From: Yeoreum Yun <yeoreum.yun@arm.com>
To: Mark Brown <broonie@kernel.org>
Cc: Will Deacon <will@kernel.org>,
catalin.marinas@arm.com, maz@kernel.org, oliver.upton@linux.dev,
miko.lenczewski@arm.com, kevin.brodsky@arm.com, ardb@kernel.org,
suzuki.poulose@arm.com, lpieralisi@kernel.org,
yangyicong@hisilicon.com, scott@os.amperecomputing.com,
joey.gouly@arm.com, yuzenghui@huawei.com, pbonzini@redhat.com,
shuah@kernel.org, mark.rutland@arm.com, arnd@arndb.de,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev,
kvm@vger.kernel.org, linux-kselftest@vger.kernel.org
Subject: Re: [PATCH v11 RESEND 4/9] arm64: Kconfig: Detect toolchain support for LSUI
Date: Tue, 20 Jan 2026 11:35:52 +0000 [thread overview]
Message-ID: <aW9omBgyHyI4267b@e129823.arm.com> (raw)
In-Reply-To: <20a2e113-7d53-4857-9cbb-9e4ea910b7d0@sirena.org.uk>
> On Mon, Jan 19, 2026 at 03:50:43PM +0000, Will Deacon wrote:
> > On Sun, Dec 14, 2025 at 11:22:43AM +0000, Yeoreum Yun wrote:
>
> > > +config AS_HAS_LSUI
> > > + def_bool $(as-instr,.arch_extension lsui)
> > > + help
> > > + Supported by LLVM 20+ and binutils 2.45+.
>
> > This is an internal Kconfig variable so please drop the help text.
>
> It would be useful to keep the information about supported compilers as
> a comment though (as is done for some of the other toolchain feature
> tests).
With some comments from other thread,
What about this?
+menu "ARMv9.6 architectural features"
+
+config ARM64_LSUI
+ bool "Support Unprivileged Load Store Instructions (LSUI)"
+ default y
+ depends on AS_HAS_LSUI && !CPU_BIG_ENDIAN
+ help
+ The Unprivileged Load Store Instructions (LSUI) provides
+ variants load/store instructions that access user-space memory
+ from the kernel without clearing PSTATE.PAN bit.
+
+ This feature is supported by LLVM 20+ and binutils 2.45+.
+
+endmenu # "ARMv9.6 architectural feature"
+
config AS_HAS_LSUI
def_bool $(as-instr,.arch_extension lsui)
- help
- Supported by LLVM 20+ and binutils 2.45+.
--
Sincerely,
Yeoreum Yun
next prev parent reply other threads:[~2026-01-20 11:37 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-12-14 11:22 [PATCH v11 RESEND 0/9] support FEAT_LSUI Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 1/9] arm64: cpufeature: add FEAT_LSUI Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 2/9] KVM: arm64: expose FEAT_LSUI to guest Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 3/9] KVM: arm64: kselftest: set_id_regs: add test for FEAT_LSUI Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 4/9] arm64: Kconfig: Detect toolchain support for LSUI Yeoreum Yun
2026-01-19 15:50 ` Will Deacon
2026-01-19 15:54 ` Mark Brown
2026-01-20 11:35 ` Yeoreum Yun [this message]
2025-12-14 11:22 ` [PATCH v11 RESEND 5/9] arm64: futex: refactor futex atomic operation Yeoreum Yun
2026-01-19 15:57 ` Will Deacon
2026-01-19 22:19 ` Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 6/9] arm64: futex: support futex with FEAT_LSUI Yeoreum Yun
2026-01-19 16:37 ` Will Deacon
2026-01-19 22:17 ` Yeoreum Yun
2026-01-20 15:44 ` Yeoreum Yun
2026-01-21 13:48 ` Will Deacon
2026-01-21 14:16 ` Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 7/9] arm64: separate common LSUI definitions into lsui.h Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 8/9] arm64: armv8_deprecated: convert user_swpX to inline function Yeoreum Yun
2025-12-14 11:22 ` [PATCH v11 RESEND 9/9] arm64: armv8_deprecated: apply FEAT_LSUI for swpX emulation Yeoreum Yun
2025-12-15 9:33 ` Marc Zyngier
2025-12-15 9:56 ` Yeoreum Yun
2026-01-19 15:34 ` Will Deacon
2026-01-19 22:32 ` Yeoreum Yun
2026-01-20 9:32 ` Yeoreum Yun
2026-01-20 9:46 ` Mark Rutland
2026-01-20 10:07 ` Yeoreum Yun
2026-01-20 11:50 ` Will Deacon
2026-01-20 12:14 ` Yeoreum Yun
2026-01-20 17:59 ` Yeoreum Yun
2026-01-21 13:56 ` Will Deacon
2026-01-21 14:51 ` Yeoreum Yun
2026-01-21 16:20 ` Will Deacon
2026-01-21 16:31 ` Yeoreum Yun
2026-01-21 16:36 ` Will Deacon
2026-01-21 16:51 ` Yeoreum Yun
2025-12-31 10:07 ` [PATCH v11 RESEND 0/9] support FEAT_LSUI Yeoreum Yun
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