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lib: packing: replace bit_reverse() with bitrev8() 

Remove bit_reverse() function.  Instead use bitrev8() from linux/bitrev.h +
bitshift.  Reduces code-repetition.

Signed-off-by: Uladzislau Koshchanka <koshchanka@gmail.com>
Link: https://lore.kernel.org/r/20221210004423.32332-1-koshchanka@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Uladzislau Koshchanka 2022-12-10 03:44:23 +03:00 committed by Jakub Kicinski
parent 93e637a37b
commit 1280d4b76f
2 changed files with 3 additions and 14 deletions
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1
lib/Kconfig
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@ -24,6 +24,7 @@ config LINEAR_RANGES
config PACKING config PACKING
bool "Generic bitfield packing and unpacking" bool "Generic bitfield packing and unpacking"
select BITREVERSE
default n default n
help help
This option provides the packing() helper function, which permits This option provides the packing() helper function, which permits

16
lib/packing.c
View File

@ -7,6 +7,7 @@
#include <linux/bitops.h> #include <linux/bitops.h>
#include <linux/errno.h> #include <linux/errno.h>
#include <linux/types.h> #include <linux/types.h>
#include <linux/bitrev.h>
static int get_le_offset(int offset) 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; 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, static void adjust_for_msb_right_quirk(u64 *to_write, int *box_start_bit,
int *box_end_bit, u8 *box_mask) 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; int new_box_start_bit, new_box_end_bit;
*to_write >>= *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; *to_write <<= *box_end_bit;
new_box_end_bit = box_bit_width - *box_start_bit - 1; new_box_end_bit = box_bit_width - *box_start_bit - 1;