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

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Date:   Thu, 22 Sep 2016 07:22:33 +0800
From:   zijun_hu <zijun_hu@...o.com>
To:     David Rientjes <rientjes@...gle.com>
Cc:     zijun_hu@....com, Andrew Morton <akpm@...ux-foundation.org>,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org, 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 2016/9/22 5:16, David Rientjes wrote:
> 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.
  you are right, it will correct it
  i refer to show_timer()@fs/proc/base.c plainly and ignore that redundant cast
> 
> 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.
> 
you are right, i will provide a individual patch finnally