[PATCH v2] drm/etnaviv: switch devcoredump allocations to GFP_NOWAIT

[Lucas Stach]

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 <l.stach at pengutronix.de>
Reviewed-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
v2: drop __GFP_NORWARN, as it's already part of GFP_NOWAIT
---
 drivers/gpu/drm/etnaviv/etnaviv_dump.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_dump.c b/drivers/gpu/drm/etnaviv/etnaviv_dump.c
index 898f84a0fc30..2cd223461eba 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_dump.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_dump.c
@@ -159,8 +159,7 @@ void etnaviv_core_dump(struct etnaviv_gem_submit *submit)
 	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");
@@ -230,5 +229,5 @@ void etnaviv_core_dump(struct etnaviv_gem_submit *submit)
 
 	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);
 }
-- 
2.39.2