2014-11-14 05:36:58

by Wang, Yalin

Subject: [PATCH] carl9170: Convert byte_rev_table uses to bitrev8

Use the inline function instead of directly indexing the array.

This allows some architectures with hardware instructions for bit
reversals to eliminate the array.

Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: Yalin Wang <[email protected]>
---
drivers/net/wireless/ath/carl9170/phy.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/ath/carl9170/phy.c b/drivers/net/wireless/ath/carl9170/phy.c
index b80b213..dca6df1 100644
--- a/drivers/net/wireless/ath/carl9170/phy.c
+++ b/drivers/net/wireless/ath/carl9170/phy.c
@@ -994,7 +994,7 @@ static int carl9170_init_rf_bank4_pwr(struct ar9170 *ar, bool band5ghz,
refsel0 = 0;
refsel1 = 1;
}
- chansel = byte_rev_table[chansel];
+ chansel = bitrev8(chansel);
} else {
if (freq == 2484) {
chansel = 10 + (freq - 2274) / 5;
@@ -1002,7 +1002,7 @@ static int carl9170_init_rf_bank4_pwr(struct ar9170 *ar, bool band5ghz,
} else
chansel = 16 + (freq - 2272) / 5;
chansel *= 4;
- chansel = byte_rev_table[chansel];
+ chansel = bitrev8(chansel);
}

d1 = chansel;
--
2.1.1

2014-11-14 05:32:47

by Joe Perches

Subject: Re: [PATCH] carl9170: Convert byte_rev_table uses to bitrev8

On Fri, 2014-11-14 at 13:16 +0800, Wang, Yalin wrote:
> Use the inline function instead of directly indexing the array.
>
> This allows some architectures with hardware instructions for bit
> reversals to eliminate the array.

This one is already in -next

commit 7a1283d8f5298437a454ec477384dcd9f9f88bac
Author: Joe Perches <[email protected]>
Date: Tue Oct 28 14:18:58 2014 -0700

carl9170: Convert byte_rev_table uses to bitrev8

Use the inline function instead of directly indexing the array.

This allows some architectures with hardware instructions
for bit reversals to eliminate the array.

Signed-off-by: Joe Perches <[email protected]>
Signed-off-by: John W. Linville <[email protected]>