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x86: fix init_memory_mapping over boundary v3

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some ram-end boundary only has page alignment, instead of 2M alignment.

v2: make init_memory_mapping more solid: start could be any value other than 0
v3: fix NON PAE by handling left over in kernel_physical_mapping

Signed-off-by: Yinghai Lu <yhlu.kernel@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Yinghai Lu 2008-06-28 03:30:39 -07:00 committed by Ingo Molnar
parent df366e9822
commit 7482b0e962
1 changed files with 14 additions and 10 deletions
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22
arch/x86/mm/init_32.c
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@ -195,7 +195,7 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
unsigned pages_2m = 0, pages_4k = 0;
unsigned limit_pfn = end >> PAGE_SHIFT;
pgd_idx = pgd_index(PAGE_OFFSET);
pgd_idx = pgd_index(start + PAGE_OFFSET);
pgd = pgd_base + pgd_idx;
pfn = start >> PAGE_SHIFT;
@ -218,7 +218,8 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
* and overlapping MTRRs into large pages can cause
* slowdowns.
*/
if (cpu_has_pse && !(pgd_idx == 0 && pmd_idx == 0)) {
if (cpu_has_pse && !(pgd_idx == 0 && pmd_idx == 0) &&
(pfn + PTRS_PER_PTE) <= limit_pfn) {
unsigned int addr2;
pgprot_t prot = PAGE_KERNEL_LARGE;
@ -233,13 +234,12 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
set_pmd(pmd, pfn_pmd(pfn, prot));
pfn += PTRS_PER_PTE;
max_pfn_mapped = pfn;
continue;
}
pte = one_page_table_init(pmd);
for (pte_ofs = 0;
pte_ofs < PTRS_PER_PTE && pfn < max_low_pfn;
pte_ofs < PTRS_PER_PTE && pfn < limit_pfn;
pte++, pfn++, pte_ofs++, addr += PAGE_SIZE) {
pgprot_t prot = PAGE_KERNEL;
@ -249,7 +249,6 @@ static void __init kernel_physical_mapping_init(pgd_t *pgd_base,
pages_4k++;
set_pte(pte, pfn_pte(pfn, prot));
}
max_pfn_mapped = pfn;
}
}
update_page_count(PG_LEVEL_2M, pages_2m);
@ -729,7 +728,7 @@ void __init setup_bootmem_allocator(void)
static void __init find_early_table_space(unsigned long end)
{
unsigned long puds, pmds, tables, start;
unsigned long puds, pmds, ptes, tables, start;
puds = (end + PUD_SIZE - 1) >> PUD_SHIFT;
tables = PAGE_ALIGN(puds * sizeof(pud_t));
@ -737,10 +736,15 @@ static void __init find_early_table_space(unsigned long end)
pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT;
tables += PAGE_ALIGN(pmds * sizeof(pmd_t));
if (!cpu_has_pse) {
int ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
if (cpu_has_pse) {
unsigned long extra;
extra = end - ((end>>21) << 21);
extra += (2UL<<20);
ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT;
} else
ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT;
tables += PAGE_ALIGN(ptes * sizeof(pte_t));
}
/*
* RED-PEN putting page tables only on node 0 could