linux-kernel - [RFC][PATCH v2 23/29] mm/sparse: Register information into Kmemdump

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Message-ID: <20250724135512.518487-24-eugen.hristev@linaro.org>
Date: Thu, 24 Jul 2025 16:55:06 +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 23/29] mm/sparse: Register information into Kmemdump

Annotate vital static information into kmemdump:
 - mem_section

Information on these variables is stored into dedicated kmemdump section.

Register dynamic information into kmemdump:
 - section
 - mem_section_usage

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

Signed-off-by: Eugen Hristev <eugen.hristev@...aro.org>
---
 mm/sparse.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/mm/sparse.c b/mm/sparse.c
index 3c012cf83cc2..04b1b679a2ad 100644
--- a/mm/sparse.c
+++ b/mm/sparse.c
@@ -15,6 +15,7 @@
 #include <linux/swapops.h>
 #include <linux/bootmem_info.h>
 #include <linux/vmstat.h>
+#include <linux/kmemdump.h>
 #include "internal.h"
 #include <asm/dma.h>
 
@@ -30,6 +31,7 @@ struct mem_section mem_section[NR_SECTION_ROOTS][SECTIONS_PER_ROOT]
 	____cacheline_internodealigned_in_smp;
 #endif
 EXPORT_SYMBOL(mem_section);
+KMEMDUMP_VAR_CORE(mem_section, sizeof(mem_section));
 
 #ifdef NODE_NOT_IN_PAGE_FLAGS
 /*
@@ -67,10 +69,11 @@ static noinline struct mem_section __ref *sparse_index_alloc(int nid)
 				   sizeof(struct mem_section);
 
 	if (slab_is_available()) {
-		section = kzalloc_node(array_size, GFP_KERNEL, nid);
+		section = kmemdump_alloc_size(array_size, kzalloc_node,
+					      array_size, GFP_KERNEL, nid);
 	} else {
-		section = memblock_alloc_node(array_size, SMP_CACHE_BYTES,
-					      nid);
+		section = kmemdump_alloc_size(array_size, memblock_alloc_node,
+					      array_size, SMP_CACHE_BYTES, nid);
 		if (!section)
 			panic("%s: Failed to allocate %lu bytes nid=%d\n",
 			      __func__, array_size, nid);
@@ -252,7 +255,9 @@ static void __init memblocks_present(void)
 
 		size = sizeof(struct mem_section *) * NR_SECTION_ROOTS;
 		align = 1 << (INTERNODE_CACHE_SHIFT);
-		mem_section = memblock_alloc_or_panic(size, align);
+		mem_section = kmemdump_alloc_id_size(KMEMDUMP_ID_COREIMAGE_MEMSECT,
+						     size, memblock_alloc_or_panic,
+						     size, align);
 	}
 #endif
 
@@ -338,7 +343,8 @@ sparse_early_usemaps_alloc_pgdat_section(struct pglist_data *pgdat,
 	limit = goal + (1UL << PA_SECTION_SHIFT);
 	nid = early_pfn_to_nid(goal >> PAGE_SHIFT);
 again:
-	usage = memblock_alloc_try_nid(size, SMP_CACHE_BYTES, goal, limit, nid);
+	usage = kmemdump_alloc_size(size, memblock_alloc_try_nid, size,
+				    SMP_CACHE_BYTES, goal, limit, nid);
 	if (!usage && limit) {
 		limit = MEMBLOCK_ALLOC_ACCESSIBLE;
 		goto again;
-- 
2.43.0