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| author | Miaohe Lin <linmiaohe@huawei.com> | 2020-01-30 22:14:51 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2020-01-31 10:30:39 -0800 |
| commit | a67c8caae98f165d4b2caf73a5b32343524bc037 (patch) | |
| tree | f22e4bc62dd5a3ab9a2bb0918065fd50cd5f5d48 /mm/mmap.c | |
| parent | f42f25526502d851d0e3ca1e46297da8aafce8a7 (diff) | |
| download | linux-a67c8caae98f165d4b2caf73a5b32343524bc037.tar.bz2 | |
mm/mmap.c: get rid of odd jump labels in find_mergeable_anon_vma()
The jump labels try_prev and none are not really needed in
find_mergeable_anon_vma(), eliminate them to improve readability.
Link: http://lkml.kernel.org/r/1574079844-17493-1-git-send-email-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Reviewed-by: John Hubbard <jhubbard@nvidia.com>
Reviewed-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: David Rientjes <rientjes@google.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 | 36 |
1 files changed, 16 insertions, 20 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index bc788548c4e5..6756b8bb0033 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1270,26 +1270,22 @@ static struct anon_vma *reusable_anon_vma(struct vm_area_struct *old, struct vm_ */ struct anon_vma *find_mergeable_anon_vma(struct vm_area_struct *vma) { - struct anon_vma *anon_vma; - struct vm_area_struct *near; - - near = vma->vm_next; - if (!near) - goto try_prev; - - anon_vma = reusable_anon_vma(near, vma, near); - if (anon_vma) - return anon_vma; -try_prev: - near = vma->vm_prev; - if (!near) - goto none; - - anon_vma = reusable_anon_vma(near, near, vma); - if (anon_vma) - return anon_vma; -none: + struct anon_vma *anon_vma = NULL; + + /* Try next first. */ + if (vma->vm_next) { + anon_vma = reusable_anon_vma(vma->vm_next, vma, vma->vm_next); + if (anon_vma) + return anon_vma; + } + + /* Try prev next. */ + if (vma->vm_prev) + anon_vma = reusable_anon_vma(vma->vm_prev, vma->vm_prev, vma); + /* + * We might reach here with anon_vma == NULL if we can't find + * any reusable anon_vma. * There's no absolute need to look only at touching neighbours: * we could search further afield for "compatible" anon_vmas. * But it would probably just be a waste of time searching, @@ -1297,7 +1293,7 @@ none: * We're trying to allow mprotect remerging later on, * not trying to minimize memory used for anon_vmas. */ - return NULL; + return anon_vma; } /* |