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From: David Hildenbrand <david@redhat.com>
To: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: linux-kernel@vger.kernel.org,
	virtualization@lists.linux-foundation.org, linux-mm@kvack.org,
	linux-hyperv@vger.kernel.org, xen-devel@lists.xenproject.org,
	linux-acpi@vger.kernel.org, linux-nvdimm@lists.01.org,
	linux-s390@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Michal Hocko <mhocko@suse.com>, Jason Gunthorpe <jgg@ziepe.ca>,
	Kees Cook <keescook@chromium.org>,
	Ard Biesheuvel <ardb@kernel.org>,
	Pankaj Gupta <pankaj.gupta.linux@gmail.com>,
	Baoquan He <bhe@redhat.com>
Subject: Re: [PATCH v2 1/7] kernel/resource: make release_mem_region_adjustable() never fail
Date: Tue, 15 Sep 2020 11:15:53 +0200	[thread overview]
Message-ID: <bc324c26-3638-ffa6-ee01-68a659183adf@redhat.com> (raw)
In-Reply-To: <20200915090612.GA6936@L-31X9LVDL-1304.local>

On 15.09.20 11:06, Wei Yang wrote:
> On Tue, Sep 15, 2020 at 09:35:30AM +0200, David Hildenbrand wrote:
>>
>>>> static int __ref try_remove_memory(int nid, u64 start, u64 size)
>>>> {
>>>> 	int rc = 0;
>>>> @@ -1777,7 +1757,7 @@ static int __ref try_remove_memory(int nid, u64 start, u64 size)
>>>> 		memblock_remove(start, size);
>>>> 	}
>>>>
>>>> -	__release_memory_resource(start, size);
>>>> +	release_mem_region_adjustable(&iomem_resource, start, size);
>>>>
>>>
>>> Seems the only user of release_mem_region_adjustable() is here, can we move
>>> iomem_resource into the function body? Actually, we don't iterate the resource
>>> tree from any level. We always start from the root.
>>
>> You mean, making iomem_resource implicit? I can spot that something
>> similar was done for
>>
>> #define devm_release_mem_region(dev, start, n) \
>> 	__devm_release_region(dev, &iomem_resource, (start), (n))
>>
> 
> What I prefer is remove iomem_resource from the parameter list. Just use is in
> the function body.
> 
> For the example you listed, __release_region() would have varies of *parent*,
> which looks reasonable to keep it here.

Yeah I got that ("making iomem_resource implicit"), as I said:

>> I'll send an addon patch for that, ok? - thanks.

-- 
Thanks,

David / dhildenb
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  reply	other threads:[~2020-09-15  9:16 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-08 20:10 [PATCH v2 0/7] mm/memory_hotplug: selective merging of system ram resources David Hildenbrand
2020-09-08 20:10 ` [PATCH v2 1/7] kernel/resource: make release_mem_region_adjustable() never fail David Hildenbrand
2020-09-15  2:07   ` Wei Yang
2020-09-15  2:10   ` Wei Yang
2020-09-15  7:35     ` David Hildenbrand
2020-09-15  9:06       ` Wei Yang
2020-09-15  9:15         ` David Hildenbrand [this message]
2020-09-15  9:33           ` Wei Yang
2020-09-08 20:10 ` [PATCH v2 2/7] kernel/resource: move and rename IORESOURCE_MEM_DRIVER_MANAGED David Hildenbrand
2020-09-09  7:16   ` Greg Kroah-Hartman
2020-09-09  7:27     ` David Hildenbrand
2020-09-15  2:20   ` Wei Yang
2020-09-15  7:37     ` David Hildenbrand
2020-09-08 20:10 ` [PATCH v2 3/7] mm/memory_hotplug: prepare passing flags to add_memory() and friends David Hildenbrand
2020-09-09  5:18   ` Jürgen Groß
2020-09-09  7:17   ` Greg Kroah-Hartman
2020-09-09  7:28     ` David Hildenbrand
2020-09-09 11:24       ` Michael Ellerman
2020-09-09 11:37         ` David Hildenbrand
2020-09-09 11:51           ` David Hildenbrand
2020-09-08 20:10 ` [PATCH v2 4/7] mm/memory_hotplug: MEMHP_MERGE_RESOURCE to specify merging of System RAM resources David Hildenbrand
2020-09-08 20:10 ` [PATCH v2 5/7] virtio-mem: try to merge system ram resources David Hildenbrand
2020-09-08 20:10 ` [PATCH v2 6/7] xen/balloon: " David Hildenbrand
2020-09-09  5:18   ` Jürgen Groß
2020-09-08 20:10 ` [PATCH v2 7/7] hv_balloon: " David Hildenbrand
2020-09-09  9:43   ` Wei Liu

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