On Mon, 6 Dec 2021 20:41:29 +0800 Xin Hao <xhao@xxxxxxxxxxxxxxxxx> wrote:
> The damon_rand() func can not be implemented as a macro.
> Example:
> damon_rand(a++, b);
> The value of 'a' will be incremented twice, This is obviously
> unreasonable, So there fix it.
>
> Fixes: b9a6ac4e4ede ("mm/damon: adaptively adjust regions")
> Reported-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
> Signed-off-by: Xin Hao <xhao@xxxxxxxxxxxxxxxxx>
> ---
> include/linux/damon.h | 5 ++++-
> 1 file changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/include/linux/damon.h b/include/linux/damon.h
> index c6df025d8704..bc9c8932b1e8 100644
> --- a/include/linux/damon.h
> +++ b/include/linux/damon.h
> @@ -19,7 +19,10 @@
> #define DAMOS_MAX_SCORE (99)
>
> /* Get a random number in [l, r) */
> -#define damon_rand(l, r) (l + prandom_u32_max(r - l))
> +static inline unsigned long damon_rand(unsigned long l, unsigned long r)
> +{
> + return l + (r - l);
Seems prandom_u32_max() is missed?
Thanks,
SJ
> +}
>
> /**
> * struct damon_addr_range - Represents an address region of [@start, @end).
> --
> 2.31.0
