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| author | Mikulas Patocka <mpatocka@redhat.com> | 2022-05-10 13:17:32 -0400 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2022-05-11 19:48:34 +0200 |
| commit | 84bc4f1dbbbb5f8aa68706a96711dccb28b518e5 (patch) | |
| tree | afd9910f391ccf3a04aa03f6fb87becf76af4388 /kernel/dma | |
| parent | 92826e967535db2eb117db227b1191aaf98e4bb3 (diff) | |
| download | linux-84bc4f1dbbbb5f8aa68706a96711dccb28b518e5.tar.bz2 | |
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.c | 2 |
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) |