From: David Hildenbrand <david@redhat.com>
To: Yeoreum Yun <yeoreum.yun@arm.com>,
catalin.marinas@arm.com, will@kernel.org, broonie@kernel.org,
anshuman.khandual@arm.com, joey.gouly@arm.com, maz@kernel.org,
oliver.upton@linux.dev, frederic@kernel.org, james.morse@arm.com,
hardevsinh.palaniya@siliconsignals.io,
shameerali.kolothum.thodi@huawei.com, huangxiaojia2@huawei.com,
mark.rutland@arm.com, samuel.holland@sifive.com,
palmer@rivosinc.com, charlie@rivosinc.com,
thiago.bauermann@linaro.org, bgray@linux.ibm.com,
tglx@linutronix.de, puranjay@kernel.org,
yang@os.amperecomputing.com, mbenes@suse.cz,
joel.granados@kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, nd@arm.com
Subject: Re: [PATCH v3 2/4] prtcl: introduce PR_MTE_STORE_ONLY
Date: Thu, 24 Apr 2025 22:34:57 +0200 [thread overview]
Message-ID: <390f3d5e-8da6-4286-b8a9-72eabcc3abd5@redhat.com> (raw)
In-Reply-To: <20250410080723.953525-3-yeoreum.yun@arm.com>
On 10.04.25 10:07, Yeoreum Yun wrote:
> PR_MTE_STORE_ONLY is used to restrict the MTE tag check for store
> opeartion only.
>
> Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com>
> ---
> include/uapi/linux/prctl.h | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/include/uapi/linux/prctl.h b/include/uapi/linux/prctl.h
> index 15c18ef4eb11..83ac566251d8 100644
> --- a/include/uapi/linux/prctl.h
> +++ b/include/uapi/linux/prctl.h
> @@ -244,6 +244,8 @@ struct prctl_mm_map {
> # define PR_MTE_TAG_MASK (0xffffUL << PR_MTE_TAG_SHIFT)
> /* Unused; kept only for source compatibility */
> # define PR_MTE_TCF_SHIFT 1
> +/* MTE tag check store only */
> +# define PR_MTE_STORE_ONLY (1UL << 19)
That is the next available bit after PR_MTE_TAG_MASK, correct?
Would we want to leave some space to grow PR_MTE_TAG_MASK in the future
(could that happen?)?
--
Cheers,
David / dhildenb
next prev parent reply other threads:[~2025-04-24 20:35 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-10 8:07 [PATCH v3 0/4] support FEAT_MTE_STORE_ONLY feature Yeoreum Yun
2025-04-10 8:07 ` [PATCH v3 1/4] arm64/feature: add MTE_STORE_ONLY feature Yeoreum Yun
2025-05-02 17:24 ` Catalin Marinas
2025-05-07 10:48 ` Yeoreum Yun
2025-04-10 8:07 ` [PATCH v3 2/4] prtcl: introduce PR_MTE_STORE_ONLY Yeoreum Yun
2025-04-24 20:34 ` David Hildenbrand [this message]
2025-04-28 15:46 ` Yeo Reum Yun
2025-05-02 17:37 ` Catalin Marinas
2025-05-02 18:03 ` Peter Collingbourne
2025-05-02 20:19 ` Catalin Marinas
2025-04-10 8:07 ` [PATCH v3 3/4] arm64/kernel: support store-only mte tag check Yeoreum Yun
2025-05-02 17:50 ` Catalin Marinas
2025-05-07 10:47 ` Yeoreum Yun
2025-04-10 8:07 ` [PATCH v3 4/4] tools/kselftest: add MTE_STORE_ONLY feature hwcap test Yeoreum Yun
2025-05-02 17:51 ` Catalin Marinas
2025-05-07 10:49 ` Yeoreum Yun
2025-04-24 13:50 ` [PATCH v3 0/4] support FEAT_MTE_STORE_ONLY feature Yeoreum Yun
2025-04-24 20:29 ` David Hildenbrand
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