From c2e6d65bcea2672788f9bb58ce7606c41388387b Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Tue, 8 Jul 2008 01:43:27 -0700 Subject: x86: not overmap more than the end of RAM in init_memory_mapping - 64bit handle head and tail that are not aligned to big pages (2MB/1GB boundary). with this patch, on system that support gbpages, change: last_map_addr: 1080000000 end: 1078000000 to: last_map_addr: 1078000000 end: 1078000000 Signed-off-by: Yinghai Lu Signed-off-by: Ingo Molnar --- arch/x86/mm/init_64.c | 77 +++++++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 65 insertions(+), 12 deletions(-) (limited to 'arch/x86/mm') diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c index f7d80313ede..51f69b39b75 100644 --- a/arch/x86/mm/init_64.c +++ b/arch/x86/mm/init_64.c @@ -462,18 +462,25 @@ phys_pud_update(pgd_t *pgd, unsigned long addr, unsigned long end, static void __init find_early_table_space(unsigned long end) { - unsigned long puds, tables, start; + unsigned long puds, pmds, ptes, tables, start; puds = (end + PUD_SIZE - 1) >> PUD_SHIFT; tables = round_up(puds * sizeof(pud_t), PAGE_SIZE); - if (!direct_gbpages) { - unsigned long pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; - tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); - } - if (!cpu_has_pse) { - unsigned long ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; - tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE); - } + if (direct_gbpages) { + unsigned long extra; + extra = end - ((end>>PUD_SHIFT) << PUD_SHIFT); + pmds = (extra + PMD_SIZE - 1) >> PMD_SHIFT; + } else + pmds = (end + PMD_SIZE - 1) >> PMD_SHIFT; + tables += round_up(pmds * sizeof(pmd_t), PAGE_SIZE); + + if (cpu_has_pse) { + unsigned long extra; + extra = end - ((end>>PMD_SHIFT) << PMD_SHIFT); + ptes = (extra + PAGE_SIZE - 1) >> PAGE_SHIFT; + } else + ptes = (end + PAGE_SIZE - 1) >> PAGE_SHIFT; + tables += round_up(ptes * sizeof(pte_t), PAGE_SIZE); /* * RED-PEN putting page tables only on node 0 could @@ -660,8 +667,9 @@ static unsigned long __init kernel_physical_mapping_init(unsigned long start, unsigned long __init_refok init_memory_mapping(unsigned long start, unsigned long end) { - unsigned long last_map_addr; + unsigned long last_map_addr = end; unsigned long page_size_mask = 0; + unsigned long start_pfn, end_pfn; printk(KERN_INFO "init_memory_mapping\n"); @@ -682,8 +690,53 @@ unsigned long __init_refok init_memory_mapping(unsigned long start, if (cpu_has_pse) page_size_mask |= 1 << PG_LEVEL_2M; - last_map_addr = kernel_physical_mapping_init(start, end, - page_size_mask); + /* head if not big page aligment ?*/ + start_pfn = start >> PAGE_SHIFT; + end_pfn = ((start + (PMD_SIZE - 1)) >> PMD_SHIFT) + << (PMD_SHIFT - PAGE_SHIFT); + if (start_pfn < end_pfn) + last_map_addr = kernel_physical_mapping_init( + start_pfn<>PMD_SHIFT) + << (PMD_SHIFT - PAGE_SHIFT); + end_pfn = ((start + (PUD_SIZE - 1))>>PUD_SHIFT) + << (PUD_SHIFT - PAGE_SHIFT); + if (end_pfn > ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT))) + end_pfn = ((end>>PUD_SHIFT)<<(PUD_SHIFT - PAGE_SHIFT)); + if (start_pfn < end_pfn) + last_map_addr = kernel_physical_mapping_init( + start_pfn<>PUD_SHIFT) << (PUD_SHIFT - PAGE_SHIFT); + if (start_pfn < end_pfn) + last_map_addr = kernel_physical_mapping_init( + start_pfn<>PMD_SHIFT) << (PMD_SHIFT - PAGE_SHIFT); + if (start_pfn < end_pfn) + last_map_addr = kernel_physical_mapping_init( + start_pfn<>PAGE_SHIFT; + if (start_pfn < end_pfn) + last_map_addr = kernel_physical_mapping_init( + start_pfn<