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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 15 Sep 2025 11:42:25.2854 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: b6cfbac9-580e-4bb3-e03f-08ddf44cf0f7 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d;Ip=[4.158.2.129];Helo=[outbound-uk1.az.dlp.m.darktrace.com] X-MS-Exchange-CrossTenant-AuthSource: DU2PEPF00028D13.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DBBPR08MB10819 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250915_044234_611761_5B71DAA0 X-CRM114-Status: GOOD ( 20.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Hi Will, > On Mon, Sep 15, 2025 at 11:42:12AM +0100, Yeoreum Yun wrote: > > > On Sat, Aug 16, 2025 at 04:19:26PM +0100, Yeoreum Yun wrote: > > > > Since Armv9.6, FEAT_LSUI supplies the load/store instructions for > > > > previleged level to access to access user memory without clearing > > > > PSTATE.PAN bit. > > > > It's enough to add CONFIG_AS_HAS_LSUI only because the code for LSUI uses > > > > individual `.arch_extension` entries. > > > > > > The subject could be improved slightly: Detect toolchain support for > > > LSUI. > > > > > > > > > > > Signed-off-by: Yeoreum Yun > > > > --- > > > > arch/arm64/Kconfig | 5 +++++ > > > > 1 file changed, 5 insertions(+) > > > > > > > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > > > > index e9bbfacc35a6..c474de3dce02 100644 > > > > --- a/arch/arm64/Kconfig > > > > +++ b/arch/arm64/Kconfig > > > > @@ -2239,6 +2239,11 @@ config ARM64_GCS > > > > > > > > endmenu # "v9.4 architectural features" > > > > > > > > +config AS_HAS_LSUI > > > > + def_bool $(as-instr,.arch_extension lsui) > > > > + help > > > > + Supported by LLVM 20 and later, not yet supported by GNU AS. > > > > > > binutils 2.45 added support for LSUI. > > > > > > Nitpick: we tend to add a two-space indentation from "help". > > > > > > Otherwise it looks fine: > > > > > > Reviewed-by: Catalin Marinas > > > > Thanks! I'll change the Nitpick and send again. > > Please don't resend until we've concluded on the CAS discussion. Yes. so I'm waiting for your comment for: - https://lore.kernel.org/all/aMfZI2VVV5zEsTna@e129823.arm.com/ - https://lore.kernel.org/all/aMfrR0vserl%2FhfZ3@e129823.arm.com/ Thanks. -- Sincerely, Yeoreum Yun