linux-next: build failure after merge of the tip tree

Stephen Rothwell
2016-11-17T03:22:30Z

Hi all,

After merging the tip tree, today's linux-next build (arm
multi_v7_defconfig) failed like this:

net/core/dev.c: In function 'sk_busy_loop':
net/core/dev.c:5065:3: error: implicit declaration of function 'cpu_relax_lowlatency' [-Werror=implicit-function-declaration]
cpu_relax_lowlatency();
^

Caused by commit

5bd0b85ba8bb ("locking/core, arch: Remove cpu_relax_lowlatency()")

interacting with commit

217f69743681 ("net: busy-poll: allow preemption in sk_busy_loop()")

from the net-next tree.

I have applied the following merge fix patch.

From: Stephen Rothwell <sfr@canb.auug.org.au>
Date: Thu, 17 Nov 2016 14:13:05 +1100
Subject: [PATCH] net: busy-poll: fix up for cpu_relax_lowlatency() removal

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
---
net/core/dev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/core/dev.c b/net/core/dev.c
index d29d538ec5ad..6b9f8eb55b62 100644
--- a/net/core/dev.c
+++ b/net/core/dev.c
@@ -5062,7 +5062,7 @@ bool sk_busy_loop(struct sock *sk, int nonblock)
return rc;
goto restart;
}
- cpu_relax_lowlatency();
+ cpu_relax();
}
if (napi_poll)
busy_poll_stop(napi, have_poll_lock);
--
2.10.2

--
Cheers,
Stephen Rothwell