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[ Upstream commit 8439109b76a3c405808383bf9dd532fc4b9c2dbd ] Building on the rtnl_has_listeners helper, add the rtnl_notify_needed helper to check if we can bail out early in the notification routines. Reviewed-by: Jiri Pirko <jiri@nvidia.com> Reviewed-by: Simon Horman <horms@kernel.org> Signed-off-by: Victor Nogueira <victor@mojatatu.com> Signed-off-by: Pedro Tammela <pctammela@mojatatu.com> Link: https://lore.kernel.org/r/20231208192847.714940-3-pctammela@mojatatu.com Signed-off-by: Jakub Kicinski <kuba@kernel.org> Stable-dep-of: 369609fc6272 ("tc: Ensure we have enough buffer space when sending filter netlink notifications") Signed-off-by: Sasha Levin <sashal@kernel.org>