linux-kernel - Re: [PATCH v1] mm: Remove arch_flush_tlb_batched

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Message-ID: <20250612152058.GE12912@willie-the-truck>
Date: Thu, 12 Jun 2025 16:20:59 +0100
From: Will Deacon <will@...nel.org>
To: Ryan Roberts <ryan.roberts@....com>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
	Catalin Marinas <catalin.marinas@....com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Palmer Dabbelt <palmer@...belt.com>,
	Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	David Hildenbrand <david@...hat.com>,
	Lorenzo Stoakes <lorenzo.stoakes@...cle.com>,
	Rik van Riel <riel@...riel.com>,
	"Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Vlastimil Babka <vbabka@...e.cz>, Harry Yoo <harry.yoo@...cle.com>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org, linux-mm@...ck.org
Subject: Re: [PATCH v1] mm: Remove arch_flush_tlb_batched_pending() arch
 helper

On Mon, Jun 09, 2025 at 11:31:30AM +0100, Ryan Roberts wrote:
> Since commit 4b634918384c ("arm64/mm: Close theoretical race where stale
> TLB entry remains valid"), all arches that use tlbbatch for reclaim
> (arm64, riscv, x86) implement arch_flush_tlb_batched_pending() with a
> flush_tlb_mm().
> 
> So let's simplify by removing the unnecessary abstraction and doing the
> flush_tlb_mm() directly in flush_tlb_batched_pending(). This effectively
> reverts commit db6c1f6f236d ("mm/tlbbatch: introduce
> arch_flush_tlb_batched_pending()").
> 
> Suggested-by: Will Deacon <will@...nel.org>
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>
> ---
>  arch/arm64/include/asm/tlbflush.h | 11 -----------
>  arch/riscv/include/asm/tlbflush.h |  1 -
>  arch/riscv/mm/tlbflush.c          |  5 -----
>  arch/x86/include/asm/tlbflush.h   |  5 -----
>  mm/rmap.c                         |  2 +-
>  5 files changed, 1 insertion(+), 23 deletions(-)

Thank you, Ryan!

Acked-by: Will Deacon <will@...nel.org>

I assume this will go via akpm rather than the arch tree?

Will