Messages in this thread | | | Subject | Re: Kexec, DMA, and SMP | From | Stephen Hemminger <> | Date | 11 Feb 2003 09:09:10 -0800 |
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On Mon, 2003-02-10 at 21:08, Eric W. Biederman wrote: > Kenneth Sumrall <ken@mvista.com> writes: > > > > Suparna Bhattacharya <suparna@in.ibm.com> writes: > > > > Agreed. I guess the primary question is can we trust the current > > > device shutdown + reboot notifier path or do we need to make some > > > large changes to avoid it. > > > > > So are the functions registered on the reboot notifier path guaranteed > > to be non-blocking? In the kexec on panic case, calls that can block > > would obviously be a bad thing. If they can block, perhaps we could add > > a new flag SYS_PANIC or something like that to tell the driver to only > > do a non-blocking shutdown of the chip. > Some of the network shutdown reboot notifiers can block. I found this out the hard way when trying to convert notifiers to use RCU and discovered many warnings. So many that the effort was abandoned.
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