Commit 91a2fb95 authored by Sidhartha Kumar's avatar Sidhartha Kumar Committed by Andrew Morton
Browse files

mm/hugetlb: convert hugetlbfs_pagecache_present() to folios 

Refactor hugetlbfs_pagecache_present() to avoid getting and dropping a
refcount on a page.  Use RCU and page_cache_next_miss() instead.

Link: https://lkml.kernel.org/r/20230125170537.96973-3-sidhartha.kumar@oracle.com


Suggested-by: default avatarMatthew Wilcox <willy@infradead.org>
Signed-off-by: default avatarSidhartha Kumar <sidhartha.kumar@oracle.com>
Cc: Gerald Schaefer <gerald.schaefer@linux.ibm.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: kernel test robot <lkp@intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
parent ea4c353d

mm/hugetlb.c

+7 −9
Original line number Diff line number Diff line
@@ -5651,17 +5651,15 @@ static vm_fault_t hugetlb_wp(struct mm_struct *mm, struct vm_area_struct *vma, 
static bool hugetlbfs_pagecache_present(struct hstate *h,

			struct vm_area_struct *vma, unsigned long address)

{

	struct address_space *mapping;

	pgoff_t idx;

	struct page *page;

	struct address_space *mapping = vma->vm_file->f_mapping;

	pgoff_t idx = vma_hugecache_offset(h, vma, address);

	bool present;



	mapping = vma->vm_file->f_mapping;

	idx = vma_hugecache_offset(h, vma, address);

	rcu_read_lock();

	present = page_cache_next_miss(mapping, idx, 1) != idx;

	rcu_read_unlock();



	page = find_get_page(mapping, idx);

	if (page)

		put_page(page);

	return page != NULL;

	return present;

}



int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,