linux-kernel - Re: [kbuild-all] [rcu:rcu/next 4/4] frv-linux-ld: Warning: size of symbol `sys_membarrier' changed from 8 in kernel/sys

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Message-ID: <20170728094216.p3ywnq6iibuce7kv@wfg-t540p.sh.intel.com>
Date:   Fri, 28 Jul 2017 17:42:16 +0800
From:   Fengguang Wu <fengguang.wu@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, kbuild-all@...org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [kbuild-all] [rcu:rcu/next 4/4] frv-linux-ld: Warning: size of
 symbol `sys_membarrier' changed from 8 in kernel/sys_ni.o to 44 in
 kernel/sched/membarrier.o

On Fri, Jul 28, 2017 at 11:19:33AM +0200, Peter Zijlstra wrote:
>On Fri, Jul 28, 2017 at 12:46:40AM +0000, Mathieu Desnoyers wrote:
>
>> > This is a new one on me.  What do we do to fix it?
>
>Apparently (see below) the answer is, we ignore this.
>
>> I would suspect this might be caused by moving membarrier.c from kernel/
>> to kernel/sched/. Perhaps Peter knows ?
>
><peterz> dhowells: hey, I know you don't care about FRV anymore, but suppose the 0-day thing says things like:
><peterz> >>    frv-linux-ld: Warning: size of symbol `sys_setuid' changed from 272 in
><peterz> >>    kernel/sys.o to 8 in kernel/sys_ni.o
><peterz> dhowells: do you have any clue wth went wrong?
><dhowells> peterz: it's been saying that for a long time, but I've no idea why
><dhowells> didn't seem to stop it working
><dhowells> I suspect it might not be handing weak symbol elimination correctly or something
><peterz> fair enough, I'll ignore it then

OK, I'll teach the robot to ignore all such warnings:

        frv-linux-ld: Warning: size of symbol `sys_setuid' changed from 272 in kernel/sys.o to 8 in kernel/sys_ni.o

I'll use blacklist pattern:

        frv-linux-ld: Warning: size of symbol .* changed from

Thanks,
Fengguang