arch, mm: make releasing of memory to page allocator more explicit

The point where the memory is released from memblock to the buddy
allocator is hidden inside arch-specific mem_init()s and the call to
memblock_free_all() is needlessly duplicated in every artiste cure and
after introduction of arch_mm_preinit() hook, mem_init() implementation on
many architecture only contains the call to memblock_free_all().

Pull memblock_free_all() call into mm_core_init() and drop mem_init() on
relevant architectures to make it more explicit where the free memory is
released from memblock to the buddy allocator and to reduce code
duplication in architecture specific code.

Link: https://lkml.kernel.org/r/[e-mail]
Signed-off-by: Mike Rapoport (Microsoft) <[e-mail]>
Acked-by: Dave Hansen <[e-mail]> [x86]
Acked-by: Geert Uytterhoeven <[e-mail]> [m68k]
Tested-by: Mark Brown <[e-mail]>
Cc: Alexander Gordeev <[e-mail]>
Cc: Andreas Larsson <[e-mail]>
Cc: Andy Lutomirski <[e-mail]>
Cc: Ard Biesheuvel <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Borislav Betkov <[e-mail]>
Cc: Catalin Marinas <[e-mail]>
Cc: David S. Miller <[e-mail]>
Cc: Dinh Nguyen <[e-mail]>
Cc: Gerald Schaefer <[e-mail]>
Cc: Guo Ren (csky) <[e-mail]>
Cc: Heiko Carstens <[e-mail]>
Cc: Helge Deller <[e-mail]>
Cc: Huacai Chen <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: Jiaxun Yang <[e-mail]>
Cc: Johannes Berg <[e-mail]>
Cc: John Paul Adrian Glaubitz <[e-mail]>
Cc: Madhavan Srinivasan <[e-mail]>
Cc: Matt Turner <[e-mail]>
Cc: Max Filippov <[e-mail]>
Cc: Michael Ellerman <[e-mail]>
Cc: Michal Simek <[e-mail]>
Cc: Palmer Dabbelt <[e-mail]>
Cc: Richard Weinberger <[e-mail]>
Cc: Russel King <[e-mail]>
Cc: Stafford Horne <[e-mail]>
Cc: Thomas Bogendoerfer <[e-mail]>
Cc: Thomas Gleinxer <[e-mail]>
Cc: Vasily Gorbik <[e-mail]>
Cc: Vineet Gupta <[e-mail]>
Cc: Will Deacon <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>

arch/alpha/mm/init.c

···
 }
 #endif
 
-void __init
-mem_init(void)
-{
-	memblock_free_all();
-}
-
 static const pgprot_t protection_map[16] = {
 	[VM_NONE]					= _PAGE_P(_PAGE_FOE | _PAGE_FOW |
 								  _PAGE_FOR),

arch/arc/mm/init.c

···
 	BUILD_BUG_ON((PTRS_PER_PTE * sizeof(pte_t)) > PAGE_SIZE);
 }
 
-/*
- * mem_init - initializes memory
- *
- * Frees up bootmem
- * Calculates and displays memory available/used
- */
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 #ifdef CONFIG_HIGHMEM
 int pfn_valid(unsigned long pfn)
 {

arch/arm/mm/init.c

···
 #endif
 }
 
-/*
- * mem_init() marks the free areas in the mem_map and tells us how much
- * memory is free.  This is done after various parts of the system have
- * claimed their memory after the kernel image.
- */
-void __init mem_init(void)
-{
-	/* this will put all unused low memory onto the freelists */
-	memblock_free_all();
-}
-
 #ifdef CONFIG_STRICT_KERNEL_RWX
 struct section_perm {
 	const char *name;

arch/arm64/mm/init.c

···
 	}
 }
 
-/*
- * mem_init() marks the free areas in the mem_map and tells us how much memory
- * is free.  This is done after various parts of the system have claimed their
- * memory after the kernel image.
- */
-void __init mem_init(void)
-{
-	/* this will put all unused low memory onto the freelists */
-	memblock_free_all();
-}
-
 void free_initmem(void)
 {
 	void *lm_init_begin = lm_alias(__init_begin);

arch/csky/mm/init.c

···
 						__page_aligned_bss;
 EXPORT_SYMBOL(empty_zero_page);
 
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 void free_initmem(void)
 {
 	free_initmem_default(-1);

arch/hexagon/mm/init.c

···
 /*  checkpatch says don't init this to 0.  */
 unsigned long long kmap_generation;
 
-/*
- * mem_init - initializes memory
- *
- * Frees up bootmem
- * Fixes up more stuff for HIGHMEM
- * Calculates and displays memory available/used
- */
-void __init mem_init(void)
-{
-	/*  No idea where this is actually declared.  Seems to evade LXR.  */
-	memblock_free_all();
-
-	/*
-	 *  To-Do:  someone somewhere should wipe out the bootmem map
-	 *  after we're done?
-	 */
-}
-
 void sync_icache_dcache(pte_t pte)
 {
 	unsigned long addr;

arch/loongarch/kernel/numa.c

···
 	free_area_init(zones_size);
 }
 
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 int pcibus_to_node(struct pci_bus *bus)
 {
 	return dev_to_node(&bus->dev);

arch/loongarch/mm/init.c

···
 
 	free_area_init(max_zone_pfns);
 }
-
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
 #endif /* !CONFIG_NUMA */
 
 void __ref free_initmem(void)

arch/m68k/mm/init.c

···
 
 void __init mem_init(void)
 {
-	/* this will put all memory onto the freelists */
-	memblock_free_all();
 	init_pointer_tables();
 }

arch/microblaze/mm/init.c

···
 
 void __init mem_init(void)
 {
-	/* this will put all memory onto the freelists */
-	memblock_free_all();
-
 	mem_init_done = 1;
 }
 

arch/mips/mm/init.c

···
 }
 #endif /* !CONFIG_NUMA */
 
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 void free_init_pages(const char *what, unsigned long begin, unsigned long end)
 {
 	unsigned long pfn;

arch/nios2/mm/init.c

···
 			(unsigned long)empty_zero_page + PAGE_SIZE);
 }
 
-void __init mem_init(void)
-{
-	/* this will put all memory onto the freelists */
-	memblock_free_all();
-}
-
 void __init mmu_init(void)
 {
 	flush_tlb_all();

arch/openrisc/mm/init.c

···
 	/* clear the zero-page */
 	memset((void *)empty_zero_page, 0, PAGE_SIZE);
 
-	/* this will put all low memory onto the freelists */
-	memblock_free_all();
-
 	printk("mem_init_done ...........................................\n");
 	mem_init_done = 1;
 	return;

arch/parisc/mm/init.c

···
 	BUILD_BUG_ON(TMPALIAS_MAP_START >= 0x80000000);
 #endif
 
-	memblock_free_all();
-
 #ifdef CONFIG_PA11
 	if (boot_cpu_data.cpu_type == pcxl2 || boot_cpu_data.cpu_type == pcxl) {
 		pcxl_dma_start = (unsigned long)SET_MAP_OFFSET(MAP_START);

arch/powerpc/mm/mem.c

···
 #endif /* CONFIG_PPC32 */
 }
 
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 void free_initmem(void)
 {
 	ppc_md.progress = ppc_printk_progress;

arch/riscv/mm/init.c

···
 	print_vm_layout();
 }
 
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 /* Limit the memory size via mem. */
 static phys_addr_t memory_limit;
 #ifdef CONFIG_XIP_KERNEL

arch/s390/mm/init.c

···
 	setup_zero_pages();	/* Setup zeroed pages. */
 }
 
-void __init mem_init(void)
-{
-	/* this will put all low memory onto the freelists */
-	memblock_free_all();
-}
-
 unsigned long memory_block_size_bytes(void)
 {
 	/*

arch/sh/mm/init.c

···
 
 void __init mem_init(void)
 {
-	memblock_free_all();
-
 	/* Set this up early, so we can take care of the zero page */
 	cpu_cache_init();
 

arch/sparc/mm/init_32.c

···
 	taint_real_pages();
 }
 
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 void sparc_flush_page_to_ram(struct page *page)
 {
 	unsigned long vaddr = (unsigned long)page_address(page);

arch/sparc/mm/init_64.c

···
 }
 void __init mem_init(void)
 {
-	memblock_free_all();
-
 	/*
 	 * Must be done after boot memory is put on freelist, because here we
 	 * might set fields in deferred struct pages that have not yet been

arch/um/kernel/mem.c

···
 
 void __init mem_init(void)
 {
-	/* this will put all low memory onto the freelists */
-	memblock_free_all();
 	kmalloc_ok = 1;
 }
 

arch/x86/mm/init_32.c

···
 
 void __init mem_init(void)
 {
-	/* this will put all low memory onto the freelists */
-	memblock_free_all();
-
 	after_bootmem = 1;
 	x86_init.hyper.init_after_bootmem();
 

arch/x86/mm/init_64.c

···
 {
 	/* clear_bss() already clear the empty_zero_page */
 
-	/* this will put all memory onto the freelists */
-	memblock_free_all();
 	after_bootmem = 1;
 	x86_init.hyper.init_after_bootmem();
 

arch/xtensa/mm/init.c

···
 	print_vm_layout();
 }
 
-/*
- * Initialize memory pages.
- */
-
-void __init mem_init(void)
-{
-	memblock_free_all();
-}
-
 static void __init parse_memmap_one(char *p)
 {
 	char *oldp;

include/linux/memblock.h

···
 int memblock_clear_nomap(phys_addr_t base, phys_addr_t size);
 int memblock_reserved_mark_noinit(phys_addr_t base, phys_addr_t size);
 
-void memblock_free_all(void);
 void memblock_free(void *ptr, size_t size);
 void reset_all_zones_managed_pages(void);
 

mm/internal.h

···
 }
 
 extern bool mirrored_kernelcore;
-extern bool memblock_has_mirror(void);
+bool memblock_has_mirror(void);
+void memblock_free_all(void);
 
 static __always_inline void vma_set_range(struct vm_area_struct *vma,
 					  unsigned long start, unsigned long end,

mm/mm_init.c

···
 {
 }
 
+void __init __weak mem_init(void)
+{
+}
+
 /*
  * Set up kernel memory allocators
  */
···
 	report_meminit();
 	kmsan_init_shadow();
 	stack_depot_early_init();
+	memblock_free_all();
 	mem_init();
 	kmem_cache_init();
 	/*