On Thu, Mar 29, 2018 at 01:53:52PM +0300, Tal Gilboa wrote:
> When calculating difference between samples, the values
> are multiplied by 100. Large values may cause int overflow
> when multiplied (usually on first iteration).
> Fixed by forcing 100 to be of type unsigned long.
>
> Fixes: 4c4dbb4a7363 ("net/mlx5e: Move dynamic interrupt coalescing code to
> include/linux")
> Signed-off-by: Tal Gilboa <[email protected]>
Reviewed-by: Andy Gospodarek <[email protected]>
> ---
> include/linux/net_dim.h | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/include/linux/net_dim.h b/include/linux/net_dim.h
> index bebeaad..29ed8fd 100644
> --- a/include/linux/net_dim.h
> +++ b/include/linux/net_dim.h
> @@ -231,7 +231,7 @@ static inline void net_dim_exit_parking(struct net_dim
> *dim)
> }
>
> #define IS_SIGNIFICANT_DIFF(val, ref) \
> - (((100 * abs((val) - (ref))) / (ref)) > 10) /* more than 10% difference
> */
> + (((100UL * abs((val) - (ref))) / (ref)) > 10) /* more than 10%
> difference */
>
> static inline int net_dim_stats_compare(struct net_dim_stats *curr,
> struct net_dim_stats *prev)
> --
> 1.8.3.1
>
