diff mbox

mac80211: sequence number micro-optimisation

Message ID 1249912960.32614.5.camel@johannes.local (mailing list archive)
State Not Applicable, archived
Headers show

Commit Message

Johannes Berg Aug. 10, 2009, 2:02 p.m. UTC
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(-)



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diff mbox

Patch

--- 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;
 	}