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| author | Alistair Popple <apopple@nvidia.com> | 2021-06-30 18:54:09 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2021-07-01 11:06:03 -0700 |
| commit | 4dd845b5a3e57ad07f26ef808707b064696fe34b (patch) | |
| tree | 6cfe529d45b92923ff4cf7e90762a770822dc691 /mm/memory.c | |
| parent | af5cdaf82238fb3637a0d0fff4670e5be71c611c (diff) | |
| download | lwn-4dd845b5a3e57ad07f26ef808707b064696fe34b.tar.gz lwn-4dd845b5a3e57ad07f26ef808707b064696fe34b.zip | |
mm/swapops: rework swap entry manipulation code
Both migration and device private pages use special swap entries that are
manipluated by a range of inline functions. The arguments to these are
somewhat inconsistent so rework them to remove flag type arguments and to
make the arguments similar for both read and write entry creation.
Link: https://lkml.kernel.org/r/20210616105937.23201-3-apopple@nvidia.com
Signed-off-by: Alistair Popple <apopple@nvidia.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Ralph Campbell <rcampbell@nvidia.com>
Cc: Ben Skeggs <bskeggs@redhat.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: John Hubbard <jhubbard@nvidia.com>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>
Cc: Peter Xu <peterx@redhat.com>
Cc: Shakeel Butt <shakeelb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory.c')
| -rw-r--r-- | mm/memory.c | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/mm/memory.c b/mm/memory.c index 6723931085c7..e30488e9202f 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -733,13 +733,14 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, rss[mm_counter(page)]++; - if (is_write_migration_entry(entry) && + if (is_writable_migration_entry(entry) && is_cow_mapping(vm_flags)) { /* * COW mappings require pages in both * parent and child to be set to read. */ - make_migration_entry_read(&entry); + entry = make_readable_migration_entry( + swp_offset(entry)); pte = swp_entry_to_pte(entry); if (pte_swp_soft_dirty(*src_pte)) pte = pte_swp_mksoft_dirty(pte); @@ -770,9 +771,10 @@ copy_nonpresent_pte(struct mm_struct *dst_mm, struct mm_struct *src_mm, * when a device driver is involved (you cannot easily * save and restore device driver state). */ - if (is_write_device_private_entry(entry) && + if (is_writable_device_private_entry(entry) && is_cow_mapping(vm_flags)) { - make_device_private_entry_read(&entry); + entry = make_readable_device_private_entry( + swp_offset(entry)); pte = swp_entry_to_pte(entry); if (pte_swp_uffd_wp(*src_pte)) pte = pte_swp_mkuffd_wp(pte); |