linux-kernel - Re: [PATCH v3 05/11] drivers/base/memory: Pass a block_id to init_memory

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Message-ID: <20190701075615.GE6376@dhcp22.suse.cz>
Date:   Mon, 1 Jul 2019 09:56:15 +0200
From:   Michal Hocko <mhocko@...nel.org>
To:     David Hildenbrand <david@...hat.com>
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-ia64@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-s390@...r.kernel.org, linux-sh@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, akpm@...ux-foundation.org,
        Dan Williams <dan.j.williams@...el.com>,
        Wei Yang <richard.weiyang@...il.com>,
        Igor Mammedov <imammedo@...hat.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: [PATCH v3 05/11] drivers/base/memory: Pass a block_id to
 init_memory_block()

On Mon 27-05-19 13:11:46, David Hildenbrand wrote:
> We'll rework hotplug_memory_register() shortly, so it no longer consumes
> pass a section.
> 
> Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Cc: "Rafael J. Wysocki" <rafael@...nel.org>
> Signed-off-by: David Hildenbrand <david@...hat.com>

Acked-by: Michal Hocko <mhocko@...e.com>

> ---
>  drivers/base/memory.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/base/memory.c b/drivers/base/memory.c
> index f180427e48f4..f914fa6fe350 100644
> --- a/drivers/base/memory.c
> +++ b/drivers/base/memory.c
> @@ -651,21 +651,18 @@ int register_memory(struct memory_block *memory)
>  	return ret;
>  }
>  
> -static int init_memory_block(struct memory_block **memory,
> -			     struct mem_section *section, unsigned long state)
> +static int init_memory_block(struct memory_block **memory, int block_id,
> +			     unsigned long state)
>  {
>  	struct memory_block *mem;
>  	unsigned long start_pfn;
> -	int scn_nr;
>  	int ret = 0;
>  
>  	mem = kzalloc(sizeof(*mem), GFP_KERNEL);
>  	if (!mem)
>  		return -ENOMEM;
>  
> -	scn_nr = __section_nr(section);
> -	mem->start_section_nr =
> -			base_memory_block_id(scn_nr) * sections_per_block;
> +	mem->start_section_nr = block_id * sections_per_block;
>  	mem->end_section_nr = mem->start_section_nr + sections_per_block - 1;
>  	mem->state = state;
>  	start_pfn = section_nr_to_pfn(mem->start_section_nr);
> @@ -694,7 +691,8 @@ static int add_memory_block(int base_section_nr)
>  
>  	if (section_count == 0)
>  		return 0;
> -	ret = init_memory_block(&mem, __nr_to_section(section_nr), MEM_ONLINE);
> +	ret = init_memory_block(&mem, base_memory_block_id(base_section_nr),
> +				MEM_ONLINE);
>  	if (ret)
>  		return ret;
>  	mem->section_count = section_count;
> @@ -707,6 +705,7 @@ static int add_memory_block(int base_section_nr)
>   */
>  int hotplug_memory_register(int nid, struct mem_section *section)
>  {
> +	int block_id = base_memory_block_id(__section_nr(section));
>  	int ret = 0;
>  	struct memory_block *mem;
>  
> @@ -717,7 +716,7 @@ int hotplug_memory_register(int nid, struct mem_section *section)
>  		mem->section_count++;
>  		put_device(&mem->dev);
>  	} else {
> -		ret = init_memory_block(&mem, section, MEM_OFFLINE);
> +		ret = init_memory_block(&mem, block_id, MEM_OFFLINE);
>  		if (ret)
>  			goto out;
>  		mem->section_count++;
> -- 
> 2.20.1

-- 
Michal Hocko
SUSE Labs