+ mm-rework-swap-handling-of-zap_pte_range.patch added to -mm tree

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The patch titled
     Subject: mm: rework swap handling of zap_pte_range
has been added to the -mm tree.  Its filename is
     mm-rework-swap-handling-of-zap_pte_range.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-rework-swap-handling-of-zap_pte_range.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-rework-swap-handling-of-zap_pte_range.patch

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------------------------------------------------------
From: Peter Xu <peterx@xxxxxxxxxx>
Subject: mm: rework swap handling of zap_pte_range

Clean the code up by merging the device private/exclusive swap entry
handling with the rest, then we merge the pte clear operation too.

struct* page is defined in multiple places in the function, move it upward.

free_swap_and_cache() is only useful for !non_swap_entry() case, put it
into the condition.

No functional change intended.

Link: https://lkml.kernel.org/r/20220216094810.60572-5-peterx@xxxxxxxxxx
Signed-off-by: Peter Xu <peterx@xxxxxxxxxx>
Cc: David Hildenbrand <david@xxxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: "Kirill A . Shutemov" <kirill@xxxxxxxxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Yang Shi <shy828301@xxxxxxxxx>
Cc: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: John Hubbard <jhubbard@xxxxxxxxxx>
Cc: Alistair Popple <apopple@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 mm/memory.c |   21 ++++++---------------
 1 file changed, 6 insertions(+), 15 deletions(-)

--- a/mm/memory.c~mm-rework-swap-handling-of-zap_pte_range
+++ a/mm/memory.c
@@ -1361,6 +1361,8 @@ again:
 	arch_enter_lazy_mmu_mode();
 	do {
 		pte_t ptent = *pte;
+		struct page *page;
+
 		if (pte_none(ptent))
 			continue;
 
@@ -1368,8 +1370,6 @@ again:
 			break;
 
 		if (pte_present(ptent)) {
-			struct page *page;
-
 			page = vm_normal_page(vma, addr, ptent);
 			if (unlikely(!should_zap_page(details, page)))
 				continue;
@@ -1403,21 +1403,14 @@ again:
 		entry = pte_to_swp_entry(ptent);
 		if (is_device_private_entry(entry) ||
 		    is_device_exclusive_entry(entry)) {
-			struct page *page = pfn_swap_entry_to_page(entry);
-
+			page = pfn_swap_entry_to_page(entry);
 			if (unlikely(!should_zap_page(details, page)))
 				continue;
-			pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
 			rss[mm_counter(page)]--;
-
 			if (is_device_private_entry(entry))
 				page_remove_rmap(page, false);
-
 			put_page(page);
-			continue;
-		}
-
-		if (!non_swap_entry(entry)) {
+		} else if (!non_swap_entry(entry)) {
 			/*
 			 * If this is a genuine swap entry, then it must be an
 			 * private anon page.  If the caller wants to skip
@@ -1426,9 +1419,9 @@ again:
 			if (!should_zap_cows(details))
 				continue;
 			rss[MM_SWAPENTS]--;
+			if (unlikely(!free_swap_and_cache(entry)))
+				print_bad_pte(vma, addr, ptent, NULL);
 		} else if (is_migration_entry(entry)) {
-			struct page *page;
-
 			page = pfn_swap_entry_to_page(entry);
 			if (!should_zap_page(details, page))
 				continue;
@@ -1441,8 +1434,6 @@ again:
 			/* We should have covered all the swap entry types */
 			WARN_ON_ONCE(1);
 		}
-		if (unlikely(!free_swap_and_cache(entry)))
-			print_bad_pte(vma, addr, ptent, NULL);
 		pte_clear_not_present_full(mm, addr, pte, tlb->fullmm);
 	} while (pte++, addr += PAGE_SIZE, addr != end);
 
_

Patches currently in -mm which might be from peterx@xxxxxxxxxx are

mm-fix-invalid-page-pointer-returned-with-foll_pin-gups.patch
mm-dont-skip-swap-entry-even-if-zap_details-specified.patch
mm-rename-zap_skip_check_mapping-to-should_zap_page.patch
mm-change-zap_detailszap_mapping-into-even_cows.patch
mm-rework-swap-handling-of-zap_pte_range.patch




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