Messages in this thread | | | Date | Mon, 30 Mar 1998 15:33:39 +0200 | From | Harald Koenig <> | Subject | Re: GGI and cli/sti in X |
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On Mar 29, Doug Ledford wrote:
> > Actually, it is bug in both X and kernel (well, locking up is X > > problem, but lost keypresses are kernel's). > > Not really, if X does a hardware cli() and then never recovers from it, > there is nothing the kernel can do about lost keypresses or anything else. > When the interrupts are disabled like that, the kernel is essentially > saying "You are a trusted binary and I'm giving you access to instructions > that can bring the whole system down, USE THEM WITH CARE!" and in response > the X server is saying "OK, I'm disabling interrupts" and then something > goes wrong in the X server and those interrupts never get re-enabled. So, > the X server obviously ignored that "USE THEM WITH CARE!" part of its > permissions the kernel allowed it to have or else the hardware did > something the X server didn't expect and things went downhill from there.
you really should check the sources first. then you'd see that cli() is _used_with_care_ (and for almost all current cards it's never ever used).
Harald -- All SCSI disks will from now on ___ _____ be required to send an email notice 0--,| /OOOOOOO\ 24 hours prior to complete hardware failure! <_/ / /OOOOOOOOOOO\ \ \/OOOOOOOOOOOOOOO\ \ OOOOOOOOOOOOOOOOO|// Harald Koenig, \/\/\/\/\/\/\/\/\/ Inst.f.Theoret.Astrophysik // / \\ \ koenig@tat.physik.uni-tuebingen.de ^^^^^ ^^^^^
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