linux-kernel - Re: [PATCH v3 05/13] mm: introduce CONFIG_ARCH_LAZY

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Message-ID: <dd3011ec-23cc-4431-95a3-a0c2965e7062@redhat.com>
Date: Thu, 23 Oct 2025 21:38:10 +0200
From: David Hildenbrand <david@...hat.com>
To: Kevin Brodsky <kevin.brodsky@....com>, Mike Rapoport <rppt@...nel.org>
Cc: linux-mm@...ck.org, 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 S. Miller" <davem@...emloft.net>, "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>,
 Nicholas Piggin <npiggin@...il.com>, Peter Zijlstra <peterz@...radead.org>,
 Ryan Roberts <ryan.roberts@....com>, 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 v3 05/13] mm: introduce CONFIG_ARCH_LAZY_MMU

On 20.10.25 12:37, Kevin Brodsky wrote:
> On 18/10/2025 11:52, Mike Rapoport wrote:
>>> @@ -231,7 +231,7 @@ static inline int pmd_dirty(pmd_t pmd)
>>>    * held, but for kernel PTE updates, no lock is held). Nesting is not permitted
>>>    * and the mode cannot be used in interrupt context.
>>>    */
>>> -#ifndef __HAVE_ARCH_ENTER_LAZY_MMU_MODE
>>> +#ifndef CONFIG_ARCH_LAZY_MMU
>>>   static inline void arch_enter_lazy_mmu_mode(void) {}
>>>   static inline void arch_leave_lazy_mmu_mode(void) {}
>>>   static inline void arch_flush_lazy_mmu_mode(void) {}
>>> diff --git a/mm/Kconfig b/mm/Kconfig
>>> index 0e26f4fc8717..2fdcb42ca1a1 100644
>>> --- a/mm/Kconfig
>>> +++ b/mm/Kconfig
>>> @@ -1372,6 +1372,9 @@ config PT_RECLAIM
>>>   config FIND_NORMAL_PAGE
>>>   	def_bool n
>>>   
>>> +config ARCH_LAZY_MMU
>>> +	bool
>>> +
>> I think a better name would be ARCH_HAS_LAZY_MMU and the config option fits
>> better to arch/Kconfig.
> 
> Sounds fine by me - I'm inclined to make it slightly longer still,
> ARCH_HAS_LAZY_MMU_MODE, to avoid making "LAZY_MMU" sound like some HW
> feature.

LGTM.

-- 
Cheers

David / dhildenb