Re: [RFC v3 PATCH 3/5] mm: refactor do_munmap() to extract the common part

[Michal Hocko]

On Sat 30-06-18 06:39:43, Yang Shi wrote:
> Introduces two new helper functions:
>   * munmap_addr_sanity()
>   * munmap_lookup_vma()
> 
> They will be used by do_munmap() and the new do_munmap with zapping
> large mapping early in the later patch.
> 
> There is no functional change, just code refactor.

There are whitespace changes which make the code much harder to review
than necessary.
> +static inline bool munmap_addr_sanity(unsigned long start, size_t len)
>  {
> -	unsigned long end;
> -	struct vm_area_struct *vma, *prev, *last;
> +	if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE - start)
> +		return false;
>  
> -	if ((offset_in_page(start)) || start > TASK_SIZE || len > TASK_SIZE-start)
> -		return -EINVAL;

e.g. here.
-- 
Michal Hocko
SUSE Labs