linux-hardening - [RFC][PATCH v2 22/29] mm/numa: Register information into Kmemdump

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Message-ID: <20250724135512.518487-23-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:05 +0300
From: Eugen Hristev <eugen.hristev@...aro.org>
To: linux-kernel@...r.kernel.org,
	linux-arm-msm@...r.kernel.org,
	linux-arch@...r.kernel.org,
	linux-mm@...ck.org,
	tglx@...utronix.de,
	andersson@...nel.org,
	pmladek@...e.com
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-hardening@...r.kernel.org,
	eugen.hristev@...aro.org,
	corbet@....net,
	mojha@....qualcomm.com,
	rostedt@...dmis.org,
	jonechou@...gle.com,
	tudor.ambarus@...aro.org
Subject: [RFC][PATCH v2 22/29] mm/numa: Register information into Kmemdump

Annotate vital static information into kmemdump:
 - node_data

Information on these variables is stored into dedicated kmemdump section.

Register dynamic information into kmemdump:
 - dynamic node data for each node

This information is being allocated for each node, as physical address,
so call kmemdump_phys_alloc_size that will allocate an unique kmemdump
uid, and register the virtual address.

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 mm/numa.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/mm/numa.c b/mm/numa.c
index 7d5e06fe5bd4..88cada571171 100644
--- a/mm/numa.c
+++ b/mm/numa.c
@@ -4,9 +4,11 @@
 #include <linux/printk.h>
 #include <linux/numa.h>
 #include <linux/numa_memblks.h>
+#include <linux/kmemdump.h>
 
 struct pglist_data *node_data[MAX_NUMNODES];
 EXPORT_SYMBOL(node_data);
+KMEMDUMP_VAR_CORE(node_data, MAX_NUMNODES * sizeof(struct pglist_data));
 
 /* Allocate NODE_DATA for a node on the local memory */
 void __init alloc_node_data(int nid)
@@ -16,7 +18,8 @@ void __init alloc_node_data(int nid)
 	int tnid;
 
 	/* Allocate node data.  Try node-local memory and then any node. */
-	nd_pa = memblock_phys_alloc_try_nid(nd_size, SMP_CACHE_BYTES, nid);
+	nd_pa = kmemdump_phys_alloc_size(nd_size, memblock_phys_alloc_try_nid,
+					 nd_size, SMP_CACHE_BYTES, nid);
 	if (!nd_pa)
 		panic("Cannot allocate %zu bytes for node %d data\n",
 		      nd_size, nid);
-- 
2.43.0