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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 22 Jul 2025 08:18:10.8009 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 6985cd61-a1b9-4ea9-13ba-08ddc8f84bff 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: AM4PEPF00025F96.EURPRD83.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB6530 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250722_011819_976728_83413D88 X-CRM114-Status: GOOD ( 20.95 ) 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 Mark, > On Mon, Jul 21, 2025 at 09:36:14AM +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 LUSI uses > > Nit: s/LUSI/LSUI/ > > > indiviual `.arch_extension` entries. > > Nit: s/indiviual/individual/ Sorry. I'll change it... > > Signed-off-by: Yeoreum Yun > > --- > > arch/arm64/Kconfig | 9 +++++++++ > > 1 file changed, 9 insertions(+) > > > > diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig > > index 393d71124f5d..c0beb44ed5b8 100644 > > --- a/arch/arm64/Kconfig > > +++ b/arch/arm64/Kconfig > > @@ -2238,6 +2238,15 @@ config ARM64_GCS > > > > endmenu # "v9.4 architectural features" > > > > +config AS_HAS_LSUI > > + def_bool $(as-instr,.arch_extension lsui) > > + help > > + Unprivileged Load Store is an extension to introduce unprivileged > > + variants of load and store instructions so that clearing PSTATE.PAN > > + is never required in privileged mode. > > + This feature is available with clang version 20 and later and not yet > > + supported by gcc. > > I don't think we need to describe the feature in detail for the AS_HAS_* > config symbol; I think all we need to say is: > > Supported by LLVM 20 and later, not yet supported by GNU AS. > Okay. I'll change it. > Otherwise this looks fine. Thanks! [...] -- Sincerely, Yeoreum Yun