On Wed, 22 Jul 2020 06:30:53 +0200 Joerg Vehlow <l...@jv-coder.de> wrote:
> >> About 12 years ago this was not implemented using a mutex, but using xchg. > >> See: 8c5a1cf0ad3ac5fcdf51314a63b16a440870f6a2 > > Yes, that commit is wrong, because mutex_trylock() is not to be taken in > > interrupt context, where crash_kexec() looks like it can be called. Yup, mutex_trylock() from interrupt is improper. Well dang, that's a bit silly. Presumably the 2006 spin_lock_mutex() wasn't taken with irqs-off. Ho hum, did you look at switching the kexec code back to the xchg approach?
