linux-kernel - [PATCH v2 06/14] init: fold build_all_zonelists() and page_alloc_init_cpuhp() to mm

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Date:   Tue, 21 Mar 2023 19:05:05 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.com>,
        Doug Berger <opendmb@...il.com>,
        Matthew Wilcox <willy@...radead.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Mike Rapoport <rppt@...nel.org>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Vlastimil Babka <vbabka@...e.cz>, linux-kernel@...r.kernel.org,
        linux-mips@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2 06/14] init: fold build_all_zonelists() and page_alloc_init_cpuhp() to mm_init()

From: "Mike Rapoport (IBM)" <rppt@...nel.org>

Both build_all_zonelists() and page_alloc_init_cpuhp() must be called
after SMP setup is complete but before the page allocator is set up.

Still, they both are a part of memory management initialization, so move
them to mm_init().

Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
Acked-by: David Hildenbrand <david@...hat.com>
---
 init/main.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/init/main.c b/init/main.c
index b2499bee7a3c..4423906177c1 100644
--- a/init/main.c
+++ b/init/main.c
@@ -833,6 +833,10 @@ static void __init report_meminit(void)
  */
 static void __init mm_init(void)
 {
+	/* Initializations relying on SMP setup */
+	build_all_zonelists(NULL);
+	page_alloc_init_cpuhp();
+
 	/*
 	 * page_ext requires contiguous pages,
 	 * bigger than MAX_ORDER unless SPARSEMEM.
@@ -968,9 +972,6 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
 	smp_prepare_boot_cpu();	/* arch-specific boot-cpu hooks */
 	boot_cpu_hotplug_init();
 
-	build_all_zonelists(NULL);
-	page_alloc_init_cpuhp();
-
 	pr_notice("Kernel command line: %s\n", saved_command_line);
 	/* parameters may set static keys */
 	jump_label_init();
-- 
2.35.1