root/arch/riscv/mm/hugetlbpage.c

DEFINITIONS

1. pud_huge
2. pmd_huge
3. setup_hugepagesz
4. gigantic_pages_init

   1 // SPDX-License-Identifier: GPL-2.0
   2 #include <linux/hugetlb.h>
   3 #include <linux/err.h>
   4 
   5 int pud_huge(pud_t pud)
   6 {
   7         return pud_present(pud) &&
   8                 (pud_val(pud) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
   9 }
  10 
  11 int pmd_huge(pmd_t pmd)
  12 {
  13         return pmd_present(pmd) &&
  14                 (pmd_val(pmd) & (_PAGE_READ | _PAGE_WRITE | _PAGE_EXEC));
  15 }
  16 
  17 static __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
  36 static __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 }
  43 arch_initcall(gigantic_pages_init);
  44 #endif