Commit ec4b2c0c authored by Jon Tollefson's avatar Jon Tollefson Committed by Linus Torvalds

powerpc: function to allocate gigantic hugepages

The 16G page locations have been saved during early boot in an array.  The
alloc_bootmem_huge_page() function adds a page from here to the
huge_boot_pages list.
Acked-by: default avatarAdam Litke <>
Signed-off-by: default avatarJon Tollefson <>
Signed-off-by: default avatarNick Piggin <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 53ba51d2
......@@ -29,6 +29,12 @@
#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
#define MAX_NUMBER_GPAGES 1024
/* Tracks the 16G pages after the device tree is scanned and before the
* huge_boot_pages list is ready. */
static unsigned long gpage_freearray[MAX_NUMBER_GPAGES];
static unsigned nr_gpages;
unsigned int hugepte_shift;
#define PTRS_PER_HUGEPTE (1 << hugepte_shift)
......@@ -104,6 +110,21 @@ pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr)
/* Moves the gigantic page addresses from the temporary list to the
* huge_boot_pages list. */
int alloc_bootmem_huge_page(struct hstate *h)
struct huge_bootmem_page *m;
if (nr_gpages == 0)
return 0;
m = phys_to_virt(gpage_freearray[--nr_gpages]);
gpage_freearray[nr_gpages] = 0;
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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