linux-kernel - Re: [PATCH] arm64: Define only {pud/pmd}_{set/clear}

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Message-ID: <YJ9HAg+o8nd2xmix@archlinux-ax161>
Date:   Fri, 14 May 2021 20:58:58 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Christophe Leroy <christophe.leroy@...roup.eu>,
        Nicholas Piggin <npiggin@...il.com>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...nel.org>, naresh.kamboju@...aro.org,
        linux-arch@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        sparclinux@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] arm64: Define only {pud/pmd}_{set/clear}_huge when
 usefull

On Fri, May 14, 2021 at 02:42:00PM -0700, Andrew Morton wrote:
> On Fri, 14 May 2021 11:08:53 +0000 (UTC) Christophe Leroy <christophe.leroy@...roup.eu> wrote:
> 
> > When PUD and/or PMD are folded, those functions are useless
> > and we now have a stub in linux/pgtable.h
> 
> OK, help me out here please.  What patch does this fix?
> 

Naresh's original report is here it seems:

https://lore.kernel.org/r/CA+G9fYv79t0+2W4Rt3wDkBShc4eY3M3utC5BHqUgGDwMYExYMw@mail.gmail.com/

I can reproduce the failure that he reported with
ARCH=arm64 allmodconfig and this patch resolves it for me.

Cheers,
Nathan