linux-kernel - Re: next-20240712: task_work.c:(.text+0xc2): undefined reference to `irq_work

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Message-Id: <e25a690e-6cb9-4e00-ac1d-07cda43b12de@app.fastmail.com>
Date: Fri, 12 Jul 2024 14:28:38 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Naresh Kamboju" <naresh.kamboju@...aro.org>,
 "open list" <linux-kernel@...r.kernel.org>, lkft-triage@...ts.linaro.org,
 "Linux Regressions" <regressions@...ts.linux.dev>
Cc: "Dan Carpenter" <dan.carpenter@...aro.org>,
 "Anders Roxell" <anders.roxell@...aro.org>,
 "Sebastian Andrzej Siewior" <bigeasy@...utronix.de>,
 "Peter Zijlstra" <peterz@...radead.org>
Subject: Re: next-20240712: task_work.c:(.text+0xc2): undefined reference to
 `irq_work_queue'

On Fri, Jul 12, 2024, at 14:13, Naresh Kamboju wrote:
> The 32-bit arm, mips and powerpc the tinyconfig builds failed on today's
> Linux next-20240712 tag with gcc and clang builds.
> The defconfig builds pass.
>
>   GOOD: next-20240711
>   BAD:  next-20240712
>
> Build error:
> ------
> arm-linux-gnueabihf-ld: kernel/task_work.o: in function `task_work_add':
> task_work.c:(.text+0xc2): undefined reference to `irq_work_queue'
>
> Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

The call to this function was added in 466e4d801cd4 ("task_work:
Add TWA_NMI_CURRENT as an additional notify mode.").  It's possible
that we may have to always enable IRQ_WORK even on non-SMP
kernels now. In practice it is already enabled in most
configurations for one reason or another, the the cost is
likely very small.

Otherwise checking for CONFIG_HAVE_NMI in the new code might work.

     Arnd