linux-kernel - [PATCH] mm: kmemleak: alloc gray object for reserved region with direct map.

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Date:   Tue, 23 Nov 2021 17:06:41 +0800
From:   Calvin Zhang <calvinzhang.cool@...il.com>
To:     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, Calvin Zhang <calvinzhang.cool@...il.com>
Subject: [PATCH] mm: kmemleak: alloc gray object for reserved region with direct map.

Reserved regions with direct mapping may contain references to other
regions. CMA region with fixed location is reserved without creating
kmemleak_object for it.

So add them as gray kmemleak objects.

Signed-off-by: Calvin Zhang <calvinzhang.cool@...il.com>
---
 drivers/of/fdt.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index bdca35284ceb..116c582fea7a 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -26,6 +26,7 @@
 #include <linux/serial_core.h>
 #include <linux/sysfs.h>
 #include <linux/random.h>
+#include <linux/kmemleak.h>
 
 #include <asm/setup.h>  /* for COMMAND_LINE_SIZE */
 #include <asm/page.h>
@@ -522,9 +523,12 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
 		size = dt_mem_next_cell(dt_root_size_cells, &prop);
 
 		if (size &&
-		    early_init_dt_reserve_memory_arch(base, size, nomap) == 0)
+		    early_init_dt_reserve_memory_arch(base, size, nomap) == 0) {
 			pr_debug("Reserved memory: reserved region for node '%s': base %pa, size %lu MiB\n",
 				uname, &base, (unsigned long)(size / SZ_1M));
+			if (!nomap)
+				kmemleak_alloc_phys(base, size, 0, 0);
+		}
 		else
 			pr_info("Reserved memory: failed to reserve memory for node '%s': base %pa, size %lu MiB\n",
 				uname, &base, (unsigned long)(size / SZ_1M));
-- 
2.30.2