linux-kernel - Re: lockdep warning while booting POWER9 PowerNV

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Message-ID: <9b8b287a-4ae1-ca9b-cff1-6d93672b6893@acm.org>
Date:   Wed, 4 Sep 2019 09:09:09 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Qian Cai <cai@....pw>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org
Subject: Re: lockdep warning while booting POWER9 PowerNV

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.