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Swap is a function interface that provides exchange function. To avoid code duplication, we can use swap function. ./net/ipv6/icmp.c:344:25-26: WARNING opportunity for swap(). Reported-by: Abaci Robot <abaci@linux.alibaba.com> Link: https://bugzilla.openanolis.cn/show_bug.cgi?id=3896 Signed-off-by: Jiapeng Chong <jiapeng.chong@linux.alibaba.com> Reviewed-by: Simon Horman <simon.horman@corigine.com> Reviewed-by: David Ahern <dsahern@kernel.org> Link: https://lore.kernel.org/r/20230131063456.76302-1-jiapeng.chong@linux.alibaba.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>