linux-kernel - Re: [PATCH v3] mm: pagewalk: Fix walk for hugepage tables

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Message-Id: <20210627181226.983d899cc30c02420e1a6af5@linux-foundation.org>
Date:   Sun, 27 Jun 2021 18:12:26 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Christophe Leroy <christophe.leroy@...roup.eu>
Cc:     Steven Price <steven.price@....com>, linux-mm@...ck.org,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>, dja@...ens.net,
        "Oliver O'Halloran" <oohall@...il.com>, linux-arch@...r.kernel.org,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3] mm: pagewalk: Fix walk for hugepage tables

On Fri, 25 Jun 2021 05:10:12 +0000 (UTC) Christophe Leroy <christophe.leroy@...roup.eu> wrote:

> Pagewalk ignores hugepd entries and walk down the tables
> as if it was traditionnal entries, leading to crazy result.
> 
> Add walk_hugepd_range() and use it to walk hugepage tables.

More details, please?  I assume "crazy result" is userspace visible? 
For how long has this bug existed?  Is a -stable backport needed?  Has
a Fixes: commit been identified?  etcetera!