linux-kernel - [PATCH] dma/pool: respect __GFP_NOWARN in dma_alloc_from

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Message-ID: <20260111014150.2411570-1-s-adivi@ti.com>
Date: Sun, 11 Jan 2026 07:11:50 +0530
From: Sai Sree Kartheek Adivi <s-adivi@...com>
To: <m.szyprowski@...sung.com>, <robin.murphy@....com>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>
CC: <vigneshr@...com>
Subject: [PATCH] dma/pool: respect __GFP_NOWARN in dma_alloc_from_pool()

Currently, dma_alloc_from_pool() unconditionally warns and dumps a stack
trace when an allocation fails.

This prevents callers from using the __GFP_NOWARN flag to suppress error
messages, breaking the expectation that this flag will silence
allocation failure logs.

Align dma_pool behaviour with other core allocators by checking for
__GFP_NOWARN before issuing the warning.

Fixes: 9420139f516d ("dma-pool: fix coherent pool allocations for IOMMU mappings")
Signed-off-by: Sai Sree Kartheek Adivi <s-adivi@...com>
---
 kernel/dma/pool.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index 26392badc36b..40dc2ab9915f 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -276,7 +276,8 @@ struct page *dma_alloc_from_pool(struct device *dev, size_t size,
 			return page;
 	}
 
-	WARN(1, "Failed to get suitable pool for %s\n", dev_name(dev));
+	if (!(gfp & __GFP_NOWARN))
+		WARN(1, "Failed to get suitable pool for %s\n", dev_name(dev));
 	return NULL;
 }
 
-- 
2.34.1