drm/etnaviv: switch devcoredump allocations to GFP_NOWAIT

The etnaviv devcoredump is created in the GPU reset path, which
must make forward progress to avoid stalling memory reclaim on
unsignalled dma fences. The currently used __GFP_NORETRY does not
prohibit sleeping on direct reclaim, breaking the forward progress
guarantee. Switch to GFP_NOWAIT, which allows background reclaim
to be triggered, but avoids any stalls waiting for direct reclaim.

Signed-off-by: Lucas Stach <[e-mail]>
Reviewed-by: Daniel Vetter <[e-mail]>

drivers/gpu/drm/etnaviv/etnaviv_dump.c

···
 	file_size += sizeof(*iter.hdr) * n_obj;
 
 	/* Allocate the file in vmalloc memory, it's likely to be big */
-	iter.start = __vmalloc(file_size, GFP_KERNEL | __GFP_NOWARN |
-			__GFP_NORETRY);
+	iter.start = __vmalloc(file_size, GFP_NOWAIT);
 	if (!iter.start) {
 		mutex_unlock(&submit->mmu_context->lock);
 		dev_warn(gpu->dev, "failed to allocate devcoredump file\n");
···
 
 	etnaviv_core_dump_header(&iter, ETDUMP_BUF_END, iter.data);
 
-	dev_coredumpv(gpu->dev, iter.start, iter.data - iter.start, GFP_KERNEL);
+	dev_coredumpv(gpu->dev, iter.start, iter.data - iter.start, GFP_NOWAIT);
 }