Dear Domke : >>Does CRIT_EXCEPTION work? Is do_IRQ reentrant? Should i use the same >>interrupt processing as a normal hardware interrupt, with the exception >>that only "critical"-flagged interrupts are processed? >> >>Any suggestions? >> >> As far as I know, critical interrupt in ppc4xx archetecture is handled as a kind of unknown Interrupts. So It make system down in 2.6 series (this may also be true in 2.4).
In linux kernel , the kernel stack is changed to critical interrupt stack instead of user process's kernel stack when it occuers in super visor mode. So do_IRQ can not be called in crittical interrupt(because it call preempt relevant functions). We have implemeted critical interrupt handling facilites in 2.6 kernel . In this implementation, critical interrupt specific interrupt handling routines. If you need our patch, please contact me(cause we need some periods to prepare the patch). Regards, -- Takeharu KATO Fujitsu Limited Email:tkato at cs.fujitsu.co.jp (ext. 7112-4621) ** Sent via the linuxppc-embedded mail list. See http://lists.linuxppc.org/
