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: <20170728124328.GC3730@linux.vnet.ibm.com>
Date:   Fri, 28 Jul 2017 05:43:28 -0700
From:   "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:     Fengguang Wu <fengguang.wu@...el.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.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 05:42:16PM +0800, Fengguang Wu wrote:
> 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

Thank you all for chasing this down!

							Thanx, Paul