powerpc: function to allocate gigantic hugepages (ec4b2c0c) · Commits · 戴 / test

arch/powerpc/mm/hugetlbpage.c

+21 −0

Original line number	Diff line number	Diff line
		@@ -29,6 +29,12 @@

		#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
		#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_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)
		}
		#endif

		/* 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)
		{