linux-kernel - Re: linux-next: build failure after merge of the rcu tree

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Message-ID: <20200528163358.GK2869@paulmck-ThinkPad-P72>
Date:   Thu, 28 May 2020 09:33:59 -0700
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     Stephen Rothwell <sfr@...b.auug.org.au>
Cc:     Linux Next Mailing List <linux-next@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        "Joel Fernandes (Google)" <joel@...lfernandes.org>
Subject: Re: linux-next: build failure after merge of the rcu tree

On Thu, May 28, 2020 at 07:05:01PM +1000, Stephen Rothwell wrote:
> Hi all,
> 
> After merging the rcu tree, today's linux-next build (powercp
> allyesconfig) failed like this:
> 
> ld: kernel/rcu/refperf.o:(.discard+0x0): multiple definition of `__pcpu_unique_srcu_ctl_perf_srcu_data'; kernel/rcu/rcuperf.o:(.discard+0x0): first defined here
> 
> Caused by commit
> 
>   786a25497743 ("refperf: Add a test to measure performance of read-side synchronization")
> 
> From srcutree.h:
> 
>  * Note that although DEFINE_STATIC_SRCU() hides the name from other
>  * files, the per-CPU variable rules nevertheless require that the
>  * chosen name be globally unique.
> 
> I have applied the following patch for today.

I have a patch queued, but it is currently blocked by other broken
commits which I expect to have straightened out today.

Yet again, please accept my apologies for the hassle!

							Thanx, Paul

> From: Stephen Rothwell <sfr@...b.auug.org.au>
> Date: Thu, 28 May 2020 18:57:17 +1000
> Subject: [PATCH] refperf: uniqify name
> 
> Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
> ---
>  kernel/rcu/refperf.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/kernel/rcu/refperf.c b/kernel/rcu/refperf.c
> index 8c4a63257be9..47df72c492b3 100644
> --- a/kernel/rcu/refperf.c
> +++ b/kernel/rcu/refperf.c
> @@ -133,8 +133,8 @@ static struct ref_perf_ops rcu_ops = {
>  
>  
>  // Definitions for SRCU ref perf testing.
> -DEFINE_STATIC_SRCU(srcu_ctl_perf);
> -static struct srcu_struct *srcu_ctlp = &srcu_ctl_perf;
> +DEFINE_STATIC_SRCU(ref_srcu_ctl_perf);
> +static struct srcu_struct *srcu_ctlp = &ref_srcu_ctl_perf;
>  
>  static void srcu_ref_perf_read_section(int nloops)
>  {
> -- 
> 2.26.2
> 
> -- 
> Cheers,
> Stephen Rothwell