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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 16 Aug 2025 11:05:36.2880 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9f81092d-79e0-4337-a6a0-08dddcb4d3e6 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: AM4PEPF00025F9C.EURPRD83.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM8PR08MB5617 Hi Catalin, > On Mon, Aug 11, 2025 at 05:36:31PM +0100, Yeoreum Yun wrote: > > @@ -3131,6 +3132,13 @@ static const struct arm64_cpu_capabilities arm64_features[] = { > > .matches = has_cpuid_feature, > > ARM64_CPUID_FIELDS(ID_AA64PFR2_EL1, GCIE, IMP) > > }, > > + { > > + .desc = "Unprivileged Load Store Instructions (LSUI)", > > + .capability = ARM64_HAS_LSUI, > > + .type = ARM64_CPUCAP_SYSTEM_FEATURE, > > + .matches = has_cpuid_feature, > > + ARM64_CPUID_FIELDS(ID_AA64ISAR3_EL1, LSUI, IMP) > > + }, > > {}, > > }; > > Since this is only used in the kernel, I wonder whether we should hide > it behind #ifdef CONFIG_AS_HAS_LSUI. Otherwise we report it as present > and one may infer that the kernel is going to use it. Not a strong view > and I don't think we have a precedent for this. Agree, anyway if CONFIG_AS_HAS_LSUI, it'll be not used anywhere right now though kernel report it has this feature. I'll wrap it as your suggestion. Thanks. -- Sincerely, Yeoreum Yun