linux-kernel - Re: [PATCH] arm64: configurable sparsemem section size

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Message-ID: <CA+CK2bC7iEsg8Fdep6kphNTNroCi_zi1ejApspSZyTq_VFvxOw@mail.gmail.com>
Date:   Wed, 24 Apr 2019 16:33:10 -0400
From:   Pavel Tatashin <pasha.tatashin@...een.com>
To:     Dan Williams <dan.j.williams@...el.com>
Cc:     Anshuman Khandual <anshuman.khandual@....com>,
        James Morris <jmorris@...ei.org>,
        Sasha Levin <sashal@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-mm <linux-mm@...ck.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Keith Busch <keith.busch@...el.com>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Ross Zwisler <zwisler@...nel.org>,
        Tom Lendacky <thomas.lendacky@....com>,
        "Huang, Ying" <ying.huang@...el.com>,
        Fengguang Wu <fengguang.wu@...el.com>,
        Borislav Petkov <bp@...e.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Yaowei Bai <baiyaowei@...s.chinamobile.com>,
        Takashi Iwai <tiwai@...e.de>,
        Jérôme Glisse <jglisse@...hat.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will.deacon@....com>, rppt@...ux.vnet.ibm.com,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        andrew.murray@....com, james.morse@....com,
        Marc Zyngier <marc.zyngier@....com>, sboyd@...nel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH] arm64: configurable sparsemem section size

> This is yet another example of where we need to break down the section
> alignment requirement for arch_add_memory().
>
> https://lore.kernel.org/lkml/155552633539.2015392.2477781120122237934.stgit@dwillia2-desk3.amr.corp.intel.com/

Hi Dan,

Yes, that is exactly what I am trying to solve with this patch. I will
test if your series works with ARM64, and if does not I will let you
know what is broken. But, I think, this patch is not needed if your
patches are accepted into mainline.

Thank you,
Pasha