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bcachefs: Fix undefined behaviour in eytzinger1_first()

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-07-03 11:56:19 -04:00
parent 86d81ec5f5
commit 8ed58789fc
1 changed files with 4 additions and 2 deletions
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6
fs/bcachefs/eytzinger.h
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@ -48,7 +48,7 @@ static inline unsigned eytzinger1_right_child(unsigned i)
static inline unsigned eytzinger1_first(unsigned size)
{
return rounddown_pow_of_two(size);
return size ? rounddown_pow_of_two(size) : 0;
}
static inline unsigned eytzinger1_last(unsigned size)
@ -101,7 +101,9 @@ static inline unsigned eytzinger1_prev(unsigned i, unsigned size)
static inline unsigned eytzinger1_extra(unsigned size)
{
return (size + 1 - rounddown_pow_of_two(size)) << 1;
return size
? (size + 1 - rounddown_pow_of_two(size)) << 1
: 0;
}
static inline unsigned __eytzinger1_to_inorder(unsigned i, unsigned size,