Re: [PATCH v6 01/38] minmax: Add in_range() macro

[Phi Nguyen]

On 8/2/2023 11:13 PM, Matthew Wilcox (Oracle) wrote:
> diff --git a/include/linux/minmax.h b/include/linux/minmax.h
> index 798c6963909f..83aebc244cba 100644
> --- a/include/linux/minmax.h
> +++ b/include/linux/minmax.h
> @@ -3,6 +3,7 @@
>   #define _LINUX_MINMAX_H
>   
>   #include <linux/const.h>
> +#include <linux/types.h>
>   
>   /*
>    * min()/max()/clamp() macros must accomplish three things:
> @@ -222,6 +223,32 @@
>    */
>   #define clamp_val(val, lo, hi) clamp_t(typeof(val), val, lo, hi)
>   
> +static inline bool in_range64(u64 val, u64 start, u64 len)
> +{
> +	return (val - start) < len;
> +}
> +
> +static inline bool in_range32(u32 val, u32 start, u32 len)
> +{
> +	return (val - start) < len;
> +}
> +

I think these two functions return wrong result if val is smaller than 
start and len is big enough.