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    Subject[RFC PATCH 06/09] robust VM per_cpu i386 bootmem
    This patch was to get my VM percpu working on my laptop.  This patch
    still needs work to handle NUMA and other types of X86 architectures.

    Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

    Index: linux-2.6.16-test/arch/i386/mm/init.c
    ===================================================================
    --- linux-2.6.16-test.orig/arch/i386/mm/init.c 2006-05-17 04:32:28.000000000 -0400
    +++ linux-2.6.16-test/arch/i386/mm/init.c 2006-05-17 04:58:37.000000000 -0400
    @@ -772,3 +772,39 @@ void free_initrd_mem(unsigned long start
    }
    }
    #endif
    +
    +/*
    + * The following three functions are to impement per_cpu variables
    + * into VM. per_cpu variables are initialized very early on startup
    + * and before memory management. So the per_cpu initialization needs
    + * a way to allocate pages using bootmem.
    + */
    +pud_t __init *pud_boot_alloc(struct mm_struct *mm, pgd_t *pgd,
    + unsigned long addr, int cpu)
    +{
    + return (pud_t*)pgd;
    +}
    +
    +pmd_t __init *pmd_boot_alloc(struct mm_struct *mm, pud_t *pud,
    + unsigned long addr, int cpu)
    +{
    + return pmd_offset(pud, addr);
    +}
    +
    +/* FIXME - handle NUMA handling with the CPU parameter */
    +pte_t __init *pte_boot_alloc(struct mm_struct *mm, pmd_t *pmd,
    + unsigned long addr, int cpu)
    +{
    + pte_t *pte;
    +
    + if (pmd_none(*pmd)) {
    + pte = alloc_bootmem_pages(PAGE_SIZE);
    + if (!pte)
    + return NULL;
    + mm->nr_ptes++;
    + set_pmd(pmd, __pmd(__pa(pte) | _PAGE_TABLE));
    + } else
    + pte = pte_offset_kernel(pmd, addr);
    +
    + return pte;
    +}
    -
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