linux-kernel - Re: [PATCH v2 1/7] kernel/resource: make release_mem_region

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Message-ID: <927904b1-1909-f11f-483e-8012bda8ad0c@redhat.com>
Date:   Tue, 15 Sep 2020 09:35:30 +0200
From:   David Hildenbrand <david@...hat.com>
To:     Wei Yang <richard.weiyang@...ux.alibaba.com>
Cc:     linux-kernel@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, linux-mm@...ck.org,
        linux-hyperv@...r.kernel.org, xen-devel@...ts.xenproject.org,
        linux-acpi@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-s390@...r.kernel.org,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Kees Cook <keescook@...omium.org>,
        Ard Biesheuvel <ardb@...nel.org>,
        Pankaj Gupta <pankaj.gupta.linux@...il.com>,
        Baoquan He <bhe@...hat.com>
Subject: Re: [PATCH v2 1/7] kernel/resource: make
 release_mem_region_adjustable() never fail


>> 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))

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

-- 
Thanks,

David / dhildenb