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| author |   Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-21 14:48:45 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-07-21 14:48:45 -0700 |
| commit | 95faf6992df468f617edb788da8c21c6eed0dfa7 (patch) | |
| tree | 121683c4e94117b9e41d31b0bc359c01a05412ba /mm | |
| parent | mm: use helper functions for allocating and freeing vm_area structs (diff) | |
| download | linux-dev-95faf6992df468f617edb788da8c21c6eed0dfa7.tar.xz linux-dev-95faf6992df468f617edb788da8c21c6eed0dfa7.zip | |
mm: make vm_area_dup() actually copy the old vma data
.. and re-initialize th eanon_vma_chain head.
This removes some boiler-plate from the users, and also makes it clear
why it didn't need use the 'zalloc()' version.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmap.c | 7 | ||||
| -rw-r--r-- | mm/nommu.c | 1 |
2 files changed, 0 insertions, 8 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 4286ad2dd1f5..b0ed8ce1b67e 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2624,11 +2624,6 @@ int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, if (!new) return -ENOMEM; - /* most fields are the same, copy all, and then fixup */ - *new = *vma; - - INIT_LIST_HEAD(&new->anon_vma_chain); - if (new_below) new->vm_end = addr; else { @@ -3205,13 +3200,11 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, new_vma = vm_area_dup(vma); if (!new_vma) goto out; - *new_vma = *vma; new_vma->vm_start = addr; new_vma->vm_end = addr + len; new_vma->vm_pgoff = pgoff; if (vma_dup_policy(vma, new_vma)) goto out_free_vma; - INIT_LIST_HEAD(&new_vma->anon_vma_chain); if (anon_vma_clone(new_vma, vma)) goto out_free_mempol; if (new_vma->vm_file) diff --git a/mm/nommu.c b/mm/nommu.c index 006e3fe65017..c2560e9cc803 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1476,7 +1476,6 @@ int split_vma(struct mm_struct *mm, struct vm_area_struct *vma, } /* most fields are the same, copy all, and then fixup */ - *new = *vma; *region = *vma->vm_region; new->vm_region = region; |