linux-kernel - Re: [RFC PATCH 3/3] objtool/mcount: Add powerpc specific functions

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Date:   Mon, 21 Mar 2022 09:59:17 +0100
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Michael Ellerman <mpe@...erman.id.au>,
        Sathvika Vasireddy <sv@...ux.ibm.com>
Cc:     "aik@...abs.ru" <aik@...abs.ru>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        Peter Zijlstra <peterz@...radead.org>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "naveen.n.rao@...ux.vnet.ibm.com" <naveen.n.rao@...ux.vnet.ibm.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [RFC PATCH 3/3] objtool/mcount: Add powerpc specific functions



Le 21/03/2022 à 09:30, Christophe Leroy a écrit :
> 
> 
> Le 21/03/2022 à 08:56, Christophe Leroy a écrit :
>>
>>
>> Le 21/03/2022 à 03:27, Michael Ellerman a écrit :
>>> Christophe Leroy <christophe.leroy@...roup.eu> writes:
>>>> Le 18/03/2022 à 13:26, Peter Zijlstra a écrit :
>>>>> On Fri, Mar 18, 2022 at 04:21:40PM +0530, Sathvika Vasireddy wrote:
>>>>>> This patch adds powerpc specific functions required for
>>>>>> 'objtool mcount' to work, and enables mcount for ppc.
>>>>>
>>>>> I would love to see more objtool enablement for Power :-)
>>>>
>>>> I have not received this series and I can't see it on powerpc patchwork
>>>> either (https://patchwork.ozlabs.org/project/linuxppc-dev/list/)
>>>>
>>>> Did you send it to linuxppc-dev list ? If not can you resend it there ?
>>>
>>> It is there, might have been delayed?
>>>
>>> http://patchwork.ozlabs.org/project/linuxppc-dev/list/?series=291129
>>>
>>> There are some CI failures.
>>>
>>
>> On PPC32 I get :
>>
>> [    0.000000] ftrace: No functions to be traced?
>>
>> Without this series I get:
>>
>> [    0.000000] ftrace: allocating 22508 entries in 17 pages
>> [    0.000000] ftrace: allocated 17 pages with 2 groups
>>
>>
> 
> 
> ppc64_defconfig on QEMU:
> 
> [    0.000000][    T0] ftrace: No functions to be traced?
> 
> Without your series:
> 
> [    0.000000][    T0] ftrace: allocating 38750 entries in 15 pages
> [    0.000000][    T0] ftrace: allocated 15 pages with 4 groups
> [    0.000000][    T0] trace event string verifier disabled
> 

ppc64le_defconfig on QEMU:

[    0.000000][    T0] ftrace: allocating 37236 entries in 14 pages
[    0.000000][    T0] ftrace: allocated 14 pages with 3 groups

Without your series:

[    0.000000][    T0] ftrace: allocating 37236 entries in 14 pages
[    0.000000][    T0] ftrace: allocated 14 pages with 3 groups

So it seems it works only on Little Endian.
Works neither on PPC32 nor on PPC64 Big Endian

Christophe