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Subject[PATCH] prefetch() not declared in net/ipv4/route.c on s390x
The recent commit (9f28a2fc0bd77511f649c0a788c7bf9a5fd04edb) to route.c
breaks build on s390x because it leaves prefetch() undeclared.

net/ipv4/route.c: In function 'rt_check_expire':
net/ipv4/route.c:874:4: error: implicit declaration of function 'prefetch' [-Werror=implicit-function-declaration]
cc1: some warnings being treated as errors
make[2]: *** [net/ipv4/route.o] Error 1

Signed-off-by: Dan Horák <>
net/ipv4/route.c | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/net/ipv4/route.c b/net/ipv4/route.c
index 252c512..85cc053 100644
--- a/net/ipv4/route.c
+++ b/net/ipv4/route.c
@@ -91,6 +91,7 @@
#include <linux/rcupdate.h>
#include <linux/times.h>
#include <linux/slab.h>
+#include <linux/prefetch.h>
#include <net/dst.h>
#include <net/net_namespace.h>
#include <net/protocol.h>
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