linux-kernel - Re: [PATCH R2 1/7] mm: Add add_registered

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Date:	Wed, 29 Dec 2010 16:50:25 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Daniel Kiper <dkiper@...-space.pl>
cc:	ian.campbell@...rix.com, Andrew Morton <akpm@...ux-foundation.org>,
	Andi Kleen <andi.kleen@...el.com>, haicheng.li@...ux.intel.com,
	fengguang.wu@...el.com, jeremy@...p.org, konrad.wilk@...cle.com,
	dan.magenheimer@...cle.com, v.tolstov@...fip.ru,
	xen-devel@...ts.xensource.com, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH R2 1/7] mm: Add add_registered_memory() to memory hotplug
 API

On Wed, 29 Dec 2010, Daniel Kiper wrote:

> diff --git a/include/linux/memory_hotplug.h b/include/linux/memory_hotplug.h
> index 864035f..2458b2f 100644
> --- a/include/linux/memory_hotplug.h
> +++ b/include/linux/memory_hotplug.h
> @@ -203,6 +203,7 @@ static inline int is_mem_section_removable(unsigned long pfn,
>  #endif /* CONFIG_MEMORY_HOTREMOVE */
>  
>  extern int mem_online_node(int nid);
> +extern int add_registered_memory(int nid, u64 start, u64 size);
>  extern int add_memory(int nid, u64 start, u64 size);
>  extern int arch_add_memory(int nid, u64 start, u64 size);
>  extern int remove_memory(u64 start, u64 size);
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index dd186c1..b642f26 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -509,20 +509,12 @@ out:
>  }
>  
>  /* we are OK calling __meminit stuff here - we have CONFIG_MEMORY_HOTPLUG */
> -int __ref add_memory(int nid, u64 start, u64 size)
> +static int __ref __add_memory(int nid, u64 start, u64 size)
>  {
>  	pg_data_t *pgdat = NULL;
>  	int new_pgdat = 0;
> -	struct resource *res;
>  	int ret;
>  
> -	lock_system_sleep();
> -
> -	res = register_memory_resource(start, size);
> -	ret = -EEXIST;
> -	if (!res)
> -		goto out;
> -
>  	if (!node_online(nid)) {
>  		pgdat = hotadd_new_pgdat(nid, start);
>  		ret = -ENOMEM;

Looks like this patch was based on a kernel before 2.6.37-rc4 since it 
doesn't have 20d6c96b5f (mem-hotplug: introduce {un}lock_memory_hotplug()) 

> @@ -556,14 +548,48 @@ int __ref add_memory(int nid, u64 start, u64 size)
>  	goto out;
>  
>  error:
> -	/* rollback pgdat allocation and others */
> +	/* rollback pgdat allocation */
>  	if (new_pgdat)
>  		rollback_node_hotadd(nid, pgdat);
> -	if (res)
> -		release_memory_resource(res);
> +
> +out:
> +	return ret;
> +}
> +
> +int add_registered_memory(int nid, u64 start, u64 size)
> +{
> +	int ret;
> +
> +	lock_system_sleep();
> +	ret = __add_memory(nid, start, size);
> +	unlock_system_sleep();
> +
> +	return ret;
> +}
> +EXPORT_SYMBOL_GPL(add_registered_memory);
> +
> +int add_memory(int nid, u64 start, u64 size)
> +{
> +	int ret = -EEXIST;
> +	struct resource *res;
> +
> +	lock_system_sleep();
> +
> +	res = register_memory_resource(start, size);
> +
> +	if (!res)
> +		goto out;
> +
> +	ret = __add_memory(nid, start, size);
> +
> +	if (!ret)
> +		goto out;
> +
> +	release_memory_resource(res);
>  
>  out:
>  	unlock_system_sleep();
> +
>  	return ret;
>  }
>  EXPORT_SYMBOL_GPL(add_memory);

Lots of unnecessary empty lines here, and scripts/checkpatch.pl says there 
are trailing whitespaces as well.
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