The patch titled
Subject: mm: thp: relocate flush_cache_range() in migrate_misplaced_transhuge_page()
has been removed from the -mm tree. Its filename was
mm-thp-relocate-flush_cache_range-in-migrate_misplaced_transhuge_page.patch
This patch was dropped because an alternative patch was merged
------------------------------------------------------
From: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Subject: mm: thp: relocate flush_cache_range() in migrate_misplaced_transhuge_page()
There should be no cache left by the time we overwrite the old transhuge
pmd with the new one. It's already too late to flush through the virtual
address because we already copied the page data to the new physical
address.
So flush the cache before the data copy.
Link: http://lkml.kernel.org/r/20181015202311.7209-1-aarcange@xxxxxxxxxx
Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
Cc: Aaron Tomlin <atomlin@xxxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxx>
Cc: Jerome Glisse <jglisse@xxxxxxxxxx>
Cc: "Kirill A. Shutemov" <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/migrate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
--- a/mm/migrate.c~mm-thp-relocate-flush_cache_range-in-migrate_misplaced_transhuge_page
+++ a/mm/migrate.c
@@ -1999,6 +1999,8 @@ int migrate_misplaced_transhuge_page(str
/* anon mapping, we can simply copy page->mapping to the new page: */
new_page->mapping = page->mapping;
new_page->index = page->index;
+ /* flush the cache before copying using the kernel virtual address */
+ flush_cache_range(vma, mmun_start, mmun_end);
migrate_page_copy(new_page, page);
WARN_ON(PageLRU(new_page));
@@ -2037,7 +2039,6 @@ int migrate_misplaced_transhuge_page(str
* The SetPageUptodate on the new page and page_add_new_anon_rmap
* guarantee the copy is visible before the pagetable update.
*/
- flush_cache_range(vma, mmun_start, mmun_end);
page_add_anon_rmap(new_page, vma, mmun_start, true);
pmdp_huge_clear_flush_notify(vma, mmun_start, pmd);
set_pmd_at(mm, mmun_start, pmd, entry);
_
Patches currently in -mm which might be from aarcange@xxxxxxxxxx are
mm-thp-relax-__gfp_thisnode-for-madv_hugepage-mappings.patch
userfaultfd-allow-get_mempolicympol_f_nodempol_f_addr-to-trigger-userfaults.patch
