* [PATCH] mac80211: sequence number micro-optimisation
@ 2009-08-10 14:02 Johannes Berg
0 siblings, 0 replies; only message in thread
From: Johannes Berg @ 2009-08-10 14:02 UTC (permalink / raw)
To: John Linville; +Cc: linux-wireless
There's no need to mask the variable with 0xFFF0
since we ever only use it as a u16 and the lowest
four bits can't ever be non-zero. The compiler
cannot infer the latter, and therefore has to emit
code to do the masking.
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
---
net/mac80211/tx.c | 1 -
1 file changed, 1 deletion(-)
--- wireless-testing.orig/net/mac80211/tx.c 2009-08-10 13:34:45.000000000 +0200
+++ wireless-testing/net/mac80211/tx.c 2009-08-10 13:34:58.000000000 +0200
@@ -700,7 +700,6 @@ ieee80211_tx_h_sequence(struct ieee80211
/* for pure STA mode without beacons, we can do it */
hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
tx->sdata->sequence_number += 0x10;
- tx->sdata->sequence_number &= IEEE80211_SCTL_SEQ;
return TX_CONTINUE;
}
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2009-08-10 14:02 [PATCH] mac80211: sequence number micro-optimisation Johannes Berg
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