linux-kernel - Re: [PATCH V3 (RESEND) 0/3] arm64: Enable vmemmap mapping from device memory

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Message-ID: <27f8c6f9-3970-6f02-dff4-7ca15bee7138@arm.com>
Date:   Fri, 19 Jun 2020 07:04:35 +0530
From:   Anshuman Khandual <anshuman.khandual@....com>
To:     Mike Rapoport <rppt@...ux.ibm.com>
Cc:     linux-mm@...ck.org, Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>,
        Palmer Dabbelt <palmer@...belt.com>,
        Tony Luck <tony.luck@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        David Hildenbrand <david@...hat.com>,
        Michal Hocko <mhocko@...e.com>,
        "Matthew Wilcox (Oracle)" <willy@...radead.org>,
        "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Dan Williams <dan.j.williams@...el.com>,
        Pavel Tatashin <pasha.tatashin@...een.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linux-arm-kernel@...ts.infradead.org, linux-ia64@...r.kernel.org,
        linux-riscv@...ts.infradead.org, x86@...nel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V3 (RESEND) 0/3] arm64: Enable vmemmap mapping from device
 memory



On 06/18/2020 02:26 PM, Mike Rapoport wrote:
> On Thu, Jun 18, 2020 at 06:45:27AM +0530, Anshuman Khandual wrote:
>> This series enables vmemmap backing memory allocation from device memory
>> ranges on arm64. But before that, it enables vmemmap_populate_basepages()
>> and vmemmap_alloc_block_buf() to accommodate struct vmem_altmap based
>> alocation requests.
>>
>> This series applies on 5.8-rc1.
>>
>> Pending Question:
>>
>> altmap_alloc_block_buf() does not have any other remaining users in
>> the tree after this change. Should it be converted into a static
>> function and it's declaration be dropped from the header
>> (include/linux/mm.h). Avoided doing so because I was not sure if there
>> are any off-tree users or not.
> 
> Well, off-tree users probably have an active fork anyway so they could
> switch to vmemmap_alloc_block_buf()...

Sure, will make the function a static and remove it's declaration
from the header.

> 
> Regardless, can you please update Documentation/vm/memory-model.rst to
> keep it in sync with the code?
Sure, will do.