linux/arch/h8300/mm/init.c
Michal Hocko 8745808fda mm, arch: remove empty_bad_page*
empty_bad_page() and empty_bad_pte_table() seem to be relics from old
days which is not used by any code for a long time.  I have tried to
find when exactly but this is not really all that straightforward due to
many code movements - traces disappear around 2.4 times.

Anyway no code really references neither empty_bad_page nor
empty_bad_pte_table.  We only allocate the storage which is not used by
anybody so remove them.

Link: http://lkml.kernel.org/r/20171004150045.30755-1-mhocko@kernel.org
Signed-off-by: Michal Hocko <mhocko@suse.com>
Acked-by: Ralf Baechle <ralf@linus-mips.org>
Acked-by: Ingo Molnar <mingo@kernel.org>
Cc: Yoshinori Sato <ysato@users.sourceforge.jp>
Cc: David Howells <dhowells@redhat.com>
Cc: Rich Felker <dalias@libc.org>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2017-11-15 18:21:03 -08:00

117 lines
2.7 KiB
C

// SPDX-License-Identifier: GPL-2.0
/*
* linux/arch/h8300/mm/init.c
*
* Copyright (C) 1998 D. Jeff Dionne <jeff@lineo.ca>,
* Kenneth Albanowski <kjahds@kjahds.com>,
* Copyright (C) 2000 Lineo, Inc. (www.lineo.com)
*
* Based on:
*
* linux/arch/m68knommu/mm/init.c
* linux/arch/m68k/mm/init.c
*
* Copyright (C) 1995 Hamish Macdonald
*
* JAN/1999 -- hacked to support ColdFire (gerg@snapgear.com)
* DEC/2000 -- linux 2.4 support <davidm@snapgear.com>
*/
#include <linux/signal.h>
#include <linux/sched.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/ptrace.h>
#include <linux/mman.h>
#include <linux/mm.h>
#include <linux/swap.h>
#include <linux/init.h>
#include <linux/highmem.h>
#include <linux/pagemap.h>
#include <linux/bootmem.h>
#include <linux/gfp.h>
#include <asm/setup.h>
#include <asm/segment.h>
#include <asm/page.h>
#include <asm/pgtable.h>
#include <asm/sections.h>
/*
* ZERO_PAGE is a special page that is used for zero-initialized
* data and COW.
*/
unsigned long empty_zero_page;
/*
* paging_init() continues the virtual memory environment setup which
* was begun by the code in arch/head.S.
* The parameters are pointers to where to stick the starting and ending
* addresses of available kernel virtual memory.
*/
void __init paging_init(void)
{
/*
* Make sure start_mem is page aligned, otherwise bootmem and
* page_alloc get different views og the world.
*/
unsigned long start_mem = PAGE_ALIGN(memory_start);
unsigned long end_mem = memory_end & PAGE_MASK;
pr_debug("start_mem is %#lx\nvirtual_end is %#lx\n",
start_mem, end_mem);
/*
* Initialize the bad page table and bad page to point
* to a couple of allocated pages.
*/
empty_zero_page = (unsigned long)alloc_bootmem_pages(PAGE_SIZE);
memset((void *)empty_zero_page, 0, PAGE_SIZE);
/*
* Set up SFC/DFC registers (user data space).
*/
set_fs(USER_DS);
pr_debug("before free_area_init\n");
pr_debug("free_area_init -> start_mem is %#lx\nvirtual_end is %#lx\n",
start_mem, end_mem);
{
unsigned long zones_size[MAX_NR_ZONES] = {0, };
zones_size[ZONE_NORMAL] = (end_mem - PAGE_OFFSET) >> PAGE_SHIFT;
free_area_init(zones_size);
}
}
void __init mem_init(void)
{
pr_devel("Mem_init: start=%lx, end=%lx\n", memory_start, memory_end);
high_memory = (void *) (memory_end & PAGE_MASK);
max_mapnr = MAP_NR(high_memory);
/* this will put all low memory onto the freelists */
free_all_bootmem();
mem_init_print_info(NULL);
}
#ifdef CONFIG_BLK_DEV_INITRD
void free_initrd_mem(unsigned long start, unsigned long end)
{
free_reserved_area((void *)start, (void *)end, -1, "initrd");
}
#endif
void
free_initmem(void)
{
free_initmem_default(-1);
}