Am 13.01.21 um 14:27 schrieb Daniel Vetter:
On Wed, Jan 13, 2021 at 02:13:25PM +0100, Christian König wrote:
The only flag we really need is __GFP_NOMEMALLOC, highmem depends on
dma32 and moveable/compound should never be set in the first place.
Signed-off-by: Christian König <christian.koenig@xxxxxxx>
Needs Fixes: line and References to the GFP_TRANSHUGE_LIGHT report from
Hans and for the chromium report for the mmap fail.
Which tag should I use for this? Just Link:?
With those:
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Also I guess really time for me to stitch together that hack to catch
dma-buf sglist struct page abusers ...
Oh, yes please.
Christian.
-Daniel
---
drivers/gpu/drm/ttm/ttm_pool.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/ttm/ttm_pool.c b/drivers/gpu/drm/ttm/ttm_pool.c
index 8cd776adc592..11e0313db0ea 100644
--- a/drivers/gpu/drm/ttm/ttm_pool.c
+++ b/drivers/gpu/drm/ttm/ttm_pool.c
@@ -79,12 +79,13 @@ static struct page *ttm_pool_alloc_page(struct ttm_pool *pool, gfp_t gfp_flags,
struct page *p;
void *vaddr;
- if (order) {
- gfp_flags |= GFP_TRANSHUGE_LIGHT | __GFP_NORETRY |
+ /* Don't set the __GFP_COMP flag for higher order allocations.
+ * Mapping pages directly into an userspace process and calling
+ * put_page() on a TTM allocated page is illegal.
+ */
+ if (order)
+ gfp_flags |= __GFP_NOMEMALLOC | __GFP_NORETRY |
__GFP_KSWAPD_RECLAIM;
- gfp_flags &= ~__GFP_MOVABLE;
- gfp_flags &= ~__GFP_COMP;
- }
if (!pool->use_dma_alloc) {
p = alloc_pages(gfp_flags, order);
--
2.25.1
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