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authorFelix Fietkau <nbd@openwrt.org>2010-10-16 03:01:48 +0400
committerJohn W. Linville <linville@tuxdriver.com>2010-11-10 00:13:25 +0300
commitada9f1cacb66b74a68254521bb5e3ca4eb8fa871 (patch)
treeb8a256f5f4bd42c9ec37102638cc49e1a11eb242 /drivers/net/wireless/ath/ath9k/ar9003_mac.h
parentf0e94b479c987abef17eb18e5c8e0ed178d00cd4 (diff)
downloadlinux-ada9f1cacb66b74a68254521bb5e3ca4eb8fa871.tar.xz
ath9k_hw: optimize all descriptor access functions
Because all of the descriptor data structures are marked as __packed, GCC assumes the worst case wrt. alignment and generates unaligned load/store instructions on MIPS for access to all fields. Since descriptors always have to be 4-byte-aligned, we can just mark the data structures with __aligned(4), which allows GCC to generate much more efficient code. Verified through disassembly and OProfile comparisons. Signed-off-by: Felix Fietkau <nbd@openwrt.org> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/ath/ath9k/ar9003_mac.h')
-rw-r--r--drivers/net/wireless/ath/ath9k/ar9003_mac.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/net/wireless/ath/ath9k/ar9003_mac.h b/drivers/net/wireless/ath/ath9k/ar9003_mac.h
index 9f2cea70a840..45cc7e80436c 100644
--- a/drivers/net/wireless/ath/ath9k/ar9003_mac.h
+++ b/drivers/net/wireless/ath/ath9k/ar9003_mac.h
@@ -65,7 +65,7 @@ struct ar9003_rxs {
u32 status9;
u32 status10;
u32 status11;
-} __packed;
+} __packed __aligned(4);
/* Transmit Control Descriptor */
struct ar9003_txc {
@@ -93,7 +93,7 @@ struct ar9003_txc {
u32 ctl21; /* DMA control 21 */
u32 ctl22; /* DMA control 22 */
u32 pad[9]; /* pad to cache line (128 bytes/32 dwords) */
-} __packed;
+} __packed __aligned(4);
struct ar9003_txs {
u32 ds_info;
@@ -105,7 +105,7 @@ struct ar9003_txs {
u32 status6;
u32 status7;
u32 status8;
-} __packed;
+} __packed __aligned(4);
void ar9003_hw_attach_mac_ops(struct ath_hw *hw);
void ath9k_hw_set_rx_bufsize(struct ath_hw *ah, u16 buf_size);