diff options
Diffstat (limited to 'disk/part.c')
| -rw-r--r-- | disk/part.c | 13 |
1 files changed, 7 insertions, 6 deletions
diff --git a/disk/part.c b/disk/part.c index 8982ef3..4cc2fc1 100644 --- a/disk/part.c +++ b/disk/part.c @@ -104,17 +104,18 @@ typedef lbaint_t lba512_t; #endif /* - * Overflowless variant of (block_count * mul_by / 2**div_by) - * when div_by > mul_by + * Overflowless variant of (block_count * mul_by / 2**right_shift) + * when 2**right_shift > mul_by */ -static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by, int div_by) +static lba512_t lba512_muldiv(lba512_t block_count, lba512_t mul_by, + int right_shift) { lba512_t bc_quot, bc_rem; /* x * m / d == x / d * m + (x % d) * m / d */ - bc_quot = block_count >> div_by; - bc_rem = block_count - (bc_quot << div_by); - return bc_quot * mul_by + ((bc_rem * mul_by) >> div_by); + bc_quot = block_count >> right_shift; + bc_rem = block_count - (bc_quot << right_shift); + return bc_quot * mul_by + ((bc_rem * mul_by) >> right_shift); } void dev_print (struct blk_desc *dev_desc) |