linux-kernel - [PATCH 5/6] mm: make free_area_init

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Date:   Thu, 27 Jan 2022 09:53:04 +0100
From:   Michal Hocko <mhocko@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     <linux-mm@...ck.org>, LKML <linux-kernel@...r.kernel.org>,
        David Hildenbrand <david@...hat.com>,
        Alexey Makhalov <amakhalov@...are.com>,
        Dennis Zhou <dennis@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        Oscar Salvador <osalvador@...e.de>, Tejun Heo <tj@...nel.org>,
        Christoph Lameter <cl@...ux.com>,
        Nico Pache <npache@...hat.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Rafael Aquini <raquini@...hat.com>,
        Michal Hocko <mhocko@...e.com>
Subject: [PATCH 5/6] mm: make free_area_init_node aware of memory less nodes

From: Michal Hocko <mhocko@...e.com>

free_area_init_node is also called from memory less node initialization
path (free_area_init_memoryless_node). It doesn't really make much sense
to display the physical memory range for those nodes:
Initmem setup node XX [mem 0x0000000000000000-0x0000000000000000]

Instead be explicit that the node is memoryless:
Initmem setup node XX as memoryless

Acked-by: Rafael Aquini <raquini@...hat.com>
Signed-off-by: Michal Hocko <mhocko@...e.com>
---
 mm/page_alloc.c | 11 ++++++++---
 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 32d0189de4c5..83da2279be72 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7682,9 +7682,14 @@ static void __init free_area_init_node(int nid)
 	pgdat->node_start_pfn = start_pfn;
 	pgdat->per_cpu_nodestats = NULL;
 
-	pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
-		(u64)start_pfn << PAGE_SHIFT,
-		end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
+	if (start_pfn != end_pfn) {
+		pr_info("Initmem setup node %d [mem %#018Lx-%#018Lx]\n", nid,
+			(u64)start_pfn << PAGE_SHIFT,
+			end_pfn ? ((u64)end_pfn << PAGE_SHIFT) - 1 : 0);
+	} else {
+		pr_info("Initmem setup node %d as memoryless\n", nid);
+	}
+
 	calculate_node_totalpages(pgdat, start_pfn, end_pfn);
 
 	alloc_node_mem_map(pgdat);
-- 
2.30.2