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Date:   Mon, 20 Mar 2023 00:00:01 +0200
From:   Mike Rapoport <rppt@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     David Hildenbrand <david@...hat.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 08/15] init,mm: move mm_init() to mm/mm_init.c and rename it to mm_core_init()

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

Make mm_init() a part of mm/ codebase. mm_core_init() better describes
what the function does and does not clash with mm_init() in kernel/fork.c

Signed-off-by: Mike Rapoport (IBM) <rppt@...nel.org>
---
 include/linux/mm.h |  1 +
 init/main.c        | 71 ++------------------------------------------
 mm/mm_init.c       | 73 ++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 76 insertions(+), 69 deletions(-)

diff --git a/include/linux/mm.h b/include/linux/mm.h
index ee755bb4e1c1..2d7f095136fc 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -39,6 +39,7 @@ struct pt_regs;
 
 extern int sysctl_page_lock_unfairness;
 
+void mm_core_init(void);
 void init_mm_internals(void);
 
 #ifndef CONFIG_NUMA		/* Don't use mapnrs, do it properly */
diff --git a/init/main.c b/init/main.c
index 4423906177c1..8a20b4c25f24 100644
--- a/init/main.c
+++ b/init/main.c
@@ -803,73 +803,6 @@ static inline void initcall_debug_enable(void)
 }
 #endif
 
-/* Report memory auto-initialization states for this boot. */
-static void __init report_meminit(void)
-{
-	const char *stack;
-
-	if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
-		stack = "all(pattern)";
-	else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
-		stack = "all(zero)";
-	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
-		stack = "byref_all(zero)";
-	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
-		stack = "byref(zero)";
-	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
-		stack = "__user(zero)";
-	else
-		stack = "off";
-
-	pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
-		stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
-		want_init_on_free() ? "on" : "off");
-	if (want_init_on_free())
-		pr_info("mem auto-init: clearing system memory may take some time...\n");
-}
-
-/*
- * Set up kernel memory allocators
- */
-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.
-	 */
-	page_ext_init_flatmem();
-	init_mem_debugging_and_hardening();
-	kfence_alloc_pool();
-	report_meminit();
-	kmsan_init_shadow();
-	stack_depot_early_init();
-	mem_init();
-	mem_init_print_info();
-	kmem_cache_init();
-	/*
-	 * page_owner must be initialized after buddy is ready, and also after
-	 * slab is ready so that stack_depot_init() works properly
-	 */
-	page_ext_init_flatmem_late();
-	kmemleak_init();
-	pgtable_init();
-	debug_objects_mem_init();
-	vmalloc_init();
-	/* If no deferred init page_ext now, as vmap is fully initialized */
-	if (!deferred_struct_pages)
-		page_ext_init();
-	/* Should be run before the first non-init thread is created */
-	init_espfix_bsp();
-	/* Should be run after espfix64 is set up. */
-	pti_init();
-	kmsan_init_runtime();
-	mm_cache_init();
-}
-
 #ifdef CONFIG_RANDOMIZE_KSTACK_OFFSET
 DEFINE_STATIC_KEY_MAYBE_RO(CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT,
 			   randomize_kstack_offset);
@@ -993,13 +926,13 @@ asmlinkage __visible void __init __no_sanitize_address start_kernel(void)
 
 	/*
 	 * These use large bootmem allocations and must precede
-	 * kmem_cache_init()
+	 * initalization of page allocator
 	 */
 	setup_log_buf(0);
 	vfs_caches_init_early();
 	sort_main_extable();
 	trap_init();
-	mm_init();
+	mm_core_init();
 	poking_init();
 	ftrace_init();
 
diff --git a/mm/mm_init.c b/mm/mm_init.c
index 8aaaddd13a20..1da48762e4a2 100644
--- a/mm/mm_init.c
+++ b/mm/mm_init.c
@@ -20,9 +20,15 @@
 #include <linux/nmi.h>
 #include <linux/buffer_head.h>
 #include <linux/kmemleak.h>
+#include <linux/kfence.h>
+#include <linux/page_ext.h>
+#include <linux/pti.h>
+#include <linux/pgtable.h>
 #include "internal.h"
 #include "shuffle.h"
 
+#include <asm/setup.h>
+
 #ifdef CONFIG_DEBUG_MEMORY_INIT
 int __meminitdata mminit_loglevel;
 
@@ -2504,3 +2510,70 @@ void __init memblock_free_pages(struct page *page, unsigned long pfn,
 	}
 	__free_pages_core(page, order);
 }
+
+/* Report memory auto-initialization states for this boot. */
+static void __init report_meminit(void)
+{
+	const char *stack;
+
+	if (IS_ENABLED(CONFIG_INIT_STACK_ALL_PATTERN))
+		stack = "all(pattern)";
+	else if (IS_ENABLED(CONFIG_INIT_STACK_ALL_ZERO))
+		stack = "all(zero)";
+	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL))
+		stack = "byref_all(zero)";
+	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF))
+		stack = "byref(zero)";
+	else if (IS_ENABLED(CONFIG_GCC_PLUGIN_STRUCTLEAK_USER))
+		stack = "__user(zero)";
+	else
+		stack = "off";
+
+	pr_info("mem auto-init: stack:%s, heap alloc:%s, heap free:%s\n",
+		stack, want_init_on_alloc(GFP_KERNEL) ? "on" : "off",
+		want_init_on_free() ? "on" : "off");
+	if (want_init_on_free())
+		pr_info("mem auto-init: clearing system memory may take some time...\n");
+}
+
+/*
+ * Set up kernel memory allocators
+ */
+void __init mm_core_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.
+	 */
+	page_ext_init_flatmem();
+	init_mem_debugging_and_hardening();
+	kfence_alloc_pool();
+	report_meminit();
+	kmsan_init_shadow();
+	stack_depot_early_init();
+	mem_init();
+	mem_init_print_info();
+	kmem_cache_init();
+	/*
+	 * page_owner must be initialized after buddy is ready, and also after
+	 * slab is ready so that stack_depot_init() works properly
+	 */
+	page_ext_init_flatmem_late();
+	kmemleak_init();
+	pgtable_init();
+	debug_objects_mem_init();
+	vmalloc_init();
+	/* If no deferred init page_ext now, as vmap is fully initialized */
+	if (!deferred_struct_pages)
+		page_ext_init();
+	/* Should be run before the first non-init thread is created */
+	init_espfix_bsp();
+	/* Should be run after espfix64 is set up. */
+	pti_init();
+	kmsan_init_runtime();
+	mm_cache_init();
+}
-- 
2.35.1

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