Re: [PATCH] mm/mmap.c: silence variable 'new_start' set but not used

[Qian Cai <cai@lca.pw>]

On Wed, 2019-07-24 at 22:07 +0800, YueHaibing wrote:
> 'new_start' is used in is_hugepage_only_range(),
> which do nothing in some arch. gcc will warning:
> 
> mm/mmap.c: In function acct_stack_growth:
> mm/mmap.c:2311:16: warning: variable new_start set but not used [-Wunused-but-
> set-variable]

Nope. Convert them to inline instead.

> 
> Reported-by: Hulk Robot <hulkci@huawei.com>
> Signed-off-by: YueHaibing <yuehaibing@huawei.com>
> ---
>  mm/mmap.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/mm/mmap.c b/mm/mmap.c
> index e2dbed3..56c2a92 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2308,7 +2308,7 @@ static int acct_stack_growth(struct vm_area_struct *vma,
>  			     unsigned long size, unsigned long grow)
>  {
>  	struct mm_struct *mm = vma->vm_mm;
> -	unsigned long new_start;
> +	unsigned long __maybe_unused new_start;
>  
>  	/* address space limit tests */
>  	if (!may_expand_vm(mm, vma->vm_flags, grow))