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Message-Id: <20250403174701.74312-3-yeoreum.yun@arm.com>
Date: Thu,  3 Apr 2025 18:46:59 +0100
From: Yeoreum Yun <yeoreum.yun@....com>
To: catalin.marinas@....com,
	will@...nel.org,
	broonie@...nel.org,
	anshuman.khandual@....com,
	joey.gouly@....com,
	maz@...nel.org,
	oliver.upton@...ux.dev,
	frederic@...nel.org,
	james.morse@....com,
	hardevsinh.palaniya@...iconsignals.io,
	shameerali.kolothum.thodi@...wei.com,
	huangxiaojia2@...wei.com,
	mark.rutland@....com,
	samuel.holland@...ive.com,
	palmer@...osinc.com,
	charlie@...osinc.com,
	thiago.bauermann@...aro.org,
	bgray@...ux.ibm.com,
	tglx@...utronix.de,
	puranjay@...nel.org,
	david@...hat.com,
	yang@...amperecomputing.com,
	mbenes@...e.cz,
	joel.granados@...nel.org
Cc: linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	nd@....com,
	Yeoreum Yun <yeoreum.yun@....com>
Subject: [PATCH v2 2/4] prtcl: introduce PR_MTE_STORE_ONLY

PR_MTE_STORE_ONLY is used to restrict the MTE tag check for store
opeartion only.

Signed-off-by: Yeoreum Yun <yeoreum.yun@....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)
 /* RISC-V pointer masking tag length */
 # define PR_PMLEN_SHIFT			24
 # define PR_PMLEN_MASK			(0x7fUL << PR_PMLEN_SHIFT)
-- 
LEVI:{C3F47F37-75D8-414A-A8BA-3980EC8A46D7}


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