long end = gtt->userptr + ttm->num_pages * PAGE_SIZE; + unsigned long userptr = untagged_addr(gtt->userptr); + unsigned long end = userptr + ttm->num_pages * PAGE_SIZE; struct vm_area_struct *vma; - vma = find_vma(mm, gtt->userptr); + vma = find_vma(mm, userptr); if (!vma || vma->vm_file || vma->vm_end < end) { up_read(&mm->mmap_sem); return -EPERM; -- 2.21.0.225.g810b269d1ac-goog
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