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[ARM] 3927/1: Allow show_mem() to work with holes in memory map. 

show_mem() was not correctly handling holes in the memory
map.  It was treating the freed sections of the map as
though they contained valid struct page entries.  This
could cause incorrect debugging output or even a kernel
panic.

This patch keeps the struct meminfo around after system
initialization so that show_mem() can use it when
scanning memory.  show_mem() now walks over each bank
of each online node, rather than assuming that each node
contains a single contiguous bank.

Signed-off-by: Ray Lehtiniemi <rayl@mail.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Ray Lehtiniemi 2006-11-07 03:19:15 +01:00 committed by Russell King
parent 6d15cb42fe
commit 5e70982750
1 changed files with 32 additions and 25 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

57
arch/arm/mm/init.c
View File

@ -32,40 +32,51 @@ extern unsigned long phys_initrd_start;
extern unsigned long phys_initrd_size;
/*
* The sole use of this is to pass memory configuration
* data from paging_init to mem_init.
* This is used to pass memory configuration data from paging_init
* to mem_init, and by show_mem() to skip holes in the memory map.
*/
static struct meminfo meminfo __initdata = { 0, };
static struct meminfo meminfo = { 0, };
#define for_each_nodebank(iter,mi,no) \
for (iter = 0; iter < mi->nr_banks; iter++) \
if (mi->bank[iter].node == no)
void show_mem(void)
{
int free = 0, total = 0, reserved = 0;
int shared = 0, cached = 0, slab = 0, node;
int shared = 0, cached = 0, slab = 0, node, i;
struct meminfo * mi = &meminfo;
printk("Mem-info:\n");
show_free_areas();
printk("Free swap: %6ldkB\n", nr_swap_pages<<(PAGE_SHIFT-10));
for_each_online_node(node) {
struct page *page, *end;
for_each_nodebank (i,mi,node) {
unsigned int pfn1, pfn2;
struct page *page, *end;
page = NODE_MEM_MAP(node);
end = page + NODE_DATA(node)->node_spanned_pages;
pfn1 = mi->bank[i].start >> PAGE_SHIFT;
pfn2 = (mi->bank[i].size + mi->bank[i].start) >> PAGE_SHIFT;
do {
total++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (PageSlab(page))
slab++;
else if (!page_count(page))
free++;
else
shared += page_count(page) - 1;
page++;
} while (page < end);
page = NODE_MEM_MAP(node) + pfn1;
end = NODE_MEM_MAP(node) + pfn2;
do {
total++;
if (PageReserved(page))
reserved++;
else if (PageSwapCache(page))
cached++;
else if (PageSlab(page))
slab++;
else if (!page_count(page))
free++;
else
shared += page_count(page) - 1;
page++;
} while (page < end);
}
}
printk("%d pages of RAM\n", total);
@ -76,10 +87,6 @@ void show_mem(void)
printk("%d pages swap cached\n", cached);
}
#define for_each_nodebank(iter,mi,no) \
for (iter = 0; iter < mi->nr_banks; iter++) \
if (mi->bank[iter].node == no)
/*
* FIXME: We really want to avoid allocating the bootmap bitmap
* over the top of the initrd. Hopefully, this is located towards