linux-kernel - Re: [PATCH v2 1/2] kasan/hw-tags: introduce kasan.store

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Message-ID: <aJ9yYZyQtMHyS4n1@arm.com>
Date: Fri, 15 Aug 2025 18:46:09 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: Yeoreum Yun <yeoreum.yun@....com>
Cc: ryabinin.a.a@...il.com, glider@...gle.com, andreyknvl@...il.com,
	dvyukov@...gle.com, vincenzo.frascino@....com, corbet@....net,
	will@...nel.org, akpm@...ux-foundation.org,
	scott@...amperecomputing.com, jhubbard@...dia.com,
	pankaj.gupta@....com, leitao@...ian.org, kaleshsingh@...gle.com,
	maz@...nel.org, broonie@...nel.org, oliver.upton@...ux.dev,
	james.morse@....com, ardb@...nel.org,
	hardevsinh.palaniya@...iconsignals.io, david@...hat.com,
	yang@...amperecomputing.com, kasan-dev@...glegroups.com,
	workflows@...r.kernel.org, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-mm@...ck.org
Subject: Re: [PATCH v2 1/2] kasan/hw-tags: introduce kasan.store_only option

On Fri, Aug 15, 2025 at 03:47:17PM +0100, Yeoreum Yun wrote:
> > If we do something like mte_enable_kernel_asymm(), that one doesn't
> > return any error, just fall back to the default mode.
> 
> But, in case of mte_enable_kernel_asymm() need return to
> change kasan_flag_write_only = false when it doesn't support which
> used in KASAN Kunit test.
> 
> If we don't return anything, when user set the write_only but HW doesn't
> support it, KUNIT test get failure since kasan_write_only_enabled()
> return true thou HW doesn't support it.

Ah, ok, if we need this for the kunit test. I haven't checked the last
patch.

-- 
Catalin