K 10
svn:author
V 7
bdragon
K 8
svn:date
V 27
2019-12-30T02:56:47.907261Z
K 7
svn:log
V 673
[PowerPC] Fix panic when attempting to handle an HMI from an idle thread

In IRC, sfs_ finally managed to get a good trace of a kernel panic that was
happening when attempting to use webengine.

As it turns out, we were using vtophys() from interrupt context on an idle
thread in opal_hmi_handler2().

Since this involves locking the kernel pmap on PPC64 at the moment, this
ended up tripping a KASSERT in mtx_lock(), which then caused a parallel
panic stampede.

So, avoid this by preallocating the flags variable and storing it in PCPU.

Fixes "panic: mtx_lock() by idle thread 0x... on sleep mutex kernelpmap".

Differential Revision:	https://reviews.freebsd.org/D22962

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