From: Mikulas Patocka mpatocka@redhat.com
[ Upstream commit 84bc4f1dbbbb5f8aa68706a96711dccb28b518e5 ]
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 Signed-off-by: Sasha Levin sashal@kernel.org --- lib/dma-debug.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/dma-debug.c b/lib/dma-debug.c index 61e7240947f5..163e0e9b357f 100644 --- a/lib/dma-debug.c +++ b/lib/dma-debug.c @@ -465,7 +465,7 @@ EXPORT_SYMBOL(debug_dma_dump_mappings); * At any time debug_dma_assert_idle() can be called to trigger a * warning if any cachelines in the given page are in the active set. */ -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)