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| author | Wei Yang <richardw.yang@linux.intel.com> | 2019-09-23 15:39:25 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-09-24 15:54:12 -0700 |
| commit | 73848a9711105836346462e1d3c6b5765b452de1 (patch) | |
| tree | 1b564f7f54f5990bdbe3e84ebcf1324a9915e9d6 /mm | |
| parent | 54c95a11cc1b5e1d578209e027adf5775395dafd (diff) | |
| download | linux-73848a9711105836346462e1d3c6b5765b452de1.tar.bz2 | |
mm/mmap.c: refine find_vma_prev() with rb_last()
When addr is out of range of the whole rb_tree, pprev will point to the
right-most node. rb_tree facility already provides a helper function,
rb_last(), to do this task. We can leverage this instead of
reimplementing it.
This patch refines find_vma_prev() with rb_last() to make it a little
nicer to read.
[akpm@linux-foundation.org: little cleanup, per Vlastimil]
Link: http://lkml.kernel.org/r/20190809001928.4950-1-richardw.yang@linux.intel.com
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/mmap.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/mm/mmap.c b/mm/mmap.c index 6bc21fca20bc..e4a8f67aad62 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2274,12 +2274,9 @@ find_vma_prev(struct mm_struct *mm, unsigned long addr, if (vma) { *pprev = vma->vm_prev; } else { - struct rb_node *rb_node = mm->mm_rb.rb_node; - *pprev = NULL; - while (rb_node) { - *pprev = rb_entry(rb_node, struct vm_area_struct, vm_rb); - rb_node = rb_node->rb_right; - } + struct rb_node *rb_node = rb_last(&mm->mm_rb); + + *pprev = rb_node ? rb_entry(rb_node, struct vm_area_struct, vm_rb) : NULL; } return vma; } |