linux-kernel - [PATCH v2] dma-pool: don't allocate DMA32 pool if no 32-bit memory

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20260112065857.3137331-1-vladimir.kondratiev@mobileye.com>
Date: Mon, 12 Jan 2026 08:58:56 +0200
From: Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>
To: lkp@...el.com,
	mick@....forth.gr,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Robin Murphy <robin.murphy@....com>
Cc: iommu@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	llvm@...ts.linux.dev,
	oe-kbuild-all@...ts.linux.dev,
	vladimir.kondratiev@...ileye.com,
	Vladimir.Kondratiev@...ileye.com,
	akpm@...ux-foundation.org,
	alex@...ti.fr,
	aou@...s.berkeley.edu,
	hch@...radead.org,
	linux-mm@...ck.org,
	linux-riscv@...ts.infradead.org,
	palmer@...belt.com,
	paul.walmsley@...ive.com
Subject: [PATCH v2] dma-pool: don't allocate DMA32 pool if no 32-bit memory

If system have no 32-bit memory, GFP_DMA32 pool allocation will
obviously fail, so skip it.

Changes in v2: use arch-independent "memblock_start_of_DRAM" to get
DRAM base address

Signed-off-by: Vladimir Kondratiev <vladimir.kondratiev@...ileye.com>
---
 kernel/dma/pool.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c
index ee45dee33d49..ecd77a0272f2 100644
--- a/kernel/dma/pool.c
+++ b/kernel/dma/pool.c
@@ -209,7 +209,7 @@ static int __init dma_atomic_pool_init(void)
 		if (!atomic_pool_dma)
 			ret = -ENOMEM;
 	}
-	if (IS_ENABLED(CONFIG_ZONE_DMA32)) {
+	if (IS_ENABLED(CONFIG_ZONE_DMA32) && memblock_start_of_DRAM() < BIT_ULL(32)) {
 		atomic_pool_dma32 = __dma_atomic_pool_init(atomic_pool_size,
 						GFP_KERNEL | GFP_DMA32);
 		if (!atomic_pool_dma32)

base-commit: 7d0a66e4bb9081d75c82ec4957c50034cb0ea449
-- 
2.43.0