linux-kernel - Re: [RFC PATCH v3 11/12] powerpc: Remove unreachable() from WARN

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Date:   Mon, 4 Jul 2022 12:34:08 +0000
From:   Christophe Leroy <christophe.leroy@...roup.eu>
To:     Peter Zijlstra <peterz@...radead.org>
CC:     Sathvika Vasireddy <sv@...ux.vnet.ibm.com>,
        Sathvika Vasireddy <sv@...ux.ibm.com>,
        "linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
        "jpoimboe@...hat.com" <jpoimboe@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "aik@...abs.ru" <aik@...abs.ru>,
        "mpe@...erman.id.au" <mpe@...erman.id.au>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "rostedt@...dmis.org" <rostedt@...dmis.org>,
        "naveen.n.rao@...ux.vnet.ibm.com" <naveen.n.rao@...ux.vnet.ibm.com>,
        "mbenes@...e.cz" <mbenes@...e.cz>,
        "benh@...nel.crashing.org" <benh@...nel.crashing.org>,
        "paulus@...ba.org" <paulus@...ba.org>,
        Chen Zhongjin <chenzhongjin@...wei.com>,
        Marc Zyngier <maz@...nel.org>,
        Linux ARM <linux-arm-kernel@...ts.infradead.org>
Subject: Re: [RFC PATCH v3 11/12] powerpc: Remove unreachable() from WARN_ON()



Le 04/07/2022 à 13:45, Peter Zijlstra a écrit :
> On Wed, Jun 29, 2022 at 06:30:23PM +0000, Christophe Leroy wrote:
> 
> 
>> The problem is that that function has size 0:
>>
>> 00000000000003d0 l     F .text	0000000000000000
>> qdisc_root_sleeping_lock.part.0
> 
> I'm somewhat confused; how is an empty STT_FUNC a valid construct on
> Power?

So am I. It is likely not a valid construct, but that's what GCC seems 
to generate when you call annotate_unreachable().