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

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Date:   Thu, 18 Jun 2020 11:56:41 +0300
From:   Mike Rapoport <rppt@...ux.ibm.com>
To:     Anshuman Khandual <anshuman.khandual@....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 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()...

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

> Changes in V3:
> 
> - Dropped comment from free_hotplug_page_range() per Robin
> - Modified comment in unmap_hotplug_range() per Robin
> - Enabled altmap support in vmemmap_alloc_block_buf() per Robin
> 
> Changes in V2: (https://lkml.org/lkml/2020/3/4/475)
> 
> - Rebased on latest hot-remove series (v14) adding P4D page table support
> 
> Changes in V1: (https://lkml.org/lkml/2020/1/23/12)
> 
> - Added an WARN_ON() in unmap_hotplug_range() when altmap is
>   provided without the page table backing memory being freed
> 
> Changes in RFC V2: (https://lkml.org/lkml/2019/10/21/11)
> 
> - Changed the commit message on 1/2 patch per Will
> - Changed the commit message on 2/2 patch as well
> - Rebased on arm64 memory hot remove series (v10)
> 
> RFC V1: (https://lkml.org/lkml/2019/6/28/32)
> 
> Cc: Catalin Marinas <catalin.marinas@....com>
> Cc: Will Deacon <will@...nel.org>
> Cc: Mark Rutland <mark.rutland@....com>
> Cc: Paul Walmsley <paul.walmsley@...ive.com>
> Cc: Palmer Dabbelt <palmer@...belt.com>
> Cc: Tony Luck <tony.luck@...el.com>
> Cc: Fenghua Yu <fenghua.yu@...el.com>
> Cc: Dave Hansen <dave.hansen@...ux.intel.com>
> Cc: Andy Lutomirski <luto@...nel.org>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...hat.com>
> Cc: David Hildenbrand <david@...hat.com>
> Cc: Mike Rapoport <rppt@...ux.ibm.com>
> Cc: Michal Hocko <mhocko@...e.com>
> Cc: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> Cc: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Cc: Pavel Tatashin <pasha.tatashin@...een.com>
> Cc: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> Cc: Paul Mackerras <paulus@...ba.org>
> Cc: Michael Ellerman <mpe@...erman.id.au>
> Cc: linux-arm-kernel@...ts.infradead.org
> Cc: linux-ia64@...r.kernel.org
> Cc: linux-riscv@...ts.infradead.org
> Cc: x86@...nel.org
> Cc: linuxppc-dev@...ts.ozlabs.org
> Cc: linux-mm@...ck.org
> Cc: linux-kernel@...r.kernel.org
> 
> Anshuman Khandual (3):
>   mm/sparsemem: Enable vmem_altmap support in vmemmap_populate_basepages()
>   mm/sparsemem: Enable vmem_altmap support in vmemmap_alloc_block_buf()
>   arm64/mm: Enable vmem_altmap support for vmemmap mappings
> 
>  arch/arm64/mm/mmu.c       | 59 ++++++++++++++++++++++++++-------------
>  arch/ia64/mm/discontig.c  |  2 +-
>  arch/powerpc/mm/init_64.c | 10 +++----
>  arch/riscv/mm/init.c      |  2 +-
>  arch/x86/mm/init_64.c     | 12 ++++----
>  include/linux/mm.h        |  8 ++++--
>  mm/sparse-vmemmap.c       | 38 ++++++++++++++++++++-----
>  7 files changed, 87 insertions(+), 44 deletions(-)
> 
> -- 
> 2.20.1
> 

-- 
Sincerely yours,
Mike.