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authorMikulas Patocka <mpatocka@redhat.com>2022-05-10 13:17:32 -0400
committerChristoph Hellwig <hch@lst.de>2022-05-11 19:48:34 +0200
commit84bc4f1dbbbb5f8aa68706a96711dccb28b518e5 (patch)
treeafd9910f391ccf3a04aa03f6fb87becf76af4388 /kernel/dma
parent92826e967535db2eb117db227b1191aaf98e4bb3 (diff)
dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC
We observed the error "cacheline tracking ENOMEM, dma-debug disabled" during a light system load (copying some files). The reason for this error is that the dma_active_cacheline radix tree uses GFP_NOWAIT allocation - so it can't access the emergency memory reserves and it fails as soon as anybody reaches the watermark. This patch changes GFP_NOWAIT to GFP_ATOMIC, so that it can access the emergency memory reserves. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel/dma')
-rw-r--r--kernel/dma/debug.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index f8ff598596b8..ac740630c79c 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -448,7 +448,7 @@ void debug_dma_dump_mappings(struct device *dev)
* other hand, consumes a single dma_debug_entry, but inserts 'nents'
* entries into the tree.
*/
-static RADIX_TREE(dma_active_cacheline, GFP_NOWAIT);
+static RADIX_TREE(dma_active_cacheline, GFP_ATOMIC);
static DEFINE_SPINLOCK(radix_lock);
#define ACTIVE_CACHELINE_MAX_OVERLAP ((1 << RADIX_TREE_MAX_TAGS) - 1)
#define CACHELINE_PER_PAGE_SHIFT (PAGE_SHIFT - L1_CACHE_SHIFT)