linux-kernel - Re: [PATCH v4 09/12] powerpc/mm: replace batch->active with in_lazy_mmu

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Message-ID: <87ldkk4y2j.ritesh.list@gmail.com>
Date: Wed, 05 Nov 2025 15:10:20 +0530
From: Ritesh Harjani (IBM) <ritesh.list@...il.com>
To: Kevin Brodsky <kevin.brodsky@....com>, linux-mm@...ck.org
Cc: linux-kernel@...r.kernel.org, Kevin Brodsky <kevin.brodsky@....com>, 
	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>, 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 v4 09/12] powerpc/mm: replace batch->active with in_lazy_mmu_mode()

Kevin Brodsky <kevin.brodsky@....com> writes:

> A per-CPU batch struct is activated when entering lazy MMU mode; its
> lifetime is the same as the lazy MMU section (it is deactivated when
> leaving the mode). Preemption is disabled in that interval to ensure
> that the per-CPU reference remains valid.
>
> The generic lazy_mmu layer now tracks whether a task is in lazy MMU
> mode. We can therefore use the generic helper in_lazy_mmu_mode()
> to tell whether a batch struct is active instead of tracking it
> explicitly.
>
> Signed-off-by: Kevin Brodsky <kevin.brodsky@....com>
> ---
>  arch/powerpc/include/asm/book3s/64/tlbflush-hash.h | 9 ---------
>  arch/powerpc/mm/book3s64/hash_tlb.c                | 2 +-
>  2 files changed, 1 insertion(+), 10 deletions(-)
>

This looks good to me.

Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@...il.com>