RE: [PATCH v4 4/6] treewide: use get_random_u32() when possible

David Laight
2022-10-08T22:19:14Z

From: Jason A. Donenfeld
> Sent: 07 October 2022 19:01
>
> The prandom_u32() function has been a deprecated inline wrapper around
> get_random_u32() for several releases now, and compiles down to the
> exact same code. Replace the deprecated wrapper with a direct call to
> the real function. The same also applies to get_random_int(), which is
> just a wrapper around get_random_u32().
>
...
> diff --git a/net/802/garp.c b/net/802/garp.c
> index f6012f8e59f0..c1bb67e25430 100644
> --- a/net/802/garp.c
> +++ b/net/802/garp.c
> @@ -407,7 +407,7 @@ static void garp_join_timer_arm(struct garp_applicant *app)
> {
> unsigned long delay;
>
> - delay = (u64)msecs_to_jiffies(garp_join_time) * prandom_u32() >> 32;
> + delay = (u64)msecs_to_jiffies(garp_join_time) * get_random_u32() >> 32;
> mod_timer(&app->join_timer, jiffies + delay);
> }
>
> diff --git a/net/802/mrp.c b/net/802/mrp.c
> index 35e04cc5390c..3e9fe9f5d9bf 100644
> --- a/net/802/mrp.c
> +++ b/net/802/mrp.c
> @@ -592,7 +592,7 @@ static void mrp_join_timer_arm(struct mrp_applicant *app)
> {
> unsigned long delay;
>
> - delay = (u64)msecs_to_jiffies(mrp_join_time) * prandom_u32() >> 32;
> + delay = (u64)msecs_to_jiffies(mrp_join_time) * get_random_u32() >> 32;
> mod_timer(&app->join_timer, jiffies + delay);
> }
>

Aren't those:
delay = prandom_u32_max(msecs_to_jiffies(xxx_join_time));

David

-
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