Remove bit_reverse() function. Instead use bitrev8() from linux/bitrev.h +
bitshift. Reduces code-repetition.
Signed-off-by: Uladzislau Koshchanka <koshchanka@xxxxxxxxx>
---
lib/Kconfig | 1 +
lib/packing.c | 16 ++--------------
2 files changed, 3 insertions(+), 14 deletions(-)
diff --git a/lib/Kconfig b/lib/Kconfig
index 9bbf8a4b2108..cc969ef58a2a 100644
--- a/lib/Kconfig
+++ b/lib/Kconfig
@@ -24,6 +24,7 @@ config LINEAR_RANGES
config PACKING
bool "Generic bitfield packing and unpacking"
+ select BITREVERSE
default n
help
This option provides the packing() helper function, which permits
diff --git a/lib/packing.c b/lib/packing.c
index 9a72f4bbf0e2..a96169237ae6 100644
--- a/lib/packing.c
+++ b/lib/packing.c
@@ -7,6 +7,7 @@
#include <linux/bitops.h>
#include <linux/errno.h>
#include <linux/types.h>
+#include <linux/bitrev.h>
static int get_le_offset(int offset)
{
@@ -29,19 +30,6 @@ static int get_reverse_lsw32_offset(int offset, size_t len)
return word_index * 4 + offset;
}
-static u64 bit_reverse(u64 val, unsigned int width)
-{
- u64 new_val = 0;
- unsigned int bit;
- unsigned int i;
-
- for (i = 0; i < width; i++) {
- bit = (val & (1 << i)) != 0;
- new_val |= (bit << (width - i - 1));
- }
- return new_val;
-}
-
static void adjust_for_msb_right_quirk(u64 *to_write, int *box_start_bit,
int *box_end_bit, u8 *box_mask)
{
@@ -49,7 +37,7 @@ static void adjust_for_msb_right_quirk(u64 *to_write, int *box_start_bit,
int new_box_start_bit, new_box_end_bit;
*to_write >>= *box_end_bit;
- *to_write = bit_reverse(*to_write, box_bit_width);
+ *to_write = bitrev8(*to_write) >> (8 - box_bit_width);
*to_write <<= *box_end_bit;
new_box_end_bit = box_bit_width - *box_start_bit - 1;
--
2.34.1
