linux-kernel - Re: [PATCH v4 05/12] mm: introduce CONFIG_ARCH_HAS_LAZY_MMU

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Message-ID: <0d00dd6e-9e39-4ac6-8ea4-9407e75947eb@arm.com>
Date: Mon, 10 Nov 2025 11:37:41 +0100
From: Kevin Brodsky <kevin.brodsky@....com>
To: Ryan Roberts <ryan.roberts@....com>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, Alexander Gordeev <agordeev@...ux.ibm.com>,
 Andreas Larsson <andreas@...sler.com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Boris Ostrovsky <boris.ostrovsky@...cle.com>, Borislav Petkov
 <bp@...en8.de>, Catalin Marinas <catalin.marinas@....com>,
 Christophe Leroy <christophe.leroy@...roup.eu>,
 Dave Hansen <dave.hansen@...ux.intel.com>,
 David Hildenbrand <david@...hat.com>, "David S. Miller"
 <davem@...emloft.net>, David Woodhouse <dwmw2@...radead.org>,
 "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
 Jann Horn <jannh@...gle.com>, Juergen Gross <jgross@...e.com>,
 "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
 Madhavan Srinivasan <maddy@...ux.ibm.com>,
 Michael Ellerman <mpe@...erman.id.au>, Michal Hocko <mhocko@...e.com>,
 Mike Rapoport <rppt@...nel.org>, Nicholas Piggin <npiggin@...il.com>,
 Peter Zijlstra <peterz@...radead.org>, Suren Baghdasaryan
 <surenb@...gle.com>, Thomas Gleixner <tglx@...utronix.de>,
 Vlastimil Babka <vbabka@...e.cz>, Will Deacon <will@...nel.org>,
 Yeoreum Yun <yeoreum.yun@....com>, linux-arm-kernel@...ts.infradead.org,
 linuxppc-dev@...ts.ozlabs.org, sparclinux@...r.kernel.org,
 xen-devel@...ts.xenproject.org, x86@...nel.org
Subject: Re: [PATCH v4 05/12] mm: introduce CONFIG_ARCH_HAS_LAZY_MMU_MODE

On 07/11/2025 13:56, Ryan Roberts wrote:
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 6663ffd23f25..e6bf5c7311b5 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -122,6 +122,7 @@ config ARM64
>>  	select ARCH_WANTS_NO_INSTR
>>  	select ARCH_WANTS_THP_SWAP if ARM64_4K_PAGES
>>  	select ARCH_HAS_UBSAN
>> +	select ARCH_HAS_LAZY_MMU_MODE
> nit: This list is mostly in alphabetical order. Further up the list there are a
> lot of ARCH_HAS_* entries. Perhaps move it to the correct position in that lot?
> Then ARCH_HAS_UBSAN stays out of order on its own.

That's fair, it does look like it's mostly in order apart from
ARCH_HAS_UBSAN. Will move it further up.

- Kevin