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| author | Uladzislau Koshchanka <koshchanka@gmail.com> | 2022-12-10 03:44:23 +0300 |
|---|---|---|
| committer | Jakub Kicinski <kuba@kernel.org> | 2022-12-12 15:06:30 -0800 |
| commit | 1280d4b76f3402645aa7075a53f49a3a14be07a8 (patch) | |
| tree | 840f4a95bb00cfadae979d48e7da568c6746b694 /lib | |
| parent | 93e637a37b2872c2fce6ce4df6e59cdc2fe8ca5e (diff) | |
| download | linux-1280d4b76f3402645aa7075a53f49a3a14be07a8.tar.bz2 | |
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>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig | 1 | ||||
| -rw-r--r-- | 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; |