linux-kernel - Re: [PATCH] mm/hotplug: rename the function is_memblock_offlined

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Date:	Mon, 9 Sep 2013 09:52:20 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Xishi Qiu <qiuxishi@...wei.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Wen Congyang <wency@...fujitsu.com>,
	Tang Chen <tangchen@...fujitsu.com>,
	Toshi Kani <toshi.kani@...com>, <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm/hotplug: rename the function is_memblock_offlined_cb()

(2013/09/06 17:54), Xishi Qiu wrote:
> Function is_memblock_offlined() return 1 means memory block is offlined,
> but is_memblock_offlined_cb() return 1 means memory block is not offlined,
> this will confuse somebody, so rename the function.
> Another, use "pfn_to_nid(pfn)" instead of "page_to_nid(pfn_to_page(pfn))".
>
> Signed-off-by: Xishi Qiu <qiuxishi@...wei.com>
> ---

It looks good to me. But I have one comment.
Please see below.

>   mm/memory_hotplug.c |    6 +++---
>   1 files changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index ca1dd3a..a95dd28 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -937,7 +937,7 @@ int __ref online_pages(unsigned long pfn, unsigned long nr_pages, int online_typ
>   	arg.nr_pages = nr_pages;
>   	node_states_check_changes_online(nr_pages, zone, &arg);
>

> -	nid = page_to_nid(pfn_to_page(pfn));
> +	nid = pfn_to_nid(pfn);

Please split the cleanup from this patch since the cleanup has
nothing to do with the description of this patch.

Thanks,
Yasuaki Ishimatsu

>
>   	ret = memory_notify(MEM_GOING_ONLINE, &arg);
>   	ret = notifier_to_errno(ret);
> @@ -1657,7 +1657,7 @@ int walk_memory_range(unsigned long start_pfn, unsigned long end_pfn,
>   }
>
>   #ifdef CONFIG_MEMORY_HOTREMOVE
> -static int is_memblock_offlined_cb(struct memory_block *mem, void *arg)
> +static int check_memblock_offlined_cb(struct memory_block *mem, void *arg)
>   {
>   	int ret = !is_memblock_offlined(mem);
>
> @@ -1794,7 +1794,7 @@ void __ref remove_memory(int nid, u64 start, u64 size)
>   	 * if this is not the case.
>   	 */
>   	ret = walk_memory_range(PFN_DOWN(start), PFN_UP(start + size - 1), NULL,
> -				is_memblock_offlined_cb);
> +				check_memblock_offlined_cb);
>   	if (ret) {
>   		unlock_memory_hotplug();
>   		BUG();
>


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