Hi, I've seen this failure on tag next-20210202: arch/arm64/kernel/mte.c:121:15: error: 'mte_enable_kernel_sync' undeclared here (not in a function); did you mean 'mte_enable_kernel'? I think it may be a merge conflict that didn't get resolved correctly? The below change fixed the issue: diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c index 275b5d0f38b8..8f5bd1293496 100644 --- a/arch/arm64/kernel/mte.c +++ b/arch/arm64/kernel/mte.c @@ -118,7 +118,7 @@ void mte_set_report_once(bool state) { WRITE_ONCE(report_fault_once, state); } -EXPORT_SYMBOL(mte_enable_kernel_sync); +EXPORT_SYMBOL(mte_enable_kernel); EXPORT_SYMBOL(mte_set_report_once); bool mte_report_once(void) Cheers, Anders