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

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Date:   Tue, 14 Dec 2021 08:35:14 +0100
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 14/12/2021 à 07:09, Christophe Leroy a écrit :
> 
> 
> 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.
> 

trace_selftest_startup_function_graph() calls register_ftrace_direct() 
which returns -ENOSUPP because powerpc doesn't select 
CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS.

Should TEST_DIRECT_TRAMP depend on CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS ?

Christophe