---
title: fls
framework: kernel
role: symbol
role_heading: Function
path: kernel/2869617-fls
---

# fls

## Declaration

```occ
int fls(unsigned int);
```

## See Also

### Non Quad Routines

- [flsll](kernel/2869614-flsll.md)
- [ffs](kernel/1441046-ffs.md)
- [ffsll](kernel/2869615-ffsll.md)