arch/x86/mm/hugetlbpage.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * IA-32 Huge TLB Page Support for Kernel.
   4  *
   5  * Copyright (C) 2002, Rohit Seth <rohit.seth@intel.com>
   6  */
   7
   8 #include <linux/init.h>
   9 #include <linux/fs.h>
  10 #include <linux/mm.h>
  11 #include <linux/sched/mm.h>
  12 #include <linux/hugetlb.h>
  13 #include <linux/pagemap.h>
  14 #include <linux/err.h>
  15 #include <linux/sysctl.h>
  16 #include <linux/compat.h>
  17 #include <asm/mman.h>
  18 #include <asm/tlb.h>
  19 #include <asm/tlbflush.h>
  20 #include <asm/elf.h>
  21
  22
  23 #ifdef CONFIG_X86_64
  24 bool __init arch_hugetlb_valid_size(unsigned long size)
  25 {
  26         if (size == PMD_SIZE)
  27                 return true;
  28         else if (size == PUD_SIZE && boot_cpu_has(X86_FEATURE_GBPAGES))
  29                 return true;
  30         else
  31                 return false;
  32 }
  33
  34 #ifdef CONFIG_CONTIG_ALLOC
  35 static __init int gigantic_pages_init(void)
  36 {
  37         /* With compaction or CMA we can allocate gigantic pages at runtime */
  38         if (boot_cpu_has(X86_FEATURE_GBPAGES))
  39                 hugetlb_add_hstate(PUD_SHIFT - PAGE_SHIFT);
  40         return 0;
  41 }
  42 arch_initcall(gigantic_pages_init);
  43 #endif
  44 #endif