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
24bool __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
35static __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}
42arch_initcall(gigantic_pages_init);
43#endif
44#endif