Re: [PATCH] Do not use cpu_to_node() to find an offlined cpu's node.

On Mon, 2012-10-08 at 10:59 +0800, Tang Chen wrote:
> If a cpu is offline, its nid will be set to -1, and cpu_to_node(cpu) will
> return -1. As a result, cpumask_of_node(nid) will return NULL. In this case,
> find_next_bit() in for_each_cpu will get a NULL pointer and cause panic.

Hurm,. this is new, right? Who is changing all these semantics without
auditing the tree and informing all affected people?