linux-kernel - Re: [PATCH 3/3] mm: Change __remove_pages() to call release_mem_region

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Date:	Wed, 3 Apr 2013 10:28:48 +0900
From:	Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>
To:	Toshi Kani <toshi.kani@...com>
CC:	<akpm@...ux-foundation.org>, <linux-mm@...ck.org>,
	<linux-kernel@...r.kernel.org>, <linuxram@...ibm.com>,
	<tmac@...com>, <wency@...fujitsu.com>, <tangchen@...fujitsu.com>,
	<jiang.liu@...wei.com>
Subject: Re: [PATCH 3/3] mm: Change __remove_pages() to call release_mem_region_adjustable()

Hi Toshi,

2013/04/03 1:17, Toshi Kani wrote:
> Changed __remove_pages() to call release_mem_region_adjustable().
> This allows a requested memory range to be released from
> the iomem_resource table even if it does not match exactly to
> an resource entry but still fits into.  The resource entries
> initialized at bootup usually cover the whole contiguous
> memory ranges and may not necessarily match with the size of
> memory hot-delete requests.
> 
> If release_mem_region_adjustable() failed, __remove_pages() logs
> an error message and continues to proceed as it was the case
> with release_mem_region().  release_mem_region(), which is defined
> to __release_region(), logs an error message and returns no error
> since a void function.
> 
> Signed-off-by: Toshi Kani <toshi.kani@...com>

The patch looks good.
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@...fujitsu.com>

Thanks,
Yasuaki Ishimatsu

> ---
>   mm/memory_hotplug.c |   11 +++++++++--
>   1 file changed, 9 insertions(+), 2 deletions(-)
> 
> diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c
> index 57decb2..c916582 100644
> --- a/mm/memory_hotplug.c
> +++ b/mm/memory_hotplug.c
> @@ -705,8 +705,10 @@ EXPORT_SYMBOL_GPL(__add_pages);
>   int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
>   		 unsigned long nr_pages)
>   {
> -	unsigned long i, ret = 0;
> +	unsigned long i;
>   	int sections_to_remove;
> +	resource_size_t start, size;
> +	int ret = 0;
>   
>   	/*
>   	 * We can only remove entire sections
> @@ -714,7 +716,12 @@ int __remove_pages(struct zone *zone, unsigned long phys_start_pfn,
>   	BUG_ON(phys_start_pfn & ~PAGE_SECTION_MASK);
>   	BUG_ON(nr_pages % PAGES_PER_SECTION);
>   
> -	release_mem_region(phys_start_pfn << PAGE_SHIFT, nr_pages * PAGE_SIZE);
> +	start = phys_start_pfn << PAGE_SHIFT;
> +	size = nr_pages * PAGE_SIZE;
> +	ret = release_mem_region_adjustable(&iomem_resource, start, size);
> +	if (ret)
> +		pr_warn("Unable to release resource <%016llx-%016llx> (%d)\n",
> +				start, start + size - 1, ret);
>   
>   	sections_to_remove = nr_pages / PAGES_PER_SECTION;
>   	for (i = 0; i < sections_to_remove; i++) {
> 


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