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SubjectRe: [PATCH] mm/mmap.c: Remove useless statement "vma = NULL" in find_vma()
Hello all:

I also want to consult: the comments of find_vma() says:

"Look up the first VMA which satisfies addr < vm_end, ..."

Is it OK? (why not "vm_start <= addr < vm_end"), need we let "vma = tmp"
in "if (tmp->vm_start <= addr)"? -- it looks the comments is not match
the implementation, precisely (maybe not 1st VMA).


Thanks.


On 9/3/15 11:52, gang.chen.5i5j@gmail.com wrote:
> From: Chen Gang <gang.chen.5i5j@gmail.com>
>
> Before the main looping, vma is already is NULL, so need not set it to
> NULL, again.
>
> Signed-off-by: Chen Gang <gang.chen.5i5j@gmail.com>
> ---
> mm/mmap.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/mm/mmap.c b/mm/mmap.c
> index df6d5f0..4db7cf0 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2054,7 +2054,6 @@ struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
> return vma;
>
> rb_node = mm->mm_rb.rb_node;
> - vma = NULL;
>
> while (rb_node) {
> struct vm_area_struct *tmp;
>

--
Chen Gang (陈刚)

Open, share, and attitude like air, water, and life which God blessed


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