linux-kernel - [PATCH 2/2] base/node: Use curr_node_memblock_intersect_memory_block to Get Memory Block NID if CONFIG_DEFERRED_STRUCT_PAGE

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Message-ID: <d10d1a9f11e9f8752c7ec5ff5bb262b3f6c6bb85.1744175097.git.donettom@linux.ibm.com>
Date: Wed,  9 Apr 2025 10:57:57 +0530
From: Donet Tom <donettom@...ux.ibm.com>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-kernel@...r.kernel.org, David Hildenbrand <david@...hat.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        Mike Rapoport <rppt@...nel.org>
Cc: Ritesh Harjani <ritesh.list@...il.com>, rafael@...nel.org,
        Danilo Krummrich <dakr@...nel.org>, Donet Tom <donettom@...ux.ibm.com>
Subject: [PATCH 2/2] base/node: Use curr_node_memblock_intersect_memory_block to Get Memory Block NID if CONFIG_DEFERRED_STRUCT_PAGE_INIT is Set

In the current implementation, when CONFIG_DEFERRED_STRUCT_PAGE_INIT is
set, we iterate over all PFNs in the memory block and use
early_pfn_to_nid to find the NID until a match is found.

This patch we are using curr_node_memblock_intersect_memory_block() to
check if the current node's memblock intersects with the memory block
passed when CONFIG_DEFERRED_STRUCT_PAGE_INIT is set. If an intersection
is found, the memory block is added to the current node.

If CONFIG_DEFERRED_STRUCT_PAGE_INIT is not set, the existing mechanism
for finding the NID will continue to be used.

Signed-off-by: Donet Tom <donettom@...ux.ibm.com>
---
 drivers/base/node.c | 37 +++++++++++++++++++++++++++++--------
 1 file changed, 29 insertions(+), 8 deletions(-)

diff --git a/drivers/base/node.c b/drivers/base/node.c
index cd13ef287011..5c5dd02b8bdd 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -20,6 +20,8 @@
 #include <linux/pm_runtime.h>
 #include <linux/swap.h>
 #include <linux/slab.h>
+#include <linux/memblock.h>
+
 
 static const struct bus_type node_subsys = {
 	.name = "node",
@@ -782,16 +784,19 @@ static void do_register_memory_block_under_node(int nid,
 				    ret);
 }
 
-/* register memory section under specified node if it spans that node */
-static int register_mem_block_under_node_early(struct memory_block *mem_blk,
-					       void *arg)
+static int register_mem_block_early_if_dfer_page_init(struct memory_block *mem_blk,
+				unsigned long start_pfn, unsigned long end_pfn, int nid)
 {
-	unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
-	unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
-	unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
-	int nid = *(int *)arg;
-	unsigned long pfn;
 
+	if (curr_node_memblock_intersect_memory_block(start_pfn, end_pfn, nid))
+		do_register_memory_block_under_node(nid, mem_blk, MEMINIT_EARLY);
+	return 0;
+}
+
+static int register_mem_block_early__normal(struct memory_block *mem_blk,
+				unsigned long start_pfn, unsigned long end_pfn, int nid)
+{
+	unsigned long pfn;
 	for (pfn = start_pfn; pfn <= end_pfn; pfn++) {
 		int page_nid;
 
@@ -821,6 +826,22 @@ static int register_mem_block_under_node_early(struct memory_block *mem_blk,
 	/* mem section does not span the specified node */
 	return 0;
 }
+/* register memory section under specified node if it spans that node */
+static int register_mem_block_under_node_early(struct memory_block *mem_blk,
+					       void *arg)
+{
+	unsigned long memory_block_pfns = memory_block_size_bytes() / PAGE_SIZE;
+	unsigned long start_pfn = section_nr_to_pfn(mem_blk->start_section_nr);
+	unsigned long end_pfn = start_pfn + memory_block_pfns - 1;
+	int nid = *(int *)arg;
+
+#ifdef CONFIG_DEFERRED_STRUCT_PAGE_INIT
+	if (system_state < SYSTEM_RUNNING)
+		return register_mem_block_early_if_dfer_page_init(mem_blk, start_pfn, end_pfn, nid);
+#endif
+	return register_mem_block_early__normal(mem_blk, start_pfn, end_pfn, nid);
+
+}
 
 /*
  * During hotplug we know that all pages in the memory block belong to the same
-- 
2.48.1