On Tue, Aug 22, 2023 at 09:56:38AM +0800, Huang, Ying wrote: > > ERST is mainly used to log the hardware error. While, hardware error > may be reported via NMI (e.g., ACPI APEI GHES NMI), so we need to call > ERST functions in NMI handlers. Where normal spinlock cannot be used > because they will be converted to sleepable rt_mutex in RT kernel. Non-sleeping spinlocks cannot be used in NMI context either. raw_spin_lock_irqsave() will prevent regular interrupts, but not NMI. So taking a spinlock inside an NMI can trigger a deadlock. Am I missing something here? Jörn -- All art is but imitation of nature. -- Lucius Annaeus Seneca
