diff options
| author | Ralph Campbell <[email protected]> | 2020-09-04 16:36:07 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2020-09-05 12:14:30 -0700 |
| commit | 3d321bf82c4be8e33261754a5775bc65fc5d2184 (patch) | |
| tree | 3bdbeab29ba333e59314ff6587af7ba341669247 | |
| parent | 6128763fc3244d1b4868e5f0aa401f7f987b5c4d (diff) | |
mm/migrate: preserve soft dirty in remove_migration_pte()
The code to remove a migration PTE and replace it with a device private
PTE was not copying the soft dirty bit from the migration entry. This
could lead to page contents not being marked dirty when faulting the page
back from device private memory.
Signed-off-by: Ralph Campbell <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Reviewed-by: Christoph Hellwig <[email protected]>
Cc: Jerome Glisse <[email protected]>
Cc: Alistair Popple <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Jason Gunthorpe <[email protected]>
Cc: Bharata B Rao <[email protected]>
Link: https://lkml.kernel.org/r/[email protected]
Signed-off-by: Linus Torvalds <[email protected]>
| -rw-r--r-- | mm/migrate.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 1d791d420725..941b89383cf3 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -249,6 +249,8 @@ static bool remove_migration_pte(struct page *page, struct vm_area_struct *vma, if (unlikely(is_device_private_page(new))) { entry = make_device_private_entry(new, pte_write(pte)); pte = swp_entry_to_pte(entry); + if (pte_swp_soft_dirty(*pvmw.pte)) + pte = pte_swp_mksoft_dirty(pte); if (pte_swp_uffd_wp(*pvmw.pte)) pte = pte_swp_mkuffd_wp(pte); } |