restart callback not supposed to sleep?

[Lothar Waßmann]

Hi,

Uwe Kleine-König writes:
> Hello,
> 
> while triggering a reboot via sysrq on an ARM machine I saw a "BUG:
> sleeping function called from invalid context" message (details below).
> The reason is that the sysrq handler is calling the restart hook in irq
> context. So what should be done about that? The obvious possiblities
> are:
> 
>  a) ignore the problem as it won't result in problems (and maybe somehow
>     silence the warnign); or
>  b) make the restart hook atomic; or
>  c) assert sysrq not calling the hook in atomic mode
> 
> What do you think?
> 
This has been discussed earlier (with your participation) with 'a)'
being the conclusion.
http://lists.infradead.org/pipermail/linux-arm-kernel/2010-December/033877.html


Lothar Waßmann
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