/* prepare the bits and mask */
shift_width = ce_info->lsb % 8;
- mask = (u8)(BIT(ce_info->width) - 1);
+ mask = GENMASK(ce_info->width - 1 + shift_width, shift_width);
src_byte = *from;
- src_byte &= mask;
-
- /* shift to correct alignment */
- mask <<= shift_width;
src_byte <<= shift_width;
+ src_byte &= mask;
/* get the current bits from the target bit string */
dest = dest_ctx + (ce_info->lsb / 8);
/* prepare the bits and mask */
shift_width = ce_info->lsb % 8;
- mask = BIT(ce_info->width) - 1;
+ mask = GENMASK(ce_info->width - 1 + shift_width, shift_width);
/* don't swizzle the bits until after the mask because the mask bits
* will be in a different bit position on big endian machines
*/
src_word = *(u16 *)from;
- src_word &= mask;
-
- /* shift to correct alignment */
- mask <<= shift_width;
src_word <<= shift_width;
+ src_word &= mask;
/* get the current bits from the target bit string */
dest = dest_ctx + (ce_info->lsb / 8);
/* prepare the bits and mask */
shift_width = ce_info->lsb % 8;
-
- /* if the field width is exactly 32 on an x86 machine, then the shift
- * operation will not work because the SHL instructions count is masked
- * to 5 bits so the shift will do nothing
- */
- if (ce_info->width < 32)
- mask = BIT(ce_info->width) - 1;
- else
- mask = (u32)~0;
+ mask = GENMASK(ce_info->width - 1 + shift_width, shift_width);
/* don't swizzle the bits until after the mask because the mask bits
* will be in a different bit position on big endian machines
*/
src_dword = *(u32 *)from;
- src_dword &= mask;
-
- /* shift to correct alignment */
- mask <<= shift_width;
src_dword <<= shift_width;
+ src_dword &= mask;
/* get the current bits from the target bit string */
dest = dest_ctx + (ce_info->lsb / 8);
/* prepare the bits and mask */
shift_width = ce_info->lsb % 8;
-
- /* if the field width is exactly 64 on an x86 machine, then the shift
- * operation will not work because the SHL instructions count is masked
- * to 6 bits so the shift will do nothing
- */
- if (ce_info->width < 64)
- mask = BIT_ULL(ce_info->width) - 1;
- else
- mask = (u64)~0;
+ mask = GENMASK_ULL(ce_info->width - 1 + shift_width, shift_width);
/* don't swizzle the bits until after the mask because the mask bits
* will be in a different bit position on big endian machines
*/
src_qword = *(u64 *)from;
- src_qword &= mask;
-
- /* shift to correct alignment */
- mask <<= shift_width;
src_qword <<= shift_width;
+ src_qword &= mask;
/* get the current bits from the target bit string */
dest = dest_ctx + (ce_info->lsb / 8);