Re: [PATCH v2] remove no longer use of pdflush interface

[Boaz Harrosh <bharrosh@panasas.com>]

On 06/06/2012 10:31 AM, Boaz Harrosh wrote:

> On 06/06/2012 01:28 AM, Andrew Morton wrote:
> 
>> On Tue,  5 Jun 2012 17:26:11 +0800
>> Wanpeng Li <liwp.linux@gmail.com> wrote:
>>
>> So perhaps the solution is to give up on the generic proc_obsolete()
>> idea, and just add a handler specifically for nr_pdflush_threads, whcih
>> uses printk_once().
>>
> 
> 
> If there are many users than a self made print once is worth it
> we can use the ctl_table->data pointer for this, some thing like:
> 
> int nr_pdflush_was_printed;
> 
> @@ -1095,11 +1095,9 @@ static struct ctl_table vm_table[] = {
>  		.extra1		= &zero,
>  	},
>  	{
> -		.procname	= "nr_pdflush_threads",
> -		.data		= &nr_pdflush_threads,
> -		.maxlen		= sizeof nr_pdflush_threads,
> -		.mode		= 0444 /* read-only*/,
> -		.proc_handler	= proc_dointvec,
> +		.data		= &nr_pdflush_was_printed,
> +		.procname       = "nr_pdflush_threads",
> +		.mode           = 0444 /* read-only */,
> +		.proc_handler   = proc_obsolete,
>  	},
> 
> 
> +/* notice associated proc deprecated */
> +int proc_deprecated(struct ctl_table *table, int write,
> +		    void __user *buffer, size_t *lenp, loff_t *ppos, )
> +{
> +	if (*ctl_table->data) {


+	if(!*ctl_table->data) {

> +		printk(KERN_WARNING "%s exported in /proc is deprecated\n",
> +			table->procname);
> +		*ctl_table->data = 0;


+		*ctl_table->data = 1;

stupid me, time for coffee

Boaz

> +	}
> +	return -ENOSYS;
> +}