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[MIPS] Setup min_low_pfn/max_low_pfn correctly

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This patch makes a better usage of these two globals.
'min_low_pfn' is now correctly setup for all configs, which
allow us to rely on it in boot memory code init.

Signed-off-by: Franck Bui-Huu <fbuihuu@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
This commit is contained in:
Franck Bui-Huu 2007-01-10 09:44:04 +01:00 • committed by Ralf Baechle
parent a583158c9c
commit db84dc6155
3 changed files with 39 additions and 21 deletions
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36
arch/mips/kernel/setup.c
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@ -271,8 +271,7 @@ static void __init bootmem_init(void)
static void __init bootmem_init(void)
{
unsigned long reserved_end;
unsigned long highest = 0;
unsigned long mapstart = -1UL;
unsigned long mapstart = ~0UL;
unsigned long bootmap_size;
int i;
@ -283,6 +282,13 @@ static void __init bootmem_init(void)
*/
reserved_end = max(init_initrd(), PFN_UP(__pa_symbol(&_end)));
/*
* max_low_pfn is not a number of pages. The number of pages
* of the system is given by 'max_low_pfn - min_low_pfn'.
*/
min_low_pfn = ~0UL;
max_low_pfn = 0;
/*
* Find the highest page frame number we have available.
*/
@ -296,8 +302,10 @@ static void __init bootmem_init(void)
end = PFN_DOWN(boot_mem_map.map[i].addr
+ boot_mem_map.map[i].size);
if (end > highest)
highest = end;
if (end > max_low_pfn)
max_low_pfn = end;
if (start < min_low_pfn)
min_low_pfn = start;
if (end <= reserved_end)
continue;
if (start >= mapstart)
@ -305,22 +313,32 @@ static void __init bootmem_init(void)
mapstart = max(reserved_end, start);
}
if (min_low_pfn >= max_low_pfn)
panic("Incorrect memory mapping !!!");
if (min_low_pfn > 0) {
printk(KERN_INFO
"Wasting %lu bytes for tracking %lu unused pages\n",
min_low_pfn * sizeof(struct page),
min_low_pfn);
min_low_pfn = 0;
}
/*
* Determine low and high memory ranges
*/
if (highest > PFN_DOWN(HIGHMEM_START)) {
if (max_low_pfn > PFN_DOWN(HIGHMEM_START)) {
#ifdef CONFIG_HIGHMEM
highstart_pfn = PFN_DOWN(HIGHMEM_START);
highend_pfn = highest;
highend_pfn = max_low_pfn;
#endif
highest = PFN_DOWN(HIGHMEM_START);
max_low_pfn = PFN_DOWN(HIGHMEM_START);
}
/*
* Initialize the boot-time allocator with low memory only.
*/
bootmap_size = init_bootmem(mapstart, highest);
bootmap_size = init_bootmem_node(NODE_DATA(0), mapstart,
min_low_pfn, max_low_pfn);
/*
* Register fully available low RAM pages with the bootmem allocator.
*/