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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: Gtp2a+BGMoOvZm9MApMTCSaUGHEEXA7/3St/dUggfk536G74EI3wi0R9OfcvG1CvaoqwtPc8iAQKOjTi3+aiTMjnAsd2hiVwZxEpvS2fWWhTgeiiY8sTjgL2NS2Z4upGENNbqPu9Dk1lenJ147zM4j8lWccV92EWeRaFVt14y8Nfot5Prkd1kBNOBrGiiOM2mvgt8dSSZpAGZa9s0rRPULldSd6TwCfCvG5vs//dDAKrMF8BqLn+u/6uJPDAiygtP9aMR+OHvr2waQT8gQR+xLF69Q111/Wq1chgjcB7ax6Qmb6f5gCemzXaf1DGEjFXJSbnaBVgIjSvwFx8k9rZPdnknIM/fdpN4OZWpfVwwE2vBlhE02DDz+QsiyAM9AXduw0BCu298IAUCk4ffPY/np0b1JlKlu3Mtm516HYi1KRvLGC2HFYkXPCz/LTDVO9w X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 07 Oct 2026 13:35:49.2278 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 5567bc22-b8a7-4be2-562b-08df2477e653 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: ZR1PEPF0000E45F.eurprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MI9PR08MB025303 On 9/29/26 18:35, Jonathan Cameron wrote: > On Tue, 29 Sep 2026 09:45:59 +0200 > Pierre Gondois wrote: > >> Add support for Memory Error Section 2 records. >> >> Extend cper_mem_err_compact to hold both legacy and section-2 records. >> Add a common parser and convert the CPER, GHES, EDAC, extlog and x86 APEI >> paths to use it. >> >> The extlog_mem_event payload layout changes with this series. >> Compatibility with existing userspace decoders still needs to be >> addressed. More specifically, the rasdaemon relies on the current >> struct cper_mem_err_compact definition. >> Either: >> A- >> this patchset should not modify struct cper_mem_err_compact and >> create a new structure to handle Memory Error Section 2 events, >> but this would ignore the similarities of Memory Error Section (1)/2 >> B- >> userspace should not rely on the struct cper_mem_err_compact >> layout. extlog_mem_event trace events should instead emit data >> that relies on the actual layout of the CPER records, as defined >> in the ACPI spec. >> >> I am looking for guidance on how to handle the above question. >> Current implementation lean toward B, but emits data in the trace >> event that maps the new/updated struct cper_mem_err_compact. > My initial thought is a no to modifying the usespace ABI. > > It isn't particularly painful to just have separate handling code > for the new record. Unfortunately the ext_log tracepoints don't > split out the fields in a fashion that would let you change > the structure. Other RAS tracepoints do it field by field which > would have been possible to augment - even then it would have > required care to deal with field size changes. > > It may be worth considering a much more 'expanded' tracepoint for > memory error section 2 to reduce similar future extension problems. > That is express ever field and don't use a compact structure at all. > > Mauro, perhaps you can give input on what works better over the > long term? > Just to be sure I understand correclty, this means that you would prefer to add a 'struct cper_mem_err2_compact'. All the functions currently using 'struct cper_mem_err_compact' or 'struct cper_sec_mem_err' as input/output parameter would have to be duplicated right ? E.g. arch_apei_report_mem_error(), cper_dimm_err_location(), ... Regards, Pierre