From: Ulrich Drepper <drepper@redhat.com>
To: Linux Kernel <linux-kernel@vger.kernel.org>,
"David S. Miller" <davem@davemloft.net>
Subject: ntohs/ntohl and bitops
Date: Tue, 10 Jan 2006 14:02:52 -0800 [thread overview]
Message-ID: <43C42F0C.10008@redhat.com> (raw)
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I just saw this in a patch:
+ if (ntohs(ih->frag_off) & IP_OFFSET)
+ return EBT_NOMATCH;
This isn't optimal, it requires a byte switch little endian machines.
The compiler isn't smart enough. It would be better to use
if (ih->frag_off & ntohs(IP_OFFSET))
where the byte-swap can be done at compile time. This is kind of ugly,
I guess, so maybe a dedicate macro
net_host_bit_p(ih->frag_off, IP_OFFSET)
??
--
➧ Ulrich Drepper ➧ Red Hat, Inc. ➧ 444 Castro St ➧ Mountain View, CA ❖
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next reply other threads:[~2006-01-10 22:03 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-01-10 22:02 Ulrich Drepper [this message]
2006-01-11 8:00 ` ntohs/ntohl and bitops David S. Miller
2006-01-11 8:13 ` Arjan van de Ven
2006-01-11 8:36 ` David S. Miller
2006-01-11 8:36 ` Ulrich Drepper
2006-01-11 8:44 ` David S. Miller
2006-01-11 9:48 ` Jakub Jelinek
2006-01-11 18:35 ` Jan Engelhardt
2006-01-11 18:45 ` Ulrich Drepper
2006-01-11 20:19 ` David S. Miller
2006-01-12 1:04 ` Pavel Machek
2006-01-14 9:52 ` YOSHIFUJI Hideaki / 吉藤英明
2006-01-15 1:46 ` David S. Miller
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