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Date: Thu, 04 Feb 2010 13:56:39 -0800 (PST) From: David Miller <davem@...emloft.net> To: penguin-kernel@...ove.SAKURA.ne.jp Cc: opurdila@...acom.com, amwang@...hat.com, linux-kernel@...r.kernel.org, eric.dumazet@...il.com, linux-rdma@...r.kernel.org, netdev@...r.kernel.org, nhorman@...driver.com, linux-sctp@...r.kernel.org Subject: Re: [RFC Patch] net: reserve ports for applications using fixed port numbers From: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> Date: Fri, 5 Feb 2010 06:45:28 +0900 > Octavian Purdila wrote: >> >> int inet_is_reserved_local_port(int port) >> { >> if (test_bit(port, reserved_ports)) >> return 1; >> return 0; >> } >> > Above check is exactly what I'm doing in the LSM hook. But his version can be done inline in 2 or 3 instructions. An LSM hook will result in an indirect function call, all live registers spilled to the stack, then all of those reloaded when the function returns. It will be much more expensive. -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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