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

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Date:   Mon, 13 Aug 2018 23:55:16 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Andrew Morton <akpm@...ux-foundation.org>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Caleb Raitto <caraitto@...gle.com>,
        Willem de Bruijn <willemb@...gle.com>,
        "David S . Miller" <davem@...emloft.net>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Rakib Mullick <rakib.mullick@...il.com>,
        Amritha Nambiar <amritha.nambiar@...el.com>,
        Michael Kelley <mhkelley@...look.com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] cpumask: provide a dummy cpumask_next_wrap

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.

Fixes: 2ca653d607ce ("virtio_net: Stripe queue affinities across cores.")
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Caleb Raitto <caraitto@...gle.com>
Cc: Willem de Bruijn <willemb@...gle.com>
Cc: David S. Miller <davem@...emloft.net>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 include/linux/cpumask.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/cpumask.h b/include/linux/cpumask.h
index 57f20a0a7794..079ba06309bd 100644
--- a/include/linux/cpumask.h
+++ b/include/linux/cpumask.h
@@ -159,6 +159,11 @@ static inline unsigned int cpumask_next_and(int n,
 	return n+1;
 }
 
+static inline int cpumask_next_wrap(int n, const struct cpumask *mask, int start, bool wrap)
+{
+	return n;
+}
+
 /* cpu must be a valid cpu, ie 0, so there's no other choice. */
 static inline unsigned int cpumask_any_but(const struct cpumask *mask,
 					   unsigned int cpu)
-- 
2.18.0