linux-kernel - Re: Build error on kernel/rcutree.c

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Message-ID: <20130113181245.GK3384@linux.vnet.ibm.com>
Date:	Sun, 13 Jan 2013 10:12:45 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Fabio Estevam <festevam@...il.com>
Cc:	paul.mckenney@...aro.org, linux-arm-kernel@...ts.infradead.org,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Build error on kernel/rcutree.c

On Sun, Jan 13, 2013 at 04:03:24PM -0200, Fabio Estevam wrote:
> Hi Paul,
> 
> When building ARM imx_v4_v5_defconfig the following error shows up on
> linux-next 20130111:
> 
> kernel/rcutree.c:808:2: error: implicit declaration of function
> 'rcu_jiffies_till_stall_check' [-Werror=implicit-function-declaration]
> kernel/rcutree.c:941:6: error: 'rcu_cpu_stall_suppress' undeclared
> (first use in this function)
> 
> Is this a known issue?

Yes, the fix is in -rcu and should make it to -next soon.

In the meantime, you can work around the problem by avoiding selecting
CONFIG_TREE_PREEMPT_RCU=y on SMP=n builds -- use CONFIG_TINY_PREEMPT_RCU
instead.

							Thanx, Paul

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