linux-kernel - Re: update.c:undefined reference to `irq_work

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Message-ID: <20201222050305.GA2657@paulmck-ThinkPad-P72>
Date:   Mon, 21 Dec 2020 21:03:05 -0800
From:   "Paul E. McKenney" <paulmck@...nel.org>
To:     kernel test robot <lkp@...el.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: Re: update.c:undefined reference to `irq_work_queue'

On Tue, Dec 22, 2020 at 11:24:22AM +0800, kernel test robot wrote:
> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   8653b778e454a7708847aeafe689bce07aeeb94e
> commit: b38f57c1fe64276773b124dffb0a139cc32ab3cb rcu-tasks: Allow rcu_read_unlock_trace() under scheduler locks
> date:   8 months ago
> config: h8300-randconfig-s032-20201220 (attached as .config)
> compiler: h8300-linux-gcc (GCC) 9.3.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # apt-get install sparse
>         # sparse version: v0.6.3-184-g1b896707-dirty
>         # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b38f57c1fe64276773b124dffb0a139cc32ab3cb
>         git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>         git fetch --no-tags linus master
>         git checkout b38f57c1fe64276773b124dffb0a139cc32ab3cb
>         # save the attached .config to linux build tree
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' ARCH=h8300 
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
> 
> All errors (new ones prefixed by >>):
> 
>    h8300-linux-ld: section .init.text LMA [000000000043a160,0000000000452569] overlaps section .rodata LMA [00000000003ff420,000000000047df2f]
>    h8300-linux-ld: section .data VMA [0000000000400000,000000000043a15f] overlaps section .rodata VMA [00000000003ff420,000000000047df2f]
>    h8300-linux-ld: section __ksymtab VMA [000000000047df30,000000000048611f] overlaps section .bss VMA [000000000045ebd0,000000000056a053]
>    h8300-linux-ld: kernel/rcu/update.o: in function `rcu_read_unlock_trace_special':
> >> update.c:(.text+0x8f9): undefined reference to `irq_work_queue'

Does the patch below help?

							Thanx, Paul

------------------------------------------------------------------------

commit cb7220ed05190c9a92df95b52a21525a7e08a449
Author: Paul E. McKenney <paulmck@...nel.org>
Date:   Mon Dec 21 21:00:18 2020 -0800

    rcu: Make TASKS_TRACE_RCU select IRQ_WORK
    
    Tasks Trace RCU uses irq_work_queue() to safely awaken its grace-period
    kthread, so this commit therefore causes the TASKS_TRACE_RCU Kconfig
    option select the IRQ_WORK Kconfig option.
    
    Reported-by: kernel test robot <lkp@...el.com>
    Signed-off-by: Paul E. McKenney <paulmck@...nel.org>

diff --git a/kernel/rcu/Kconfig b/kernel/rcu/Kconfig
index aa8cc8c9..3128b7c 100644
--- a/kernel/rcu/Kconfig
+++ b/kernel/rcu/Kconfig
@@ -95,6 +95,7 @@ config TASKS_RUDE_RCU
 
 config TASKS_TRACE_RCU
 	def_bool 0
+	select IRQ_WORK
 	help
 	  This option enables a task-based RCU implementation that uses
 	  explicit rcu_read_lock_trace() read-side markers, and allows