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| author | Chen Gang <gang.chen.5i5j@gmail.com> | 2015-09-08 15:03:38 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-09-08 15:35:28 -0700 |
| commit | e3975891254e08d220ddcafca93a0e05d9560bfb (patch) | |
| tree | 6c6cbc9bac8c02e8df289acf25871a569659b5bd /mm/mmap.c | |
| parent | 44a30220bc0a171c010e8df63d144655abdafe61 (diff) | |
| download | linux-e3975891254e08d220ddcafca93a0e05d9560bfb.tar.bz2 | |
mm/mmap.c: simplify the failure return working flow
__split_vma() doesn't need out_err label, neither need initializing err.
copy_vma() can return NULL directly when kmem_cache_alloc() fails.
Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/mmap.c')
| -rw-r--r-- | mm/mmap.c | 44 |
1 files changed, 22 insertions, 22 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 52a2373d0ed4..7a3b12399f06 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2455,7 +2455,7 @@ static int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, unsigned long addr, int new_below) { struct vm_area_struct *new; - int err = -ENOMEM; + int err; if (is_vm_hugetlb_page(vma) && (addr & ~(huge_page_mask(hstate_vma(vma))))) @@ -2463,7 +2463,7 @@ static int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, new = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); if (!new) - goto out_err; + return -ENOMEM; /* most fields are the same, copy all, and then fixup */ *new = *vma; @@ -2511,7 +2511,6 @@ static int __split_vma(struct mm_struct *mm, struct vm_area_struct *vma, mpol_put(vma_policy(new)); out_free_vma: kmem_cache_free(vm_area_cachep, new); - out_err: return err; } @@ -2952,30 +2951,31 @@ struct vm_area_struct *copy_vma(struct vm_area_struct **vmap, *need_rmap_locks = (new_vma->vm_pgoff <= vma->vm_pgoff); } else { new_vma = kmem_cache_alloc(vm_area_cachep, GFP_KERNEL); - if (new_vma) { - *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) - get_file(new_vma->vm_file); - if (new_vma->vm_ops && new_vma->vm_ops->open) - new_vma->vm_ops->open(new_vma); - vma_link(mm, new_vma, prev, rb_link, rb_parent); - *need_rmap_locks = false; - } + 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) + get_file(new_vma->vm_file); + if (new_vma->vm_ops && new_vma->vm_ops->open) + new_vma->vm_ops->open(new_vma); + vma_link(mm, new_vma, prev, rb_link, rb_parent); + *need_rmap_locks = false; } return new_vma; - out_free_mempol: +out_free_mempol: mpol_put(vma_policy(new_vma)); - out_free_vma: +out_free_vma: kmem_cache_free(vm_area_cachep, new_vma); +out: return NULL; } |