mirror of https://gitee.com/openkylin/linux.git
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: Adam Litke <agl@us.ibm.com> Signed-off-by: Jon Tollefson <kniht@linux.vnet.ibm.com> Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -29,6 +29,12 @@
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#define NUM_LOW_AREAS (0x100000000UL >> SID_SHIFT)
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#define NUM_HIGH_AREAS (PGTABLE_RANGE >> HTLB_AREA_SHIFT)
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#define MAX_NUMBER_GPAGES 1024
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/* Tracks the 16G pages after the device tree is scanned and before the
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* huge_boot_pages list is ready. */
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static unsigned long gpage_freearray[MAX_NUMBER_GPAGES];
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static unsigned nr_gpages;
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unsigned int hugepte_shift;
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#define PTRS_PER_HUGEPTE (1 << hugepte_shift)
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@ -104,6 +110,21 @@ pmd_t *hpmd_alloc(struct mm_struct *mm, pud_t *pud, unsigned long addr)
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}
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#endif
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/* Moves the gigantic page addresses from the temporary list to the
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* huge_boot_pages list. */
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int alloc_bootmem_huge_page(struct hstate *h)
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{
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struct huge_bootmem_page *m;
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if (nr_gpages == 0)
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return 0;
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m = phys_to_virt(gpage_freearray[--nr_gpages]);
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gpage_freearray[nr_gpages] = 0;
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list_add(&m->list, &huge_boot_pages);
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m->hstate = h;
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return 1;
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}
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/* Modelled after find_linux_pte() */
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pte_t *huge_pte_offset(struct mm_struct *mm, unsigned long addr)
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{
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