Re: v2.6.26-rc7: BUG: unable to handle kernel NULL pointer dereference

On Monday 23 June 2008 02:29:07 Vegard Nossum wrote:
And the (cpu < nr_cpu_ids) fails because the CPU has just been
offlined (or failed to initialize, but it's the same thing), while
NR_CPUS is the value that was compiled in as CONFIG_NR_CPUS (so the
former check will always be true).

I don't think it is valid to ask for a per_cpu() variable on a CPU
which does not exist, though

Yes it is. As long as cpu_possible(cpu), per_cpu(cpu) is valid.

The number check should be removed: checking cpu_possible() is sufficient.

Hope that helps,
Rusty.
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