On Mon, Dec 13, 2021 at 03:14:27PM +1100, NeilBrown wrote:
> diff --git a/mm/vmscan.c b/mm/vmscan.c
> index fb9584641ac7..540aa0ea67ff 100644
> --- a/mm/vmscan.c
> +++ b/mm/vmscan.c
> @@ -989,17 +989,6 @@ static inline int is_page_cache_freeable(struct page *page)
> return page_count(page) - page_has_private(page) == 1 + page_cache_pins;
> }
>
> -static int may_write_to_inode(struct inode *inode)
> -{
> - if (current->flags & PF_SWAPWRITE)
> - return 1;
> - if (!inode_write_congested(inode))
> - return 1;
> - if (inode_to_bdi(inode) == current->backing_dev_info)
> - return 1;
> - return 0;
> -}
Why is it safe to get rid of the PF_SWAPWRITE and current->backing_dev_info
checks?
> @@ -1158,8 +1147,6 @@ static pageout_t pageout(struct page *page, struct address_space *mapping)
> }
> if (mapping->a_ops->writepage == NULL)
> return PAGE_ACTIVATE;
> - if (!may_write_to_inode(mapping->host))
> - return PAGE_KEEP;
>
> if (clear_page_dirty_for_io(page)) {
> int res;
