Re: [PATCH v2] powerpc/xive: Do not skip CPU-less nodes when creating the IPIs

On Sat, 7 Aug 2021 09:20:57 +0200, Cédric Le Goater wrote:

On PowerVM, CPU-less nodes can be populated with hot-plugged CPUs at
runtime. Today, the IPI is not created for such nodes, and hot-plugged
CPUs use a bogus IPI, which leads to soft lockups.

We can not directly allocate and request the IPI on demand because
bringup_up() is called under the IRQ sparse lock. The alternative is
to allocate the IPIs for all possible nodes at startup and to request
the mapping on demand when the first CPU of a node is brought up.

Applied to powerpc/fixes.

[1/1] powerpc/xive: Do not skip CPU-less nodes when creating the IPIs
      https://git.kernel.org/powerpc/c/cbc06f051c524dcfe52ef0d1f30647828e226d30

cheers