linux-kernel - [PATCH net-next] configs/debug: run and debug PREEMPT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250402172305.1775226-1-sdf@fomichev.me>
Date: Wed,  2 Apr 2025 10:23:05 -0700
From: Stanislav Fomichev <sdf@...ichev.me>
To: netdev@...r.kernel.org
Cc: davem@...emloft.net,
	edumazet@...gle.com,
	kuba@...nel.org,
	pabeni@...hat.com,
	paulmck@...nel.org,
	joel@...lfernandes.org,
	steven.price@....com,
	akpm@...ux-foundation.org,
	matttbe@...nel.org,
	anshuman.khandual@....com,
	sdf@...ichev.me,
	linux-kernel@...r.kernel.org
Subject: [PATCH net-next] configs/debug: run and debug PREEMPT

Recent change [0] resulted in a "BUG: using __this_cpu_read() in
preemptible" splat [1]. PREEMPT kernels have additional requirements
on what can and can not run with/without preemption enabled.
Expose those constrains in the debug kernels.

0: https://lore.kernel.org/netdev/20250314120048.12569-2-justin.iurman@uliege.be/
1: https://lore.kernel.org/netdev/20250402094458.006ba2a7@kernel.org/T/#mbf72641e9d7d274daee9003ef5edf6833201f1bc

Signed-off-by: Stanislav Fomichev <sdf@...ichev.me>
---
 kernel/configs/debug.config | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/kernel/configs/debug.config b/kernel/configs/debug.config
index 8aafd050b754..e81327d2cd63 100644
--- a/kernel/configs/debug.config
+++ b/kernel/configs/debug.config
@@ -112,3 +112,8 @@ CONFIG_BRANCH_PROFILE_NONE=y
 CONFIG_DYNAMIC_FTRACE=y
 CONFIG_FTRACE=y
 CONFIG_FUNCTION_TRACER=y
+#
+# Preemption
+#
+CONFIG_DEBUG_PREEMPT=y
+CONFIG_PREEMPT=y
-- 
2.49.0