diff options
Diffstat (limited to 'drivers/md/bcache/bset.c')
| -rw-r--r-- | drivers/md/bcache/bset.c | 16 |
1 files changed, 2 insertions, 14 deletions
diff --git a/drivers/md/bcache/bset.c b/drivers/md/bcache/bset.c index 268f1b685084..e36a108d3648 100644 --- a/drivers/md/bcache/bset.c +++ b/drivers/md/bcache/bset.c @@ -970,22 +970,10 @@ static struct bset_search_iter bset_search_tree(struct bset_tree *t, unsigned int inorder, j, n = 1; do { - /* - * A bit trick here. - * If p < t->size, (int)(p - t->size) is a minus value and - * the most significant bit is set, right shifting 31 bits - * gets 1. If p >= t->size, the most significant bit is - * not set, right shifting 31 bits gets 0. - * So the following 2 lines equals to - * if (p >= t->size) - * p = 0; - * but a branch instruction is avoided. - */ unsigned int p = n << 4; - p &= ((int) (p - t->size)) >> 31; - - prefetch(&t->tree[p]); + if (p < t->size) + prefetch(&t->tree[p]); j = n; f = &t->tree[j]; |