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[2003:cb:c74e:ff00:f734:227:6936:cdab]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3a073e5da0dsm252905f8f.88.2025.04.24.13.34.57 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 24 Apr 2025 13:34:58 -0700 (PDT) Message-ID: <390f3d5e-8da6-4286-b8a9-72eabcc3abd5@redhat.com> Date: Thu, 24 Apr 2025 22:34:57 +0200 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/4] prtcl: introduce PR_MTE_STORE_ONLY To: Yeoreum Yun , 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 References: <20250410080723.953525-1-yeoreum.yun@arm.com> <20250410080723.953525-3-yeoreum.yun@arm.com> From: David Hildenbrand Content-Language: en-US Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit 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 > --- > 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