linux-kernel - Re: [PATCH v2 03/14] arm64, hibernate: add trans

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Message-ID: <20190820113000.GA49252@lakrids.cambridge.arm.com>
Date:   Tue, 20 Aug 2019 12:30:10 +0100
From:   Mark Rutland <mark.rutland@....com>
To:     Pavel Tatashin <pasha.tatashin@...een.com>
Cc:     James Morris <jmorris@...ei.org>, Sasha Levin <sashal@...nel.org>,
        "Eric W. Biederman" <ebiederm@...ssion.com>,
        kexec mailing list <kexec@...ts.infradead.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Jonathan Corbet <corbet@....net>,
        Catalin Marinas <catalin.marinas@....com>, will@...nel.org,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>,
        Marc Zyngier <marc.zyngier@....com>,
        James Morse <james.morse@....com>,
        Vladimir Murzin <vladimir.murzin@....com>,
        Matthias Brugger <matthias.bgg@...il.com>,
        Bhupesh Sharma <bhsharma@...hat.com>,
        linux-mm <linux-mm@...ck.org>
Subject: Re: [PATCH v2 03/14] arm64, hibernate: add trans_table public
 functions

On Mon, Aug 19, 2019 at 12:33:31PM -0400, Pavel Tatashin wrote:
> On Mon, Aug 19, 2019 at 11:58 AM Mark Rutland <mark.rutland@....com> wrote:
> > On Fri, Aug 16, 2019 at 10:46:18PM -0400, Pavel Tatashin wrote:
> > > trans_table_create_copy() and trans_table_map_page() are going to be
> > > the basis for public interface of new subsystem that handles page
> > > tables for cases which are between kernels: kexec, and hibernate.
> >
> > While the architecture uses the term 'translation table', in the kernel
> > we generally use 'pgdir' or 'pgd' to refer to the tables, so please keep
> > to that naming scheme.
> 
> The idea is to have a unique name space for new subsystem of page
> tables that are used between kernels:
> between stage 1 and stage 2 kexec kernel, and similarly between
> kernels during hibernate boot process.
> 
> I picked: "trans_table" that stands for transitional page table:
> meaning they are used only during transition between worlds.
> 
> All public functions in this subsystem will have trans_table_* prefix,
> and page directory will be named: "trans_table". If this is confusing,
> I can either use a different prefix, or describe what "trans_table"
> stand for in trans_table.h/.c

Ok.

I think that "trans_table" is unfortunately confusing, as it clashes
with the architecture terminology, and differs from what we have
elsewhere.

I think that "trans_pgd" would be better, as that better aligns with
what we have elsewhere, and avoids the ambiguity.

Thanks,
Mark.