diff options
| author | Liam R. Howlett <Liam.Howlett@oracle.com> | 2023-06-16 15:58:54 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-06-24 14:13:54 -0700 |
| commit | f440fa1ac955e2898893f9301568435eb5cdfc4b (patch) | |
| tree | 5acff3435c93fdcb5527124ae4aadfcbd46ab866 /mm/nommu.c | |
| parent | 2cd76c50d0b41cec5c87abfcdf25b236a2793fb6 (diff) | |
mm: make find_extend_vma() fail if write lock not held
Make calls to extend_vma() and find_extend_vma() fail if the write lock
is required.
To avoid making this a flag-day event, this still allows the old
read-locking case for the trivial situations, and passes in a flag to
say "is it write-locked". That way write-lockers can say "yes, I'm
being careful", and legacy users will continue to work in all the common
cases until they have been fully converted to the new world order.
Co-Developed-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index f670d9979a26..f476c9ed36b3 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -643,7 +643,8 @@ struct vm_area_struct *find_extend_vma(struct mm_struct *mm, unsigned long addr) * expand a stack to a given address * - not supported under NOMMU conditions */ -int expand_stack(struct vm_area_struct *vma, unsigned long address) +int expand_stack_locked(struct vm_area_struct *vma, unsigned long address, + bool write_locked) { return -ENOMEM; } |