linux-kernel - [PATCH] mm: kmemleak: Ignore kmemleak scanning on CMA regions

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Date:   Fri, 26 Nov 2021 10:47:11 +0800
From:   Calvin Zhang <calvinzhang.cool@...il.com>
To:     Christoph Hellwig <hch@....de>,
        Marek Szyprowski <m.szyprowski@...sung.com>,
        Robin Murphy <robin.murphy@....com>,
        Rob Herring <robh+dt@...nel.org>,
        Frank Rowand <frowand.list@...il.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, iommu@...ts.linux-foundation.org,
        Calvin Zhang <calvinzhang.cool@...il.com>
Subject: [PATCH] mm: kmemleak: Ignore kmemleak scanning on CMA regions

Just like this:
commit 620951e27457 ("mm/cma: make kmemleak ignore CMA regions").

Add kmemleak_ignore_phys() for CMA created from of reserved node.

Signed-off-by: Calvin Zhang <calvinzhang.cool@...il.com>
---
 kernel/dma/contiguous.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c
index 3d63d91cba5c..66bd9a59615e 100644
--- a/kernel/dma/contiguous.c
+++ b/kernel/dma/contiguous.c
@@ -50,6 +50,7 @@
 #include <linux/sizes.h>
 #include <linux/dma-map-ops.h>
 #include <linux/cma.h>
+#include <linux/kmemleak.h>
 
 #ifdef CONFIG_CMA_SIZE_MBYTES
 #define CMA_SIZE_MBYTES CONFIG_CMA_SIZE_MBYTES
@@ -426,6 +427,9 @@ static int __init rmem_cma_setup(struct reserved_mem *rmem)
 		pr_err("Reserved memory: unable to setup CMA region\n");
 		return err;
 	}
+
+	kmemleak_ignore_phys(rmem->base);
+
 	/* Architecture specific contiguous memory fixup. */
 	dma_contiguous_early_fixup(rmem->base, rmem->size);
 
-- 
2.30.2