linux-kernel - Re: [PATCH] cpumask: provide a dummy cpumask_next

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Date:   Mon, 13 Aug 2018 15:01:48 -0700
From:   Caleb Raitto <caraitto@...gle.com>
To:     arnd@...db.de
Cc:     akpm@...ux-foundation.org, peterz@...radead.org,
        Willem de Bruijn <willemb@...gle.com>, davem@...emloft.net,
        adobriyan@...il.com, mingo@...nel.org, rakib.mullick@...il.com,
        amritha.nambiar@...el.com, mhkelley@...look.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] cpumask: provide a dummy cpumask_next_wrap

On Mon, Aug 13, 2018 at 2:55 PM Arnd Bergmann <arnd@...db.de> wrote:
>
> The virtio_net driver has become the first one to call cpumask_next_wrap()
> even if CONFIG_SMP is disabled, leading to a build error:
>
> drivers/net/virtio_net.c: In function 'virtnet_set_affinity':
> drivers/net/virtio_net.c:1916:10: error: implicit declaration of function 'cpumask_next_wrap'; did you mean 'cpumask_next_and'? [-Werror=implicit-function-declaration]
>     cpu = cpumask_next_wrap(cpu, cpu_online_mask,
>
> Add a stub function along the lines of cpumask_first(), cpumask_next() etc.
> I'm not entirely sure what should be returned in this case, but at
> least for virtio_net, anything should work.

Sorry about the build break, I think this patch with a fix was already merged:

cpumask: make cpumask_next_wrap available without smp
https://patchwork.ozlabs.org/patch/956670/

Thanks,
-Caleb