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mm: sparsemem: use huge PMD mapping for vmemmap pages

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The preparation of splitting huge PMD mapping of vmemmap pages is ready,
so switch the mapping from PTE to PMD.

Link: https://lkml.kernel.org/r/20210616094915.34432-3-songmuchun@bytedance.com
Signed-off-by: Muchun Song <songmuchun@bytedance.com>
Reviewed-by: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Chen Huang <chenhuang5@huawei.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oscar Salvador <osalvador@suse.de>
Cc: Xiongchun Duan <duanxiongchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Muchun Song 2021-06-30 18:48:25 -07:00 • committed by Linus Torvalds
parent 3bc2b6a725
commit 2d7a21715f
4 changed files with 9 additions and 33 deletions
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25
include/linux/hugetlb.h
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@ -895,20 +895,6 @@ static inline void huge_ptep_modify_prot_commit(struct vm_area_struct *vma,
}
#endif
#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
extern bool hugetlb_free_vmemmap_enabled;
static inline bool is_hugetlb_free_vmemmap_enabled(void)
{
return hugetlb_free_vmemmap_enabled;
}
#else
static inline bool is_hugetlb_free_vmemmap_enabled(void)
{
return false;
}
#endif
#else /* CONFIG_HUGETLB_PAGE */
struct hstate {};
@ -1063,13 +1049,14 @@ static inline void set_huge_swap_pte_at(struct mm_struct *mm, unsigned long addr
pte_t *ptep, pte_t pte, unsigned long sz)
{
}
static inline bool is_hugetlb_free_vmemmap_enabled(void)
{
return false;
}
#endif /* CONFIG_HUGETLB_PAGE */
#ifdef CONFIG_HUGETLB_PAGE_FREE_VMEMMAP
extern bool hugetlb_free_vmemmap_enabled;
#else
#define hugetlb_free_vmemmap_enabled false
#endif
static inline spinlock_t *huge_pte_lock(struct hstate *h,
struct mm_struct *mm, pte_t *pte)
{