linux-kernel - Re: [RFC PATCH 2/4] objtool: Enable objtool to run only on files with ftrace enabled

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Date:   Tue, 24 May 2022 16:23:55 +0530
From:   Sathvika Vasireddy <sv@...ux.vnet.ibm.com>
To:     Christophe Leroy <christophe.leroy@...roup.eu>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "mbenes@...e.cz" <mbenes@...e.cz>, "aik@...abs.ru" <aik@...abs.ru>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "naveen.n.rao@...ux.vnet.ibm.com" <naveen.n.rao@...ux.vnet.ibm.com>,
        Sathvika Vasireddy <sv@...ux.ibm.com>
Subject: Re: [RFC PATCH 2/4] objtool: Enable objtool to run only on files with
 ftrace enabled

Hi Christophe,

On 24/05/22 14:27, Christophe Leroy wrote:
>
> Le 23/05/2022 à 19:55, Sathvika Vasireddy a écrit :
>> This patch makes sure objtool runs only on the object files
>> that have ftrace enabled, instead of running on all the object
>> files.
> Why do that ?
This was done to address the issue discussed here:
https://lore.kernel.org/all/b06bb9bc-22d1-acce-fe68-c7c4cb7c15b5@csgroup.eu/ 

>
> What about static_calls ? There may be files without ftrace but with
> static calls.
Yes, this prevents objtool from running on those files. We can
restrict this change to FTRACE_MCOUNT_USE_OBJTOOL
>
> By the way, it would be nice if we could use it only on C files.
> I get the following errors for ASM files:
>
> arch/powerpc/kernel/entry_32.o: warning: objtool: .text+0x1b4:
> unannotated intra-function call

I'm looking into ways to address this.

- Sathvika