Re: [PATCH 3/8] hugetlb: rename remove_huge_page to hugetlb_delete_from_page_cache

Miaohe Lin
2022-08-27T03:08:18Z

On 2022/8/25 1:57, Mike Kravetz wrote:
> remove_huge_page removes a hugetlb page from the page cache. Change
> to hugetlb_delete_from_page_cache as it is a more descriptive name.
> huge_add_to_page_cache is global in scope, but only deals with hugetlb
> pages. For consistency and clarity, rename to hugetlb_add_to_page_cache.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>

LGTM with one nit below. Thanks.

> ---
> fs/hugetlbfs/inode.c | 21 ++++++++++-----------
> include/linux/hugetlb.h | 2 +-
> mm/hugetlb.c | 8 ++++----
> 3 files changed, 15 insertions(+), 16 deletions(-)
>
> diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
> index dfb735a91bbb..d98c6edbd1a4 100644
> --- a/fs/hugetlbfs/inode.c
> +++ b/fs/hugetlbfs/inode.c
> @@ -364,7 +364,7 @@ static int hugetlbfs_write_end(struct file *file, struct address_space *mapping,
> return -EINVAL;
> }
>
> -static void remove_huge_page(struct page *page)
> +static void hugetlb_delete_from_page_cache(struct page *page)
> {
> ClearPageDirty(page);
> ClearPageUptodate(page);
> @@ -478,15 +478,14 @@ static void remove_inode_hugepages(struct inode *inode, loff_t lstart,
> folio_lock(folio);
> /*
> * We must free the huge page and remove from page
> - * cache (remove_huge_page) BEFORE removing the
> - * region/reserve map (hugetlb_unreserve_pages). In
> - * rare out of memory conditions, removal of the
> - * region/reserve map could fail. Correspondingly,
> - * the subpool and global reserve usage count can need
> - * to be adjusted.
> + * cache BEFORE removing the * region/reserve map

s/the * region/the region/, i.e. remove extra "*".

Reviewed-by: Miaohe Lin <linmiaohe@huawei.com>

Thanks,
Miaohe Lin

> + * (hugetlb_unreserve_pages). In rare out of memory
> + * conditions, removal of the region/reserve map could
> + * fail. Correspondingly, the subpool and global
> + * reserve usage count can need to be adjusted.
> */
> VM_BUG_ON(HPageRestoreReserve(&folio->page));
> - remove_huge_page(&folio->page);
> + hugetlb_delete_from_page_cache(&folio->page);
> freed++;
> if (!truncate_op) {
> if (unlikely(hugetlb_unreserve_pages(inode,
> @@ -723,7 +722,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
> }
> clear_huge_page(page, addr, pages_per_huge_page(h));
> __SetPageUptodate(page);
> - error = huge_add_to_page_cache(page, mapping, index);
> + error = hugetlb_add_to_page_cache(page, mapping, index);
> if (unlikely(error)) {
> restore_reserve_on_error(h, &pseudo_vma, addr, page);
> put_page(page);
> @@ -735,7 +734,7 @@ static long hugetlbfs_fallocate(struct file *file, int mode, loff_t offset,
>
> SetHPageMigratable(page);
> /*
> - * unlock_page because locked by huge_add_to_page_cache()
> + * unlock_page because locked by hugetlb_add_to_page_cache()
> * put_page() due to reference from alloc_huge_page()
> */
> unlock_page(page);
> @@ -980,7 +979,7 @@ static int hugetlbfs_error_remove_page(struct address_space *mapping,
> struct inode *inode = mapping->host;
> pgoff_t index = page->index;
>
> - remove_huge_page(page);
> + hugetlb_delete_from_page_cache(page);
> if (unlikely(hugetlb_unreserve_pages(inode, index, index + 1, 1)))
> hugetlb_fix_reserve_counts(inode);
>
> diff --git a/include/linux/hugetlb.h b/include/linux/hugetlb.h
> index 3ec981a0d8b3..acace1a25226 100644
> --- a/include/linux/hugetlb.h
> +++ b/include/linux/hugetlb.h
> @@ -665,7 +665,7 @@ struct page *alloc_huge_page_nodemask(struct hstate *h, int preferred_nid,
> nodemask_t *nmask, gfp_t gfp_mask);
> struct page *alloc_huge_page_vma(struct hstate *h, struct vm_area_struct *vma,
> unsigned long address);
> -int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
> +int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
> pgoff_t idx);
> void restore_reserve_on_error(struct hstate *h, struct vm_area_struct *vma,
> unsigned long address, struct page *page);
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 95c6f9a5bbf0..11c02513588c 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -5445,7 +5445,7 @@ static bool hugetlbfs_pagecache_present(struct hstate *h,
> return page != NULL;
> }
>
> -int huge_add_to_page_cache(struct page *page, struct address_space *mapping,
> +int hugetlb_add_to_page_cache(struct page *page, struct address_space *mapping,
> pgoff_t idx)
> {
> struct folio *folio = page_folio(page);
> @@ -5586,7 +5586,7 @@ static vm_fault_t hugetlb_no_page(struct mm_struct *mm,
> new_page = true;
>
> if (vma->vm_flags & VM_MAYSHARE) {
> - int err = huge_add_to_page_cache(page, mapping, idx);
> + int err = hugetlb_add_to_page_cache(page, mapping, idx);
> if (err) {
> restore_reserve_on_error(h, vma, haddr, page);
> put_page(page);
> @@ -5993,11 +5993,11 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
>
> /*
> * Serialization between remove_inode_hugepages() and
> - * huge_add_to_page_cache() below happens through the
> + * hugetlb_add_to_page_cache() below happens through the
> * hugetlb_fault_mutex_table that here must be hold by
> * the caller.
> */
> - ret = huge_add_to_page_cache(page, mapping, idx);
> + ret = hugetlb_add_to_page_cache(page, mapping, idx);
> if (ret)
> goto out_release_nounlock;
> page_in_pagecache = true;
>