lkml.org 
[lkml]   [2008]   [Mar]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    Patch in this message
    /
    Date
    From
    Subject[PATCH 2/4] powerpc: function for allocating gigantic pages
    The 16G page locations have been saved during early boot in an array.  The
    alloc_bm_huge_page() function adds a page from here to the huge_boot_pages list.


    Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com>
    ---


    hugetlbpage.c | 19 +++++++++++++++++++
    1 file changed, 19 insertions(+)

    diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
    index 94625db..31d977b 100644
    --- a/arch/powerpc/mm/hugetlbpage.c
    +++ b/arch/powerpc/mm/hugetlbpage.c
    @@ -29,6 +29,10 @@

    #define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
    #define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT)
    +#define MAX_NUMBER_GPAGES 1024
    +
    +static void *gpage_freearray[MAX_NUMBER_GPAGES];
    +static unsigned nr_gpages;

    unsigned int hugepte_shift;
    #define PTRS_PER_HUGEPTE (1 << hugepte_shift)
    @@ -104,6 +108,21 @@ pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr)
    }
    #endif

    +/* Put 16G page address into temporary huge page list because the mem_map
    + * is not up yet.
    + */
    +int alloc_bm_huge_page(struct hstate *h)
    +{
    + struct huge_bm_page *m;
    + if (nr_gpages == 0)
    + return 0;
    + m = gpage_freearray[--nr_gpages];
    + list_add(&m->list, &huge_boot_pages);
    + m->hstate = h;
    + return 1;
    +}
    +
    +
    /* Modelled after find_linux_pte() */
    pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
    {




    \
     
     \ /
      Last update: 2008-03-26 22:31    [W:0.058 / U:29.764 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site