Re: next-20240712: task_work.c:(.text+0xc2): undefined reference to `irq_work_queue'

[Arnd Bergmann]

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@xxxxxxxxxx>

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