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.
radeon_ttm_tt_pin_userptr() 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@xxxxxxxxxx>
---
drivers/gpu/drm/radeon/radeon_ttm.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
index 9920a6fc11bf..872a98796117 100644
--- a/drivers/gpu/drm/radeon/radeon_ttm.c
+++ b/drivers/gpu/drm/radeon/radeon_ttm.c
@@ -497,9 +497,10 @@ static int radeon_ttm_tt_pin_userptr(struct ttm_tt *ttm)
if (gtt->userflags & RADEON_GEM_USERPTR_ANONONLY) {
/* check that we only pin down 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(gtt->usermm, gtt->userptr);
+ vma = find_vma(gtt->usermm, userptr);
if (!vma || vma->vm_file || vma->vm_end < end)
return -EPERM;
}
--
2.21.0.225.g810b269d1ac-goog
