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| author | Felix Fietkau <nbd@openwrt.org> | 2010-10-16 03:01:48 +0400 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2010-11-10 00:13:25 +0300 |
| commit | ada9f1cacb66b74a68254521bb5e3ca4eb8fa871 (patch) | |
| tree | b8a256f5f4bd42c9ec37102638cc49e1a11eb242 /drivers/net/wireless/ath/ath9k/mac.h | |
| parent | f0e94b479c987abef17eb18e5c8e0ed178d00cd4 (diff) | |
| download | linux-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/mac.h')
| -rw-r--r-- | drivers/net/wireless/ath/ath9k/mac.h | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/net/wireless/ath/ath9k/mac.h b/drivers/net/wireless/ath/ath9k/mac.h index fdc25074ca1f..22907e21cc46 100644 --- a/drivers/net/wireless/ath/ath9k/mac.h +++ b/drivers/net/wireless/ath/ath9k/mac.h @@ -237,7 +237,7 @@ struct ath_desc { u32 ds_ctl1; u32 ds_hw[20]; void *ds_vdata; -} __packed; +} __packed __aligned(4); #define ATH9K_TXDESC_CLRDMASK 0x0001 #define ATH9K_TXDESC_NOACK 0x0002 @@ -307,7 +307,7 @@ struct ar5416_desc { u32 status8; } rx; } u; -} __packed; +} __packed __aligned(4); #define AR5416DESC(_ds) ((struct ar5416_desc *)(_ds)) #define AR5416DESC_CONST(_ds) ((const struct ar5416_desc *)(_ds)) |