From: Stephen Rothwell <sfr@canb.auug.org.au>
To: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
Cc: linux-next@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: linux-next: build failure after merge of the rcu tree
Date: Fri, 8 Jan 2016 07:19:32 +1100 [thread overview]
Message-ID: <20160108071932.060a9bcc@canb.auug.org.au> (raw)
In-Reply-To: <20160107180244.GR3818@linux.vnet.ibm.com>
Hi Paul,
On Thu, 7 Jan 2016 10:02:44 -0800 "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> wrote:
>
> On Thu, Jan 07, 2016 at 07:57:25PM +1100, Stephen Rothwell wrote:
> > Hi Paul,
> >
> > [I found this a few days ago, but I think I forgot to send the email,
> > sorry.]
> >
> > After merging the rcu tree, today's linux-next build (powerpc
> > allyesconfig) failed like this:
> >
> > kernel/rcu/rcuperf.o:(.discard+0x0): multiple definition of `__pcpu_unique_srcu_ctl_srcu_array'
> > kernel/rcu/rcutorture.o:(.discard+0x0): first defined here
> >
> > Caused by commit
> >
> > abcd7ec0808e ("rcutorture: Add RCU grace-period performance tests")
> >
> > I have reverted that commit for today.
>
> Hello, Stephen,
>
> Very strange. The "static" keyword does not mean anything here?
> Easy enough to use different symbols in the two different files,
> but this situation is not so good for information hiding.
>
> Happy to update rcuperf.c to use a different name, but in the
> immortal words of MSDOS, "Are you sure?" :-)
I have no idea why it happens, but I do get the error above unless I
revert that commit. So, yes, I am sure :-)
OK, I looked further and
DEFINE_STATIC_SRCU(srcu_ctl);
becomes this (NLs added for clarity):
static __attribute__((section(".discard"), unused)) char __pcpu_scope_srcu_ctl_srcu_array;
extern __attribute__((section(".discard"), unused)) char __pcpu_unique_srcu_ctl_srcu_array;
__attribute__((section(".discard"), unused)) char __pcpu_unique_srcu_ctl_srcu_array;
extern __attribute__((section(".data..percpu" ""))) __typeof__(struct srcu_struct_array) srcu_ctl_srcu_array;
__attribute__((section(".data..percpu" ""))) __attribute__((weak)) __typeof__(struct srcu_struct_array) srcu_ctl_srcu_array;
static struct srcu_struct srcu_ctl = {
.
.
};
So, the "static" is not very effective :-(
--
Cheers,
Stephen Rothwell sfr@canb.auug.org.au
next prev parent reply other threads:[~2016-01-07 20:19 UTC|newest]
Thread overview: 152+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-07 8:57 linux-next: build failure after merge of the rcu tree Stephen Rothwell
2016-01-07 18:02 ` Paul E. McKenney
2016-01-07 20:19 ` Stephen Rothwell [this message]
2016-01-07 20:52 ` Paul E. McKenney
2016-01-08 1:37 ` Boqun Feng
2016-01-08 3:41 ` Paul E. McKenney
2016-01-08 4:08 ` Stephen Rothwell
2016-01-08 4:48 ` Paul E. McKenney
2016-01-08 4:54 ` Boqun Feng
2016-01-08 15:53 ` Paul E. McKenney
2016-01-08 15:57 ` Tejun Heo
2016-01-08 16:18 ` Paul E. McKenney
2016-01-08 15:58 ` Boqun Feng
2016-01-08 4:10 ` Stephen Rothwell
-- strict thread matches above, loose matches on Subject: below --
2024-01-24 4:17 Stephen Rothwell
2024-01-24 9:49 ` Jiri Wiesner
2024-01-24 12:12 ` Paul E. McKenney
2024-01-24 13:31 ` Jiri Wiesner
2024-01-24 14:20 ` Paul E. McKenney
2023-07-27 4:19 Stephen Rothwell
2023-07-27 14:08 ` Paul E. McKenney
2023-05-19 0:59 Stephen Rothwell
2023-05-19 2:12 ` Paul E. McKenney
2023-05-22 1:45 ` Stephen Rothwell
2023-05-22 14:57 ` Paul E. McKenney
2023-03-14 1:29 Stephen Rothwell
2023-03-14 4:43 ` Paul E. McKenney
2022-10-17 23:26 Stephen Rothwell
2022-10-18 10:43 ` Frederic Weisbecker
2022-10-18 14:57 ` Paul E. McKenney
2022-04-19 2:36 Stephen Rothwell
2022-04-19 3:31 ` Paul E. McKenney
2021-05-03 0:11 Stephen Rothwell
2021-05-03 16:25 ` Paul E. McKenney
2021-04-22 4:10 Stephen Rothwell
2021-04-22 16:36 ` Paul E. McKenney
2021-03-17 5:36 Stephen Rothwell
2021-03-17 14:23 ` Paul E. McKenney
2021-01-04 0:37 Stephen Rothwell
2021-01-04 12:56 ` Frederic Weisbecker
2020-12-04 8:25 Stephen Rothwell
2020-12-04 19:20 ` Paul E. McKenney
2020-12-06 21:39 ` Stephen Rothwell
2020-12-07 4:48 ` Paul E. McKenney
2020-12-07 8:59 ` Stephen Rothwell
2020-09-17 5:19 Stephen Rothwell
2020-09-17 22:01 ` Paul E. McKenney
2020-09-18 0:00 ` Stephen Rothwell
2020-09-08 5:38 Stephen Rothwell
2020-09-08 13:54 ` Paul E. McKenney
2020-08-18 1:43 Stephen Rothwell
2020-08-18 14:08 ` Paul E. McKenney
2020-06-25 2:57 Stephen Rothwell
2020-06-25 3:45 ` Paul E. McKenney
2020-05-28 9:05 Stephen Rothwell
2020-05-28 16:33 ` Paul E. McKenney
2020-05-28 21:03 ` Paul E. McKenney
2020-04-05 1:49 Stephen Rothwell
2020-04-05 3:10 ` Paul E. McKenney
2020-01-17 3:07 Stephen Rothwell
2019-12-12 2:45 Stephen Rothwell
2019-12-12 4:07 ` Paul E. McKenney
2019-12-12 4:26 ` Stephen Rothwell
2019-12-12 4:41 ` Paul E. McKenney
2020-01-17 3:09 ` Stephen Rothwell
2019-08-13 7:57 Stephen Rothwell
2019-08-13 15:31 ` Paul E. McKenney
2019-08-12 6:12 Stephen Rothwell
2019-08-12 16:19 ` Paul E. McKenney
2019-08-13 5:25 ` Stephen Rothwell
2019-08-13 14:38 ` Paul E. McKenney
2017-09-04 4:50 Stephen Rothwell
2017-09-04 16:39 ` Paul E. McKenney
2017-08-28 4:25 Stephen Rothwell
2017-08-28 17:50 ` Paul E. McKenney
2017-08-11 4:43 Stephen Rothwell
2017-08-11 4:54 ` Paul E. McKenney
2017-08-11 9:14 ` Peter Zijlstra
2017-08-11 14:39 ` Paul E. McKenney
2017-08-11 14:45 ` Peter Zijlstra
2017-08-11 14:41 ` Peter Zijlstra
2017-08-11 20:12 ` Paul E. McKenney
2017-05-29 6:02 Stephen Rothwell
2017-05-29 21:15 ` Paul E. McKenney
2017-05-30 1:40 ` Stephen Rothwell
2017-05-30 1:54 ` Joe Perches
2017-05-30 2:14 ` Paul E. McKenney
2017-05-30 2:20 ` Joe Perches
2017-05-30 3:13 ` Stephen Rothwell
2017-05-30 4:10 ` Michael Ellerman
2017-06-02 17:51 ` Paul E. McKenney
2017-04-20 5:36 Stephen Rothwell
2017-04-20 14:23 ` Paul E. McKenney
2017-04-19 3:50 Stephen Rothwell
2017-04-19 4:06 ` Paul E. McKenney
2017-04-19 5:45 ` Stephen Rothwell
2017-03-08 1:16 Stephen Rothwell
2017-03-08 10:13 ` Daniel Vetter
2017-03-08 17:40 ` Paul E. McKenney
2017-01-19 3:34 Stephen Rothwell
2017-01-19 21:54 ` Paul McKenney
2017-02-13 2:21 ` Stephen Rothwell
2017-02-13 4:37 ` Paul E. McKenney
2017-02-13 6:43 ` Stephen Rothwell
2017-03-08 1:16 ` Stephen Rothwell
2017-03-08 1:37 ` Paul E. McKenney
2017-03-08 18:05 ` Paul E. McKenney
2016-05-02 4:37 Stephen Rothwell
2016-05-02 11:06 ` Paul E. McKenney
2016-02-01 2:55 Stephen Rothwell
2016-02-01 9:53 ` Paul E. McKenney
2015-09-01 3:50 Stephen Rothwell
2015-09-01 7:49 ` Paul E. McKenney
2015-09-02 3:58 ` Stephen Rothwell
2015-09-02 5:26 ` Paul E. McKenney
2015-09-02 6:40 ` Davidlohr Bueso
2015-09-02 7:14 ` Paul E. McKenney
2015-09-02 7:29 ` Ingo Molnar
2015-09-02 8:34 ` Paul E. McKenney
2015-07-16 3:14 Stephen Rothwell
2015-07-16 3:51 ` Paul E. McKenney
2015-07-16 5:50 ` Stephen Rothwell
2015-07-17 11:40 ` Ingo Molnar
2015-07-17 17:35 ` Paul E. McKenney
2015-07-17 18:53 ` Paul E. McKenney
2015-07-17 19:51 ` Ingo Molnar
2015-07-17 21:33 ` Paul E. McKenney
2015-07-18 2:40 ` Ingo Molnar
2015-04-13 10:39 Stephen Rothwell
2015-04-13 11:06 ` Borislav Petkov
2015-04-13 11:34 ` Ingo Molnar
2015-04-13 12:40 ` Paul E. McKenney
2015-02-27 2:18 Stephen Rothwell
2015-02-27 5:59 ` Paul E. McKenney
2014-12-26 7:51 Stephen Rothwell
2014-12-26 16:54 ` Paul E. McKenney
2014-12-27 16:24 ` Pranith Kumar
2014-12-27 17:20 ` Pranith Kumar
2014-12-31 1:45 ` Paul E. McKenney
2014-12-12 6:12 Stephen Rothwell
2014-12-12 17:23 ` Paul E. McKenney
2014-12-10 8:09 Stephen Rothwell
2014-12-10 15:03 ` Pranith Kumar
2014-12-10 15:18 ` Paul E. McKenney
2014-12-09 11:42 Stephen Rothwell
2014-12-09 14:07 ` Paul E. McKenney
2012-04-16 4:11 Stephen Rothwell
2012-04-16 17:02 ` Paul E. McKenney
2010-09-17 2:42 Stephen Rothwell
2010-09-17 4:39 ` David Miller
2010-09-17 5:34 ` Eric Dumazet
2010-09-17 23:17 ` Paul E. McKenney
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