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cfg80211: mark ieee80211_hdrlen const

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This function analyses only its single, value-passed
argument, and has no side effects. Thus it can be
const, which makes mac80211 smaller, for example:

   text	   data	    bss	    dec	    hex	filename
 362518	  16720	    884	 380122	  5ccda	mac80211.ko (before)
 362358	  16720	    884	 379962	  5cc3a	mac80211.ko (after)

a 160 byte saving in text size, and an optimisation
because the function won't be called as often.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg 2010-08-12 14:49:58 +02:00 committed by John W. Linville
parent b68b3c4d92
commit 633adf1ad1
2 changed files with 2 additions and 2 deletions
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2
include/net/cfg80211.h
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@ -1715,7 +1715,7 @@ unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb);
* ieee80211_hdrlen - get header length in bytes from frame control
* @fc: frame control field in little-endian format
*/
unsigned int ieee80211_hdrlen(__le16 fc);
unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc);
/**
* ieee80211_data_to_8023 - convert an 802.11 data frame to 802.3

2
net/wireless/util.c
View File

@ -221,7 +221,7 @@ const unsigned char bridge_tunnel_header[] __aligned(2) =
{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
EXPORT_SYMBOL(bridge_tunnel_header);
unsigned int ieee80211_hdrlen(__le16 fc)
unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
{
unsigned int hdrlen = 24;