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mprotect: use pfn_swap_entry_folio 

We only want to know whether the folio is anonymous, so use
pfn_swap_entry_folio() and save a call to compound_head().

Link: https://lkml.kernel.org/r/20240111152429.3374566-4-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Cc: David Hildenbrand <david@redhat.com>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2024-01-11 15:24:22 +00:00 committed by Andrew Morton
parent 7101422464
commit f2d571b0b2
1 changed files with 2 additions and 2 deletions
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4
mm/mprotect.c
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@ -198,13 +198,13 @@ static long change_pte_range(struct mmu_gather *tlb,
pte_t newpte;
if (is_writable_migration_entry(entry)) {
struct page *page = pfn_swap_entry_to_page(entry);
struct folio *folio = pfn_swap_entry_folio(entry);
/*
* A protection check is difficult so
* just be safe and disable write
*/
if (PageAnon(page))
if (folio_test_anon(folio))
entry = make_readable_exclusive_migration_entry(
swp_offset(entry));
else