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X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Nov 2025 15:57:39.1836 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: efd13ccd-4d17-4ec9-1d40-08de1e1660a7 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: DU2PEPF00028D0B.eurprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VE1PR08MB5632 Hi Arnd, > >> > apply FEAT_LSUI instruction to emulate deprecated swpX instruction. > >> > >> Can you explain in the changrelog why you do this? > >> > >> In particular, is this a performance optimization or is this required > >> for correctness in some scenario? > > > > I think the main purpose using for this is to "remove the toggling the > > PSTATE.PAN" bit. so that remove some *potential* problem which can > > happen when PAN bit is cleared. > > Ok, I see. This should definitely be part of the commit > log for the patch in addition to the cover letter. Thanks. I'll add detail in next spin after receving other comments. [...] -- Sincerely, Yeoreum Yun