linux-kernel - Re: [PATCH v6 07/18] arm64/mm: Convert READ_ONCE(*ptep) to ptep

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Message-ID: <Zc5ZGNaYp5dFND1_@arm.com>
Date: Thu, 15 Feb 2024 18:34:00 +0000
From: Catalin Marinas <catalin.marinas@....com>
To: Ryan Roberts <ryan.roberts@....com>
Cc: Will Deacon <will@...nel.org>, Ard Biesheuvel <ardb@...nel.org>,
	Marc Zyngier <maz@...nel.org>, James Morse <james.morse@....com>,
	Andrey Ryabinin <ryabinin.a.a@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Matthew Wilcox <willy@...radead.org>,
	Mark Rutland <mark.rutland@....com>,
	David Hildenbrand <david@...hat.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	John Hubbard <jhubbard@...dia.com>, Zi Yan <ziy@...dia.com>,
	Barry Song <21cnbao@...il.com>,
	Alistair Popple <apopple@...dia.com>,
	Yang Shi <shy828301@...il.com>,
	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>,
	linux-arm-kernel@...ts.infradead.org, x86@...nel.org,
	linuxppc-dev@...ts.ozlabs.org, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 07/18] arm64/mm: Convert READ_ONCE(*ptep) to
 ptep_get(ptep)

On Thu, Feb 15, 2024 at 10:31:54AM +0000, Ryan Roberts wrote:
> There are a number of places in the arch code that read a pte by using
> the READ_ONCE() macro. Refactor these call sites to instead use the
> ptep_get() helper, which itself is a READ_ONCE(). Generated code should
> be the same.
> 
> This will benefit us when we shortly introduce the transparent contpte
> support. In this case, ptep_get() will become more complex so we now
> have all the code abstracted through it.
> 
> Tested-by: John Hubbard <jhubbard@...dia.com>
> Signed-off-by: Ryan Roberts <ryan.roberts@....com>

Acked-by: Catalin Marinas <catalin.marinas@....com>