From: Peter Xu <peterx@xxxxxxxxxx> Subject: mm: rename zap_skip_check_mapping() to should_zap_page() The previous name is against the natural way people think. Invert the meaning and also the return value. No functional change intended. Link: https://lkml.kernel.org/r/20220216094810.60572-3-peterx@xxxxxxxxxx Signed-off-by: Peter Xu <peterx@xxxxxxxxxx> Suggested-by: David Hildenbrand <david@xxxxxxxxxx> Suggested-by: Hugh Dickins <hughd@xxxxxxxxxx> Reviewed-by: David Hildenbrand <david@xxxxxxxxxx> Reviewed-by: John Hubbard <jhubbard@xxxxxxxxxx> Cc: Alistair Popple <apopple@xxxxxxxxxx> Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx> Cc: "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx> Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx> Cc: Vlastimil Babka <vbabka@xxxxxxx> Cc: Yang Shi <shy828301@xxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/memory.c | 17 ++++++++--------- 1 file changed, 8 insertions(+), 9 deletions(-) --- a/mm/memory.c~mm-rename-zap_skip_check_mapping-to-should_zap_page +++ a/mm/memory.c @@ -1326,20 +1326,19 @@ static inline bool should_zap_cows(struc /* * We set details->zap_mapping when we want to unmap shared but keep private - * pages. Return true if skip zapping this page, false otherwise. + * pages. Return true if we should zap this page, false otherwise. */ -static inline bool -zap_skip_check_mapping(struct zap_details *details, struct page *page) +static inline bool should_zap_page(struct zap_details *details, struct page *page) { /* If we can make a decision without *page.. */ if (should_zap_cows(details)) - return false; + return true; /* E.g. the caller passes NULL for the case of a zero page */ if (!page) - return false; + return true; - return details->zap_mapping != page_rmapping(page); + return details->zap_mapping == page_rmapping(page); } static unsigned long zap_pte_range(struct mmu_gather *tlb, @@ -1374,7 +1373,7 @@ again: struct page *page; page = vm_normal_page(vma, addr, ptent); - if (unlikely(zap_skip_check_mapping(details, page))) + if (unlikely(!should_zap_page(details, page))) continue; ptent = ptep_get_and_clear_full(mm, addr, pte, tlb->fullmm); @@ -1408,7 +1407,7 @@ again: is_device_exclusive_entry(entry)) { struct page *page = pfn_swap_entry_to_page(entry); - if (unlikely(zap_skip_check_mapping(details, page))) + if (unlikely(!should_zap_page(details, page))) continue; pte_clear_not_present_full(mm, addr, pte, tlb->fullmm); rss[mm_counter(page)]--; @@ -1429,7 +1428,7 @@ again: struct page *page; page = pfn_swap_entry_to_page(entry); - if (zap_skip_check_mapping(details, page)) + if (!should_zap_page(details, page)) continue; rss[mm_counter(page)]--; } else if (is_hwpoison_entry(entry)) { _
