lockdep warning while booting POWER9 PowerNV

[Bart Van Assche]

On 8/30/19 2:13 PM, Qian Cai wrote:
> https://raw.githubusercontent.com/cailca/linux-mm/master/powerpc.config
> 
> Once in a while, booting an IBM POWER9 PowerNV system (8335-GTH) would generate
> a warning in lockdep_register_key() at,
> 
> if (WARN_ON_ONCE(static_obj(key)))
> 
> because
> 
> key = 0xc0000000019ad118
> &_stext = 0xc000000000000000
> &_end = 0xc0000000049d0000
> 
> i.e., it will cause static_obj() returns 1.

(back from a trip)

Hi Qian,

Does this mean that on POWER9 it can happen that a dynamically allocated 
object has an address that falls between &_stext and &_end? Since I am 
not familiar with POWER9 nor have access to such a system, can you 
propose a patch?

Thanks,

Bart.