From: Michael Ellerman <mpe@ellerman.id.au>
To: Will Deacon <will@kernel.org>,
Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Will Deacon <will@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
linuxppc-dev@lists.ozlabs.org,
Mark Rutland <mark.rutland@arm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Andrew Morton <akpm@linux-foundation.org>,
Mike Rapoport <rppt@kernel.org>, Ard Biesheuvel <ardb@kernel.org>,
linux-arm-kernel@lists.infradead.org,
Paul Mackerras <paulus@samba.org>,
Jonathan Marek <jonathan@marek.ca>,
linux-kernel@vger.kernel.org, Marc Zyngier <maz@kernel.org>,
Nicholas Piggin <npiggin@gmail.com>
Subject: Re: [PATCH v2] Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge"
Date: Fri, 23 Jul 2021 22:04:10 +1000 [thread overview]
Message-ID: <87o8at1bk5.fsf@mpe.ellerman.id.au> (raw)
In-Reply-To: <162686329170.980657.905966885675716231.b4-ty@kernel.org>
Will Deacon <will@kernel.org> writes:
> On Wed, 21 Jul 2021 17:02:13 +1000, Michael Ellerman wrote:
>> This reverts commit c742199a014de23ee92055c2473d91fe5561ffdf.
>>
>> c742199a014d ("mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge")
>> breaks arm64 in at least two ways for configurations where PUD or PMD
>> folding occur:
>>
>> 1. We no longer install huge-vmap mappings and silently fall back to
>> page-granular entries, despite being able to install block entries
>> at what is effectively the PGD level.
>>
>> [...]
>
> Thank you Michael! I owe you a beer next time I see you, if we don't go
> extinct before then.
No worries, thanks to Christophe for identifying the solution while on
vacation!
Beers seem a long way off, but hopefully one day :)
cheers
prev parent reply other threads:[~2021-07-23 12:04 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-20 12:35 [PATCH 0/2] Fix arm64 boot regression in 5.14 Will Deacon
2021-07-20 12:35 ` [PATCH 1/2] Revert "powerpc/8xx: add support for huge pages on VMAP and VMALLOC" Will Deacon
2021-07-20 15:08 ` Christophe Leroy
2021-07-20 12:35 ` [PATCH 2/2] Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" Will Deacon
2021-07-20 12:39 ` [PATCH 0/2] Fix arm64 boot regression in 5.14 Ard Biesheuvel
2021-07-20 12:53 ` Marc Zyngier
2021-07-20 18:26 ` Christophe Leroy
2021-07-21 7:02 ` [PATCH v2] Revert "mm/pgtable: add stubs for {pmd/pub}_{set/clear}_huge" Michael Ellerman
2021-07-21 10:47 ` Will Deacon
2021-07-23 12:04 ` Michael Ellerman [this message]
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