linux-kernel - Re: 2.6.32-rc5-git3 compile problems

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Date:	Tue, 27 Oct 2009 23:37:37 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Xiaotian Feng <xtfeng@...il.com>
Cc:	Alex <mysqlstudent@...il.com>, lkml <linux-kernel@...r.kernel.org>
Subject: Re: 2.6.32-rc5-git3 compile problems

On Wed, Oct 28, 2009 at 11:07:13AM +0800, Xiaotian Feng wrote:
> Try this patch, thanks.
> ---
> index b40ac57..04a4272 100644
> --- a/kernel/rcutree.h
> +++ b/kernel/rcutree.h
> @@ -292,8 +292,24 @@ DECLARE_PER_CPU(struct rcu_data, rcu_preempt_data);
> 
>  #else /* #ifdef RCU_TREE_NONCORE */
> 
> -/* Forward declarations for rcutree_plugin.h */
> -static inline void rcu_bootup_announce(void);
> +#ifdef CONFIG_TREE_PREEMPT_RCU
> +/*
> + * Tell them what RCU they are running.
> + */
> +static inline void rcu_bootup_announce(void)
> +{
> +        printk(KERN_INFO
> +               "Experimental preemptable hierarchical RCU implementation.\n");
> +}
> +#else
> +/*
> + * Tell them what RCU they are running.
> + */
> +static inline void rcu_bootup_announce(void)
> +{
> +        printk(KERN_INFO "Hierarchical RCU implementation.\n");
> +}
> +#endif
>  long rcu_batches_completed(void);
>  static void rcu_preempt_note_context_switch(int cpu);
>  static int rcu_preempted_readers(struct rcu_node *rnp);
> diff --git a/kernel/rcutree_plugin.h b/kernel/rcutree_plugin.h
> index c0cb783..1b96445 100644
> --- a/kernel/rcutree_plugin.h
> +++ b/kernel/rcutree_plugin.h
> @@ -31,15 +31,6 @@ struct rcu_state rcu_preempt_state =
> RCU_STATE_INITIALIZER(rcu_preempt_state);
>  DEFINE_PER_CPU(struct rcu_data, rcu_preempt_data);
> 
>  /*
> - * Tell them what RCU they are running.
> - */
> -static inline void rcu_bootup_announce(void)

Given that this is anything but performance-critical, could we instead
remove the "inline" above and on the forward declaration, possibly
also marking as __init?

Or am I misunderstanding the problem?

							Thanx, Paul

> -{
> -       printk(KERN_INFO
> -              "Experimental preemptable hierarchical RCU implementation.\n");
> -}
> -
> -/*
>   * Return the number of RCU-preempt batches processed thus far
>   * for debug and statistics.
>   */
> @@ -462,14 +453,6 @@ void exit_rcu(void)
>  #else /* #ifdef CONFIG_TREE_PREEMPT_RCU */
> 
>  /*
> - * Tell them what RCU they are running.
> - */
> -static inline void rcu_bootup_announce(void)
> -{
> -       printk(KERN_INFO "Hierarchical RCU implementation.\n");
> -}
> -
> -/*
>   * Return the number of RCU batches processed thus far for debug & stats.
>   */
>  long rcu_batches_completed(void)
> 
> On Wed, Oct 28, 2009 at 4:50 AM, Alex <mysqlstudent@...il.com> wrote:
> > Hi,
> >
> > I receive the following error when using defconfig on 2.6.32-rc5-git3:
> >
> >  CC      kernel/seccomp.o
> >  CC      kernel/rcutree.o
> > kernel/rcutree.c: In function `__rcu_init':
> > kernel/rcutree.h:296: sorry, unimplemented: inlining failed in call to
> > 'rcu_bootup_announce': function body not available
> > kernel/rcutree.c:1702: sorry, unimplemented: called from here
> > make[1]: *** [kernel/rcutree.o] Error 1
> > make: *** [kernel] Error 2
> >
> > Is this something I'm doing wrong? I'm actually trying to compile
> > 2.6.31.5 with the default config, and it too fails, for another
> > reason. I'm having difficulty compiling 2.6.31 and 2.6.31.5 on x86
> > with gcc-3.4.4 and binutils-2.20.51.0.2. I'm also using glibc-2.3.6.
> >
> >  AS      arch/x86/lib/thunk_32.o
> >  CC      arch/x86/lib/usercopy_32.o
> >  AR      arch/x86/lib/lib.a
> >  LD      vmlinux.o
> >  MODPOST vmlinux.o
> >  GEN     .version
> >  CHK     include/linux/compile.h
> >  UPD     include/linux/compile.h
> >  CC      init/version.o
> >  LD      init/built-in.o
> >  LD      .tmp_vmlinux1
> > drivers/built-in.o: In function `con_init':
> > vt.c:(.init.text+0x3c5b): undefined reference to `.L1446'
> > make: *** [.tmp_vmlinux1] Error 1
> >
> > I'd sure appreciate any pointers on how to troubleshoot this.
> >
> > Thanks,
> > Alex
> > --
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