Commit 3ae77f43 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
Browse files

mm: hugetlbfs_pagecache_present

Rename hugetlbfs_backed() to hugetlbfs_pagecache_present()
and add more comments, as suggested by Mel Gorman.
Signed-off-by: default avatarHugh Dickins <>
Cc: Rik van Riel <>
Cc: KAMEZAWA Hiroyuki <>
Cc: KOSAKI Motohiro <>
Cc: Nick Piggin <>
Cc: Mel Gorman <>
Cc: Minchan Kim <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 6e919717
......@@ -2016,8 +2016,11 @@ static struct page *hugetlbfs_pagecache_page(struct hstate *h,
return find_lock_page(mapping, idx);
/* Return whether there is a pagecache page to back given address within VMA */
static bool hugetlbfs_backed(struct hstate *h,
* Return whether there is a pagecache page to back given address within VMA.
* Caller follow_hugetlb_page() holds page_table_lock so we cannot lock_page.
static bool hugetlbfs_pagecache_present(struct hstate *h,
struct vm_area_struct *vma, unsigned long address)
struct address_space *mapping;
......@@ -2254,10 +2257,13 @@ int follow_hugetlb_page(struct mm_struct *mm, struct vm_area_struct *vma,
* When coredumping, it suits get_dump_page if we just return
* an error if there's a hole and no huge pagecache to back it.
* an error where there's an empty slot with no huge pagecache
* to back it. This way, we avoid allocating a hugepage, and
* the sparse dumpfile avoids allocating disk blocks, but its
* huge holes still show up with zeroes where they need to be.
if (absent &&
((flags & FOLL_DUMP) && !hugetlbfs_backed(h, vma, vaddr))) {
if (absent && (flags & FOLL_DUMP) &&
!hugetlbfs_pagecache_present(h, vma, vaddr)) {
remainder = 0;
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment