From: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx> Subject: mm: remove last argument of reuse_swap_page() None of the callers care about the total_map_swapcount() any more. Link: https://lkml.kernel.org/r/20211220205943.456187-1-willy@xxxxxxxxxxxxx Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> Acked-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/swap.h | 6 +++--- mm/huge_memory.c | 2 +- mm/khugepaged.c | 2 +- mm/memory.c | 2 +- mm/swapfile.c | 8 +------- 5 files changed, 7 insertions(+), 13 deletions(-) --- a/include/linux/swap.h~mm-remove-last-argument-of-reuse_swap_page +++ a/include/linux/swap.h @@ -514,7 +514,7 @@ extern int __swp_swapcount(swp_entry_t e extern int swp_swapcount(swp_entry_t entry); extern struct swap_info_struct *page_swap_info(struct page *); extern struct swap_info_struct *swp_swap_info(swp_entry_t entry); -extern bool reuse_swap_page(struct page *, int *); +extern bool reuse_swap_page(struct page *); extern int try_to_free_swap(struct page *); struct backing_dev_info; extern int init_swap_address_space(unsigned int type, unsigned long nr_pages); @@ -680,8 +680,8 @@ static inline int swp_swapcount(swp_entr return 0; } -#define reuse_swap_page(page, total_map_swapcount) \ - (page_trans_huge_mapcount(page, total_map_swapcount) == 1) +#define reuse_swap_page(page) \ + (page_trans_huge_mapcount(page, NULL) == 1) static inline int try_to_free_swap(struct page *page) { --- a/mm/huge_memory.c~mm-remove-last-argument-of-reuse_swap_page +++ a/mm/huge_memory.c @@ -1322,7 +1322,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm * We can only reuse the page if nobody else maps the huge page or it's * part. */ - if (reuse_swap_page(page, NULL)) { + if (reuse_swap_page(page)) { pmd_t entry; entry = pmd_mkyoung(orig_pmd); entry = maybe_pmd_mkwrite(pmd_mkdirty(entry), vma); --- a/mm/khugepaged.c~mm-remove-last-argument-of-reuse_swap_page +++ a/mm/khugepaged.c @@ -681,7 +681,7 @@ static int __collapse_huge_page_isolate( goto out; } if (!pte_write(pteval) && PageSwapCache(page) && - !reuse_swap_page(page, NULL)) { + !reuse_swap_page(page)) { /* * Page is in the swap cache and cannot be re-used. * It cannot be collapsed into a THP. --- a/mm/memory.c~mm-remove-last-argument-of-reuse_swap_page +++ a/mm/memory.c @@ -3627,7 +3627,7 @@ vm_fault_t do_swap_page(struct vm_fault inc_mm_counter_fast(vma->vm_mm, MM_ANONPAGES); dec_mm_counter_fast(vma->vm_mm, MM_SWAPENTS); pte = mk_pte(page, vma->vm_page_prot); - if ((vmf->flags & FAULT_FLAG_WRITE) && reuse_swap_page(page, NULL)) { + if ((vmf->flags & FAULT_FLAG_WRITE) && reuse_swap_page(page)) { pte = maybe_mkwrite(pte_mkdirty(pte), vma); vmf->flags &= ~FAULT_FLAG_WRITE; ret |= VM_FAULT_WRITE; --- a/mm/swapfile.c~mm-remove-last-argument-of-reuse_swap_page +++ a/mm/swapfile.c @@ -1668,12 +1668,8 @@ static int page_trans_huge_map_swapcount * to it. And as a side-effect, free up its swap: because the old content * on disk will never be read, and seeking back there to write new content * later would only waste time away from clustering. - * - * NOTE: total_map_swapcount should not be relied upon by the caller if - * reuse_swap_page() returns false, but it may be always overwritten - * (see the other implementation for CONFIG_SWAP=n). */ -bool reuse_swap_page(struct page *page, int *total_map_swapcount) +bool reuse_swap_page(struct page *page) { int count, total_mapcount, total_swapcount; @@ -1682,8 +1678,6 @@ bool reuse_swap_page(struct page *page, return false; count = page_trans_huge_map_swapcount(page, &total_mapcount, &total_swapcount); - if (total_map_swapcount) - *total_map_swapcount = total_mapcount + total_swapcount; if (count == 1 && PageSwapCache(page) && (likely(!PageTransCompound(page)) || /* The remaining swap count will be freed soon */ _
