On Thu, Oct 18, 2012 at 01:50:24PM -0700, Yinghai Lu wrote:
> On 32bit, We should not keep calling that during every init_memory_mapping.
Explain pls why.
>
> Need to update page_table_range_init() to count the pages for kmap page table
> at first, and use new added alloc_low_pages() to get pages in sequence.
> That will conform requirement that page table need to be in low to high order.
^ to the ^-s
>
> Signed-off-by: Yinghai Lu <ying...@kernel.org>
> ---
> arch/x86/mm/init.c | 13 +++++--------
> arch/x86/mm/init_32.c | 47 +++++++++++++++++++++++++++++++++++++++++------
> 2 files changed, 46 insertions(+), 14 deletions(-)
>
> diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
> index de71c0d..4eece3c 100644
> --- a/arch/x86/mm/init.c
> +++ b/arch/x86/mm/init.c
> @@ -334,14 +334,6 @@ unsigned long __init_refok init_memory_mapping(unsigned
> long start,
> ret = kernel_physical_mapping_init(mr[i].start, mr[i].end,
> mr[i].page_size_mask);
>
> -#ifdef CONFIG_X86_32
> - early_ioremap_page_table_range_init();
> -
> - load_cr3(swapper_pg_dir);
> -#endif
> -
> - __flush_tlb_all();
> -
> add_pfn_range_mapped(start >> PAGE_SHIFT, ret >> PAGE_SHIFT);
>
> return ret >> PAGE_SHIFT;
> @@ -435,7 +427,12 @@ void __init init_mem_mapping(void)
> /* can we preseve max_low_pfn ?*/
> max_low_pfn = max_pfn;
> }
> +#else
> + early_ioremap_page_table_range_init();
> + load_cr3(swapper_pg_dir);
> + __flush_tlb_all();
> #endif
> +
> early_memtest(0, max_pfn_mapped << PAGE_SHIFT);
> }
>
> diff --git a/arch/x86/mm/init_32.c b/arch/x86/mm/init_32.c
> index a7f2df1..ef7f0dc 100644
> --- a/arch/x86/mm/init_32.c
> +++ b/arch/x86/mm/init_32.c
> @@ -135,8 +135,39 @@ pte_t * __init populate_extra_pte(unsigned long vaddr)
> return one_page_table_init(pmd) + pte_idx;
> }
>
> +static unsigned long __init
> +page_table_range_init_count(unsigned long start, unsigned long end)
> +{
> + unsigned long count = 0;
> +#ifdef CONFIG_HIGHMEM
> + int pmd_idx_kmap_begin = fix_to_virt(FIX_KMAP_END) >> PMD_SHIFT;
> + int pmd_idx_kmap_end = fix_to_virt(FIX_KMAP_BEGIN) >> PMD_SHIFT;
> + int pgd_idx, pmd_idx;
> + unsigned long vaddr;
> +
> + if (pmd_idx_kmap_begin == pmd_idx_kmap_end)
> + return count;
Or just 'return 0';
--
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