mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-30 23:54:04 +08:00
ded0014274
This off by one bug is harmless but it upsets the static checkers and the
code is obvious so it doesn't hurt to fix it. The Smatch warning is:
arch/sh/mm/numa.c:47 setup_bootmem_node()
error: buffer overflow 'node_data' 1024 <= 1024
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Paul Mundt <lethal@linux-sh.org>
Acked-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
76 lines
2.3 KiB
C
76 lines
2.3 KiB
C
/*
|
|
* arch/sh/mm/numa.c - Multiple node support for SH machines
|
|
*
|
|
* Copyright (C) 2007 Paul Mundt
|
|
*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*/
|
|
#include <linux/module.h>
|
|
#include <linux/bootmem.h>
|
|
#include <linux/memblock.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/numa.h>
|
|
#include <linux/pfn.h>
|
|
#include <asm/sections.h>
|
|
|
|
struct pglist_data *node_data[MAX_NUMNODES] __read_mostly;
|
|
EXPORT_SYMBOL_GPL(node_data);
|
|
|
|
/*
|
|
* On SH machines the conventional approach is to stash system RAM
|
|
* in node 0, and other memory blocks in to node 1 and up, ordered by
|
|
* latency. Each node's pgdat is node-local at the beginning of the node,
|
|
* immediately followed by the node mem map.
|
|
*/
|
|
void __init setup_bootmem_node(int nid, unsigned long start, unsigned long end)
|
|
{
|
|
unsigned long bootmap_pages;
|
|
unsigned long start_pfn, end_pfn;
|
|
unsigned long bootmem_paddr;
|
|
|
|
/* Don't allow bogus node assignment */
|
|
BUG_ON(nid >= MAX_NUMNODES || nid <= 0);
|
|
|
|
start_pfn = start >> PAGE_SHIFT;
|
|
end_pfn = end >> PAGE_SHIFT;
|
|
|
|
pmb_bolt_mapping((unsigned long)__va(start), start, end - start,
|
|
PAGE_KERNEL);
|
|
|
|
memblock_add(start, end - start);
|
|
|
|
__add_active_range(nid, start_pfn, end_pfn);
|
|
|
|
/* Node-local pgdat */
|
|
NODE_DATA(nid) = __va(memblock_alloc_base(sizeof(struct pglist_data),
|
|
SMP_CACHE_BYTES, end));
|
|
memset(NODE_DATA(nid), 0, sizeof(struct pglist_data));
|
|
|
|
NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
|
|
NODE_DATA(nid)->node_start_pfn = start_pfn;
|
|
NODE_DATA(nid)->node_spanned_pages = end_pfn - start_pfn;
|
|
|
|
/* Node-local bootmap */
|
|
bootmap_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
|
|
bootmem_paddr = memblock_alloc_base(bootmap_pages << PAGE_SHIFT,
|
|
PAGE_SIZE, end);
|
|
init_bootmem_node(NODE_DATA(nid), bootmem_paddr >> PAGE_SHIFT,
|
|
start_pfn, end_pfn);
|
|
|
|
free_bootmem_with_active_regions(nid, end_pfn);
|
|
|
|
/* Reserve the pgdat and bootmap space with the bootmem allocator */
|
|
reserve_bootmem_node(NODE_DATA(nid), start_pfn << PAGE_SHIFT,
|
|
sizeof(struct pglist_data), BOOTMEM_DEFAULT);
|
|
reserve_bootmem_node(NODE_DATA(nid), bootmem_paddr,
|
|
bootmap_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
|
|
|
|
/* It's up */
|
|
node_set_online(nid);
|
|
|
|
/* Kick sparsemem */
|
|
sparse_memory_present_with_active_regions(nid);
|
|
}
|