From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Sasha Levin <sashal@kernel.org>,
iommu@lists.linux-foundation.org,
Mikulas Patocka <mpatocka@redhat.com>,
Christoph Hellwig <hch@lst.de>
Subject: [PATCH AUTOSEL 5.18 100/159] dma-debug: change allocation mode from GFP_NOWAIT to GFP_ATIOMIC
Date: Mon, 30 May 2022 09:23:25 -0400 [thread overview]
Message-ID: <20220530132425.1929512-100-sashal@kernel.org> (raw)
In-Reply-To: <20220530132425.1929512-1-sashal@kernel.org>
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>
---
kernel/dma/debug.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
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)
--
2.35.1
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prev parent reply other threads:[~2022-05-30 13:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-05-30 13:21 [PATCH AUTOSEL 5.18 001/159] iommu/vt-d: Add RPLS to quirk list to skip TE disabling Sasha Levin
2022-05-30 13:23 ` Sasha Levin [this message]
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