diff options
| author | Liam R. Howlett <Liam.Howlett@oracle.com> | 2023-06-17 01:58:54 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2023-06-25 00:13:54 +0300 |
| commit | f440fa1ac955e2898893f9301568435eb5cdfc4b (patch) | |
| tree | 5acff3435c93fdcb5527124ae4aadfcbd46ab866 /include | |
| parent | 2cd76c50d0b41cec5c87abfcdf25b236a2793fb6 (diff) | |
| download | linux-f440fa1ac955e2898893f9301568435eb5cdfc4b.tar.xz | |
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 'include')
| -rw-r--r-- | include/linux/mm.h | 10 |
1 files changed, 7 insertions, 3 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index 570cf906fbcc..01a016521b60 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3192,11 +3192,13 @@ extern vm_fault_t filemap_page_mkwrite(struct vm_fault *vmf); extern unsigned long stack_guard_gap; /* Generic expand stack which grows the stack according to GROWS{UP,DOWN} */ -extern 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); +#define expand_stack(vma,addr) expand_stack_locked(vma,addr,false) /* CONFIG_STACK_GROWSUP still needs to grow downwards at some places */ -extern int expand_downwards(struct vm_area_struct *vma, - unsigned long address); +int expand_downwards(struct vm_area_struct *vma, unsigned long address, + bool write_locked); #if VM_GROWSUP extern int expand_upwards(struct vm_area_struct *vma, unsigned long address); #else @@ -3297,6 +3299,8 @@ unsigned long change_prot_numa(struct vm_area_struct *vma, #endif struct vm_area_struct *find_extend_vma(struct mm_struct *, unsigned long addr); +struct vm_area_struct *find_extend_vma_locked(struct mm_struct *, + unsigned long addr, bool write_locked); int remap_pfn_range(struct vm_area_struct *, unsigned long addr, unsigned long pfn, unsigned long size, pgprot_t); int remap_pfn_range_notrack(struct vm_area_struct *vma, unsigned long addr, |