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authorFranck Bui-Huu <fbuihuu@gmail.com>2007-01-10 09:44:04 +0100
committerRalf Baechle <ralf@linux-mips.org>2007-02-06 16:53:13 +0000
commitdb84dc61552ae0d198a8133d28b80c3838930ba8 (patch)
treea2aed3a3d8789f297285c153ecc352ed6c8acb22 /arch/mips/kernel/setup.c
parenta583158c9ce822c96a718fbf877cec1e5f9ad75d (diff)
[MIPS] Setup min_low_pfn/max_low_pfn correctly
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>
Diffstat (limited to 'arch/mips/kernel/setup.c')
-rw-r--r--arch/mips/kernel/setup.c36
1 files changed, 27 insertions, 9 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 89440a0d8528..f352cd9c834b 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -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;
@@ -284,6 +283,13 @@ 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.
*/
for (i = 0; i < boot_mem_map.nr_map; i++) {
@@ -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.
*/