linux-kernel - RCU: undefined reference to irq_work

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Date:   Thu, 17 Mar 2022 11:32:53 +0000
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     rcu@...r.kernel.org
Cc:     "Paul E. McKenney" <paulmck@...nel.org>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Joel Fernandes <joel@...lfernandes.org>,
        Hyeonggon Yoo <42.hyeyoo@...il.com>,
        linux-kernel@...r.kernel.org
Subject: RCU: undefined reference to irq_work_queue

Hello RCU folks,

I like to use minimal configuration for kernel development.
when building with tinyconfig + CONFIG_PREEMPT=y on arm64:

ld: kernel/rcu/update.o: in function `call_rcu_tasks':
update.c:(.text+0xb2c): undefined reference to `irq_work_queue'
update.c:(.text+0xb2c): relocation truncated to fit: R_AARCH64_CALL26 against undefined symbol `irq_work_queue'
make: *** [Makefile:1155: vmlinux] Error 1

It seems RCU calls irq_work_queue() without checking if CONFIG_IRQ_WORK is enabled.

-- 
Thank you, You are awesome!
Hyeonggon :-)