On Sat, Oct 8, 2022 at 4:37 PM Jason A. Donenfeld [off-list ref] wrote:

On Sat, Oct 08, 2022 at 10:18:45PM +0000, David Laight wrote:

quoted

From: Jason A. Donenfeld

quoted

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().

...

quoted

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));

Probably, but too involved and peculiar for this cleanup.

Feel free to send a particular patch to that maintainer.

I guess the cocci patch looks like this, so maybe I'll put that in 1/7
if I respin this.

@@
expression E;
identifier get_random_u32 =~ "get_random_int|prandom_u32|get_random_u32";
typedef u64;
@@
- ((u64)(E) * get_random_u32() >> 32)
+ prandom_u32_max(E)