[patch 3/4] mm/thp: fix call to mmu_notifier in set_pmd_migration_entry() v2

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From: Jérôme Glisse <jglisse@xxxxxxxxxx>
Subject: mm/thp: fix call to mmu_notifier in set_pmd_migration_entry() v2

Inside set_pmd_migration_entry() we are holding page table locks and thus
we can not sleep so we can not call invalidate_range_start/end()

So remove call to mmu_notifier_invalidate_range_start/end() because they
are call inside the function calling set_pmd_migration_entry() (see
try_to_unmap_one()).

Link: http://lkml.kernel.org/r/20181012181056.7864-1-jglisse@xxxxxxxxxx
Signed-off-by: Jérôme Glisse <jglisse@xxxxxxxxxx>
Reported-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Reviewed-by: Zi Yan <zi.yan@xxxxxxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Cc: "H. Peter Anvin" <hpa@xxxxxxxxx>
Cc: Anshuman Khandual <khandual@xxxxxxxxxxxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxx>
Cc: David Nellans <dnellans@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---


--- a/mm/huge_memory.c~mm-thp-fix-call-to-mmu_notifier-in-set_pmd_migration_entry-v2
+++ a/mm/huge_memory.c
@@ -2885,9 +2885,6 @@ void set_pmd_migration_entry(struct page
 	if (!(pvmw->pmd && !pvmw->pte))
 		return;
 
-	mmu_notifier_invalidate_range_start(mm, address,
-			address + HPAGE_PMD_SIZE);
-
 	flush_cache_range(vma, address, address + HPAGE_PMD_SIZE);
 	pmdval = *pvmw->pmd;
 	pmdp_invalidate(vma, address, pvmw->pmd);
@@ -2900,9 +2897,6 @@ void set_pmd_migration_entry(struct page
 	set_pmd_at(mm, address, pvmw->pmd, pmdswp);
 	page_remove_rmap(page, true);
 	put_page(page);
-
-	mmu_notifier_invalidate_range_end(mm, address,
-			address + HPAGE_PMD_SIZE);
 }
 
 void remove_migration_pmd(struct page_vma_mapped_walk *pvmw, struct page *new)
_



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