LXR linux/arch/riscv/mm/hugetlbpage.c

   1// SPDX-License-Identifier: GPL-2.0
   2#include <linux/hugetlb.h>
   3#include <linux/err.h>
   4
   5int pud_huge(pud_t pud)
   6{
   7        return pud_present(pud) &&
   8                (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
   9}
  10
  11int pmd_huge(pmd_t pmd)
  12{
  13        return pmd_present(pmd) &&
  14                (pmd_val(pmd) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
  15}
  16
  17static __init int setup_hugepagesz(char *opt)
  18{
  19        unsigned long ps = memparse(opt, &opt);
  20
  21        if (ps == HPAGE_SIZE) {
  22                hugetlb_add_hstate(HPAGE_SHIFT - PAGE_SHIFT);
  23        } else if (IS_ENABLED(CONFIG_64BIT) && ps == PUD_SIZE) {
  24                hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
  25        } else {
  26                hugetlb_bad_size();
  27                pr_err("hugepagesz: Unsupported page size %lu M\n", ps >> 20);
  28                return 0;
  29        }
  30
  31        return 1;
  32}
  33__setup("hugepagesz=", setup_hugepagesz);
  34
  35#ifdef CONFIG_CONTIG_ALLOC
  36static __init int gigantic_pages_init(void)
  37{
  38        /* With CONTIG_ALLOC, we can allocate gigantic pages at runtime */
  39        if (IS_ENABLED(CONFIG_64BIT) && !size_to_hstate(1UL << PUD_SHIFT))
  40                hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
  41        return 0;
  42}
  43arch_initcall(gigantic_pages_init);
  44#endif
  45