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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)
{




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