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Add a hint to the compiler that the radiotap header requires 8-byte 

alignment.  This

        1 helps GCC make better code for architectures such as ARM
          where it would otherwise do a lot of byte-loads and shifts
          to load a multi-byte word, and

        2 ensures that the compiler will add no padding between a
          radiotap header and a 64-bit or narrower field that
          follows it.
This commit is contained in:
dyoung 2007-01-06 05:51:15 +00:00
parent 7fe712ebf1
commit f5e353f96f
1 changed files with 2 additions and 2 deletions
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4
sys/net80211/ieee80211_radiotap.h
View File

@ -1,5 +1,5 @@
/* $FreeBSD: src/sys/net80211/ieee80211_radiotap.h,v 1.5 2005/01/22 20:12:05 sam Exp $ */
/* $NetBSD: ieee80211_radiotap.h,v 1.15 2006/03/12 03:22:02 dyoung Exp $ */
/* $NetBSD: ieee80211_radiotap.h,v 1.16 2007/01/06 05:51:15 dyoung Exp $ */
/*-
* Copyright (c) 2003, 2004 David Young. All rights reserved.
@ -81,7 +81,7 @@ struct ieee80211_radiotap_header {
* Additional extensions are made
* by setting bit 31.
*/
} __attribute__((__packed__));
} __attribute__((__packed__, __aligned__(8)));
/*
* Name Data type Units