From: Johannes Berg <johannes.berg@xxxxxxxxx>
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@xxxxxxxxx>
---
include/net/cfg80211.h | 2 +-
net/wireless/util.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- wireless-testing.orig/include/net/cfg80211.h 2010-08-12 14:19:40.000000000 +0200
+++ wireless-testing/include/net/cfg80211.h 2010-08-12 14:19:41.000000000 +0200
@@ -1715,7 +1715,7 @@ unsigned int ieee80211_get_hdrlen_from_s
* 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
--- wireless-testing.orig/net/wireless/util.c 2010-08-12 14:19:40.000000000 +0200
+++ wireless-testing/net/wireless/util.c 2010-08-12 14:19:41.000000000 +0200
@@ -221,7 +221,7 @@ const unsigned char bridge_tunnel_header
{ 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;
--
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