[PATCH] unseeded cnrg warning flooding dmesg fix, v2

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Hi,

A patch based on 5.15.202, in-line for comments + attachment as patch

Public patch by url / commit for future reference:

https://raw.githubusercontent.com/robang74/uchaosys/
4ddd9859582441afe0faf43a227124d8cf579c5c/
cnfg/bothering-warn_unseeded_randomness-fix.patch

Best regards,
Roberto A. Foglietta

From df61514c6e07ae722c87b2727999bdc49a08bcaa Mon Sep 17 00:00:00 2001
From: "Roberto A. Foglietta" <[email protected]>
Date: Tue, 12 May 2026 05:39:41 +0200
Subject: [PATCH] unseeded cnrg warning flooding dmesg fix, v2
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Better than hiding the warning, there is a third approach compared
print_ratelimited() and printk_once(), printk one over N=3D256 which
is fitting this specific case: at boot time too much warnings for
a few seconds but still printing something in case the problem
persists without clogging the log.

On a SMP system the counter might face a race condition due to non
atomic increment and this can lead to skipping a scheduled print or
print two of them when just one was expected. No harm in both cases,
anyway.

To be honest, complaining that a suppression counter might be subject
to a race condition on an SMP system - when, if it weren=E2=80=99t there, a=
n
alarm would be triggered stating that the system is initialising
cryptographic directives without adequate entropy support - seems
a bit surreal to me.

Patch based on Linux kernel 5.15.202 LTS master branch.

v1 -> v2: a bit better English and "git am" format

Signed-off-by: Roberto A. Foglietta <[email protected]>
---
 drivers/char/random.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/char/random.c b/drivers/char/random.c
index 8642326de6e1..eeec336b10fa 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -182,7 +182,8 @@ static void __cold process_random_ready_list(void)
 }

 #define warn_unseeded_randomness() \
- if (IS_ENABLED(CONFIG_WARN_ALL_UNSEEDED_RANDOM) && !crng_ready()) \
+ if (IS_ENABLED(CONFIG_WARN_ALL_UNSEEDED_RANDOM) && !crng_ready() \
+ && !({ static u8 x=3D-1; ++x; })) \
  printk_deferred(KERN_NOTICE "random: %s called from %pS with
crng_init=3D%d\n", \
  __func__, (void *)_RET_IP_, crng_init)

--=20
2.34.1

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