linux-kernel - Re: [PATCH v8 00/20] Convert x86 & arm64 to use generic page walk

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Message-ID: <3b9561d0-3bde-ef7a-0313-c2cc6216f94d@intel.com>
Date:   Fri, 12 Apr 2019 07:44:37 -0700
From:   Dave Hansen <dave.hansen@...el.com>
To:     Steven Price <steven.price@....com>, linux-mm@...ck.org,
        Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Mark Rutland <Mark.Rutland@....com>, x86@...nel.org,
        Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Will Deacon <will.deacon@....com>,
        linux-kernel@...r.kernel.org,
        Jérôme Glisse <jglisse@...hat.com>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>,
        James Morse <james.morse@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        linux-arm-kernel@...ts.infradead.org,
        "Liang, Kan" <kan.liang@...ux.intel.com>
Subject: Re: [PATCH v8 00/20] Convert x86 & arm64 to use generic page walk

On 4/10/19 7:56 AM, Steven Price wrote:
> Gentle ping: who can take this? Is there anything blocking this series?

First of all, I really appreciate that you tried this.  Every open-coded
page walk has a set of common pitfalls, but is pretty unbounded in what
kinds of bugs it can contain.  I think this at least gets us to the
point where some of those pitfalls won't happen.  That's cool, but I'm a
worried that it hasn't gotten easier in the end.

Linus also had some strong opinions in the past on how page walks should
be written.  He needs to have a look before we go much further.