mm: remove nobootmem

Move a few remaining functions from nobootmem.c to memblock.c and remove
nobootmem

Link: http://lkml.kernel.org/r/1536927045-23536-28-git-send-email-rppt@linux.vnet.ibm.com
Signed-off-by: Mike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: Michal Hocko <mhocko@suse.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "James E.J. Bottomley" <jejb@parisc-linux.org>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Ley Foon Tan <lftan@altera.com>
Cc: Mark Salter <msalter@redhat.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Palmer Dabbelt <palmer@sifive.com>
Cc: Paul Burton <paul.burton@mips.com>
Cc: Richard Kuo <rkuo@codeaurora.org>
Cc: Richard Weinberger <richard@nod.at>
Cc: Rich Felker <dalias@libc.org>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Serge Semin <fancer.lancer@gmail.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Vineet Gupta <vgupta@synopsys.com>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

3 files changed, 104 insertions, 129 deletions

diff --git a/mm/Makefile b/mm/Makefile
index ca3c844d7a56..d210cc9d6f80 100644
--- a/mm/Makefile
+++ b/mm/Makefile
@@ -42,7 +42,6 @@ obj-y			:= filemap.o mempool.o oom_kill.o fadvise.o \
                            debug.o $(mmu-y)
 
 obj-y += init-mm.o
-obj-y += nobootmem.o
 obj-y += memblock.o
 
 ifdef CONFIG_MMU
diff --git a/mm/memblock.c b/mm/memblock.c
index 8b63a04e8cca..3dd9cfef996c 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -82,6 +82,16 @@
  * initialization compltes.
  */
 
+#ifndef CONFIG_NEED_MULTIPLE_NODES
+struct pglist_data __refdata contig_page_data;
+EXPORT_SYMBOL(contig_page_data);
+#endif
+
+unsigned long max_low_pfn;
+unsigned long min_low_pfn;
+unsigned long max_pfn;
+unsigned long long max_possible_pfn;
+
 static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
 static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock;
 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
@@ -1877,6 +1887,100 @@ static int __init early_memblock(char *p)
 }
 early_param("memblock", early_memblock);
 
+static void __init __free_pages_memory(unsigned long start, unsigned long end)
+{
+        int order;
+
+        while (start < end) {
+                order = min(MAX_ORDER - 1UL, __ffs(start));
+
+                while (start + (1UL << order) > end)
+                        order--;
+
+                memblock_free_pages(pfn_to_page(start), start, order);
+
+                start += (1UL << order);
+        }
+}
+
+static unsigned long __init __free_memory_core(phys_addr_t start,
+                                 phys_addr_t end)
+{
+        unsigned long start_pfn = PFN_UP(start);
+        unsigned long end_pfn = min_t(unsigned long,
+                                      PFN_DOWN(end), max_low_pfn);
+
+        if (start_pfn >= end_pfn)
+                return 0;
+
+        __free_pages_memory(start_pfn, end_pfn);
+
+        return end_pfn - start_pfn;
+}
+
+static unsigned long __init free_low_memory_core_early(void)
+{
+        unsigned long count = 0;
+        phys_addr_t start, end;
+        u64 i;
+
+        memblock_clear_hotplug(0, -1);
+
+        for_each_reserved_mem_region(i, &start, &end)
+                reserve_bootmem_region(start, end);
+
+        /*
+         * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
+         *  because in some case like Node0 doesn't have RAM installed
+         *  low ram will be on Node1
+         */
+        for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
+                                NULL)
+                count += __free_memory_core(start, end);
+
+        return count;
+}
+
+static int reset_managed_pages_done __initdata;
+
+void reset_node_managed_pages(pg_data_t *pgdat)
+{
+        struct zone *z;
+
+        for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
+                z->managed_pages = 0;
+}
+
+void __init reset_all_zones_managed_pages(void)
+{
+        struct pglist_data *pgdat;
+
+        if (reset_managed_pages_done)
+                return;
+
+        for_each_online_pgdat(pgdat)
+                reset_node_managed_pages(pgdat);
+
+        reset_managed_pages_done = 1;
+}
+
+/**
+ * memblock_free_all - release free pages to the buddy allocator
+ *
+ * Return: the number of pages actually released.
+ */
+unsigned long __init memblock_free_all(void)
+{
+        unsigned long pages;
+
+        reset_all_zones_managed_pages();
+
+        pages = free_low_memory_core_early();
+        totalram_pages += pages;
+
+        return pages;
+}
+
 #if defined(CONFIG_DEBUG_FS) && !defined(CONFIG_ARCH_DISCARD_MEMBLOCK)
 
 static int memblock_debug_show(struct seq_file *m, void *private)
diff --git a/mm/nobootmem.c b/mm/nobootmem.c
deleted file mode 100644
index 9608bc581cd6..000000000000
--- a/mm/nobootmem.c
+++ /dev/null
@@ -1,128 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- *  bootmem - A boot-time physical memory allocator and configurator
- *
- *  Copyright (C) 1999 Ingo Molnar
- *                1999 Kanoj Sarcar, SGI
- *                2008 Johannes Weiner
- *
- * Access to this subsystem has to be serialized externally (which is true
- * for the boot process anyway).
- */
-#include <linux/init.h>
-#include <linux/pfn.h>
-#include <linux/slab.h>
-#include <linux/export.h>
-#include <linux/kmemleak.h>
-#include <linux/range.h>
-#include <linux/memblock.h>
-#include <linux/bootmem.h>
-
-#include <asm/bug.h>
-#include <asm/io.h>
-
-#include "internal.h"
-
-#ifndef CONFIG_NEED_MULTIPLE_NODES
-struct pglist_data __refdata contig_page_data;
-EXPORT_SYMBOL(contig_page_data);
-#endif
-
-unsigned long max_low_pfn;
-unsigned long min_low_pfn;
-unsigned long max_pfn;
-unsigned long long max_possible_pfn;
-
-static void __init __free_pages_memory(unsigned long start, unsigned long end)
-{
-        int order;
-
-        while (start < end) {
-                order = min(MAX_ORDER - 1UL, __ffs(start));
-
-                while (start + (1UL << order) > end)
-                        order--;
-
-                memblock_free_pages(pfn_to_page(start), start, order);
-
-                start += (1UL << order);
-        }
-}
-
-static unsigned long __init __free_memory_core(phys_addr_t start,
-                                 phys_addr_t end)
-{
-        unsigned long start_pfn = PFN_UP(start);
-        unsigned long end_pfn = min_t(unsigned long,
-                                      PFN_DOWN(end), max_low_pfn);
-
-        if (start_pfn >= end_pfn)
-                return 0;
-
-        __free_pages_memory(start_pfn, end_pfn);
-
-        return end_pfn - start_pfn;
-}
-
-static unsigned long __init free_low_memory_core_early(void)
-{
-        unsigned long count = 0;
-        phys_addr_t start, end;
-        u64 i;
-
-        memblock_clear_hotplug(0, -1);
-
-        for_each_reserved_mem_region(i, &start, &end)
-                reserve_bootmem_region(start, end);
-
-        /*
-         * We need to use NUMA_NO_NODE instead of NODE_DATA(0)->node_id
-         *  because in some case like Node0 doesn't have RAM installed
-         *  low ram will be on Node1
-         */
-        for_each_free_mem_range(i, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
-                                NULL)
-                count += __free_memory_core(start, end);
-
-        return count;
-}
-
-static int reset_managed_pages_done __initdata;
-
-void reset_node_managed_pages(pg_data_t *pgdat)
-{
-        struct zone *z;
-
-        for (z = pgdat->node_zones; z < pgdat->node_zones + MAX_NR_ZONES; z++)
-                z->managed_pages = 0;
-}
-
-void __init reset_all_zones_managed_pages(void)
-{
-        struct pglist_data *pgdat;
-
-        if (reset_managed_pages_done)
-                return;
-
-        for_each_online_pgdat(pgdat)
-                reset_node_managed_pages(pgdat);
-
-        reset_managed_pages_done = 1;
-}
-
-/**
- * memblock_free_all - release free pages to the buddy allocator
- *
- * Return: the number of pages actually released.
- */
-unsigned long __init memblock_free_all(void)
-{
-        unsigned long pages;
-
-        reset_all_zones_managed_pages();
-
-        pages = free_low_memory_core_early();
-        totalram_pages += pages;
-
-        return pages;
-}