linux-kernel - Re: [PATCH 2/5] mm/vmalloc.c: simplify /proc/vmallocinfo implementation

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Date:   Wed, 21 Sep 2016 14:16:02 -0700 (PDT)
From:   David Rientjes <rientjes@...gle.com>
To:     zijun_hu <zijun_hu@...o.com>
cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, zijun_hu@....com, tj@...nel.org,
        mingo@...nel.org, iamjoonsoo.kim@....com,
        mgorman@...hsingularity.net
Subject: Re: [PATCH 2/5] mm/vmalloc.c: simplify /proc/vmallocinfo
 implementation

On Wed, 21 Sep 2016, zijun_hu wrote:

> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index cc6ecd6..a125ae8 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2576,32 +2576,13 @@ void pcpu_free_vm_areas(struct vm_struct **vms, int nr_vms)
>  static void *s_start(struct seq_file *m, loff_t *pos)
>  	__acquires(&vmap_area_lock)
>  {
> -	loff_t n = *pos;
> -	struct vmap_area *va;
> -
>  	spin_lock(&vmap_area_lock);
> -	va = list_first_entry(&vmap_area_list, typeof(*va), list);
> -	while (n > 0 && &va->list != &vmap_area_list) {
> -		n--;
> -		va = list_next_entry(va, list);
> -	}
> -	if (!n && &va->list != &vmap_area_list)
> -		return va;
> -
> -	return NULL;
> -
> +	return seq_list_start(&vmap_area_list, *pos);
>  }
>  
>  static void *s_next(struct seq_file *m, void *p, loff_t *pos)
>  {
> -	struct vmap_area *va = p, *next;
> -
> -	++*pos;
> -	next = list_next_entry(va, list);
> -	if (&next->list != &vmap_area_list)
> -		return next;
> -
> -	return NULL;
> +	return seq_list_next(p, &vmap_area_list, pos);
>  }
>  
>  static void s_stop(struct seq_file *m, void *p)
> @@ -2636,9 +2617,11 @@ static void show_numa_info(struct seq_file *m, struct vm_struct *v)
>  
>  static int s_show(struct seq_file *m, void *p)
>  {
> -	struct vmap_area *va = p;
> +	struct vmap_area *va;
>  	struct vm_struct *v;
>  
> +	va = list_entry((struct list_head *)p, struct vmap_area, list);

Looks good other than no cast is neccessary above.

The patches in this series seem to be unrelated to each other, they 
shouldn't be numbered in order since there's no dependence.  Just 
individual patches are fine.