linux-kernel - Re: [PATCH v1 0/5] Implement livepatch on PPC32

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Date:   Tue, 14 Dec 2021 06:09:55 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Steven Rostedt <rostedt@...dmis.org>
CC:     Josh Poimboeuf <jpoimboe@...hat.com>,
        Jiri Kosina <jikos@...nel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Petr Mladek <pmladek@...e.com>,
        Joe Lawrence <joe.lawrence@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        "Naveen N . Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "live-patching@...r.kernel.org" <live-patching@...r.kernel.org>,
        "linux-s390@...r.kernel.org" <linux-s390@...r.kernel.org>
Subject: Re: [PATCH v1 0/5] Implement livepatch on PPC32



Le 13/12/2021 à 20:46, Steven Rostedt a écrit :
> On Mon, 13 Dec 2021 19:33:47 +0000
> Christophe Leroy <christophe.leroy@...roup.eu> wrote:
> 
>> STill the same Oops, below
> 
> Unfortunately, I don't have a PPC machine (32 nor 64 bit) to help debug
> this.
> 
> 
>> I will look more closely tomorrow.
> 
> OK, thanks.
> 

The Oops was due to ftrace_caller() setting the regs argument to NULL.

After fixing that, I'm back into a situation where I get "Testing tracer 
function_graph: FAILED!"

Will continue investigating.

Christophe