linux-kernel - Re: [PATCH v3 06/13] mm: introduce generic lazy

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Message-ID: <55f8b155-5468-43fc-b6fc-f509f4becd5b-agordeev@linux.ibm.com>
Date: Fri, 17 Oct 2025 17:54:14 +0200
From: Alexander Gordeev <agordeev@...ux.ibm.com>
To: Kevin Brodsky <kevin.brodsky@....com>
Cc: linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        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>,
        "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>,
        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 06/13] mm: introduce generic lazy_mmu helpers

On Wed, Oct 15, 2025 at 09:27:20AM +0100, Kevin Brodsky wrote:

Hi Kevin,

...
> * lazy_mmu_mode_pause() ... lazy_mmu_mode_resume()
>     This is for situations where the mode is temporarily disabled
>     by first calling pause() and then resume() (e.g. to prevent any
>     batching from occurring in a critical section).
...
> +static inline void lazy_mmu_mode_pause(void)
> +{
> +	arch_leave_lazy_mmu_mode();

I think it should have been arch_pause_lazy_mmu_mode(), wich defaults
to  arch_leave_lazy_mmu_mode(), as we discussed in v2:

https://lore.kernel.org/linux-mm/d407a381-099b-4ec6-a20e-aeff4f3d750f@arm.com/#t

> +}
> +
> +static inline void lazy_mmu_mode_resume(void)
> +{
> +	arch_enter_lazy_mmu_mode();
> +}

Thanks!