Commit 1008a115 authored by Mike Rapoport's avatar Mike Rapoport Committed by Geert Uytterhoeven
Browse files

m68k: switch to MEMBLOCK + NO_BOOTMEM 



In m68k the physical memory is described by [memory_start, memory_end] for
!MMU variant and by m68k_memory array of memory ranges for the MMU version.
This information is directly use to register the physical memory with
memblock.

The reserve_bootmem() calls are replaced with memblock_reserve() and the
bootmap bitmap allocation is simply dropped.

Since the MMU variant creates early mappings only for the small part of the
memory we force bottom-up allocations in memblock.

Signed-off-by: default avatarMike Rapoport <rppt@linux.vnet.ibm.com>
Acked-by: default avatarGreg Ungerer <gerg@linux-m68k.org>
Signed-off-by: default avatarGeert Uytterhoeven <geert@linux-m68k.org>
parent 9e092219

arch/m68k/Kconfig

+3 −0
Original line number Diff line number Diff line
@@ -26,6 +26,9 @@ config M68K 
	select OLD_SIGSUSPEND3

	select OLD_SIGACTION

	select DMA_NONCOHERENT_OPS if HAS_DMA

	select HAVE_MEMBLOCK

	select ARCH_DISCARD_MEMBLOCK

	select NO_BOOTMEM



config CPU_BIG_ENDIAN

	def_bool y

arch/m68k/kernel/setup_mm.c

+4 −10
Original line number Diff line number Diff line
@@ -21,6 +21,7 @@ 
#include <linux/string.h>

#include <linux/init.h>

#include <linux/bootmem.h>

#include <linux/memblock.h>

#include <linux/proc_fs.h>

#include <linux/seq_file.h>

#include <linux/module.h>
@@ -164,6 +165,8 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record) 
					be32_to_cpu(m->addr);

				m68k_memory[m68k_num_memory].size =

					be32_to_cpu(m->size);

				memblock_add(m68k_memory[m68k_num_memory].addr,

					     m68k_memory[m68k_num_memory].size);

				m68k_num_memory++;

			} else

				pr_warn("%s: too many memory chunks\n",
@@ -223,10 +226,6 @@ static void __init m68k_parse_bootinfo(const struct bi_record *record) 


void __init setup_arch(char **cmdline_p)

{

#ifndef CONFIG_SUN3

	int i;

#endif



	/* The bootinfo is located right after the kernel */

	if (!CPU_IS_COLDFIRE)

		m68k_parse_bootinfo((const struct bi_record *)_end);
@@ -355,14 +354,9 @@ void __init setup_arch(char **cmdline_p) 
#endif



#ifndef CONFIG_SUN3

	for (i = 1; i < m68k_num_memory; i++)

		free_bootmem_node(NODE_DATA(i), m68k_memory[i].addr,

				  m68k_memory[i].size);

#ifdef CONFIG_BLK_DEV_INITRD

	if (m68k_ramdisk.size) {

		reserve_bootmem_node(__virt_to_node(phys_to_virt(m68k_ramdisk.addr)),

				     m68k_ramdisk.addr, m68k_ramdisk.size,

				     BOOTMEM_DEFAULT);

		memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);

		initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);

		initrd_end = initrd_start + m68k_ramdisk.size;

		pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);

arch/m68k/kernel/setup_no.c

+4 −16
Original line number Diff line number Diff line
@@ -28,6 +28,7 @@ 
#include <linux/errno.h>

#include <linux/string.h>

#include <linux/bootmem.h>

#include <linux/memblock.h>

#include <linux/seq_file.h>

#include <linux/init.h>

#include <linux/initrd.h>
@@ -85,8 +86,6 @@ void (*mach_power_off)(void); 


void __init setup_arch(char **cmdline_p)

{

	int bootmap_size;



	memory_start = PAGE_ALIGN(_ramstart);

	memory_end = _ramend;
@@ -141,6 +140,8 @@ void __init setup_arch(char **cmdline_p) 
	pr_debug("MEMORY -> ROMFS=0x%p-0x%06lx MEM=0x%06lx-0x%06lx\n ",

		 __bss_stop, memory_start, memory_start, memory_end);



	memblock_add(memory_start, memory_end - memory_start);



	/* Keep a copy of command line */

	*cmdline_p = &command_line[0];

	memcpy(boot_command_line, command_line, COMMAND_LINE_SIZE);
@@ -157,23 +158,10 @@ void __init setup_arch(char **cmdline_p) 
	min_low_pfn = PFN_DOWN(memory_start);

	max_pfn = max_low_pfn = PFN_DOWN(memory_end);



	bootmap_size = init_bootmem_node(

			NODE_DATA(0),

			min_low_pfn,		/* map goes here */

			PFN_DOWN(PAGE_OFFSET),

			max_pfn);

	/*

	 * Free the usable memory, we have to make sure we do not free

	 * the bootmem bitmap so we then reserve it after freeing it :-)

	 */

	free_bootmem(memory_start, memory_end - memory_start);

	reserve_bootmem(memory_start, bootmap_size, BOOTMEM_DEFAULT);



#if defined(CONFIG_UBOOT) && defined(CONFIG_BLK_DEV_INITRD)

	if ((initrd_start > 0) && (initrd_start < initrd_end) &&

			(initrd_end < memory_end))

		reserve_bootmem(initrd_start, initrd_end - initrd_start,

				 BOOTMEM_DEFAULT);

		memblock_reserve(initrd_start, initrd_end - initrd_start);

#endif /* if defined(CONFIG_BLK_DEV_INITRD) */



	/*

arch/m68k/mm/init.c

+0 −1
Original line number Diff line number Diff line
@@ -71,7 +71,6 @@ void __init m68k_setup_node(int node) 
		pg_data_table[i] = pg_data_map + node;

	}

#endif

	pg_data_map[node].bdata = bootmem_node_data + node;

	node_set_online(node);

}

arch/m68k/mm/mcfmmu.c

+7 −6
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ 
#include <linux/init.h>

#include <linux/string.h>

#include <linux/bootmem.h>

#include <linux/memblock.h>



#include <asm/setup.h>

#include <asm/page.h>
@@ -153,31 +154,31 @@ int cf_tlb_miss(struct pt_regs *regs, int write, int dtlb, int extension_word) 


void __init cf_bootmem_alloc(void)

{

	unsigned long start_pfn;

	unsigned long memstart;



	/* _rambase and _ramend will be naturally page aligned */

	m68k_memory[0].addr = _rambase;

	m68k_memory[0].size = _ramend - _rambase;



	memblock_add(m68k_memory[0].addr, m68k_memory[0].size);



	/* compute total pages in system */

	num_pages = PFN_DOWN(_ramend - _rambase);



	/* page numbers */

	memstart = PAGE_ALIGN(_ramstart);

	min_low_pfn = PFN_DOWN(_rambase);

	start_pfn = PFN_DOWN(memstart);

	max_pfn = max_low_pfn = PFN_DOWN(_ramend);

	high_memory = (void *)_ramend;



	/* Reserve kernel text/data/bss */

	memblock_reserve(memstart, memstart - _rambase);



	m68k_virt_to_node_shift = fls(_ramend - 1) - 6;

	module_fixup(NULL, __start_fixup, __stop_fixup);



	/* setup bootmem data */

	/* setup node data */

	m68k_setup_node(0);

	memstart += init_bootmem_node(NODE_DATA(0), start_pfn,

		min_low_pfn, max_low_pfn);

	free_bootmem_node(NODE_DATA(0), memstart, _ramend - memstart);

}



/*

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