From: Eric Dumazet <edumazet@google.com>
Date: Tue, 10 May 2022 03:57:38 +0000 (-0700)
Subject: net: add CONFIG_DEBUG_NET
X-Git-Tag: v6.1-rc5~1274^2~145^2~3
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d268c1f5cfc92eb5bb605f7365769aacd93be234;p=platform%2Fkernel%2Flinux-starfive.git

net: add CONFIG_DEBUG_NET

This config option enables network debugging checks.

This patch adds DEBUG_NET_WARN_ON_ONCE(cond)
Note that this is not a replacement for WARN_ON_ONCE(cond)
as (cond) is not evaluated if CONFIG_DEBUG_NET is not set.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/include/net/net_debug.h b/include/net/net_debug.h
index 19cd270..1e74684 100644
--- a/include/net/net_debug.h
+++ b/include/net/net_debug.h
@@ -148,4 +148,10 @@ do {								\
 #endif
 
 
+#if defined(CONFIG_DEBUG_NET)
+#define DEBUG_NET_WARN_ON_ONCE(cond) (void)WARN_ON_ONCE(cond)
+#else
+#define DEBUG_NET_WARN_ON_ONCE(cond) BUILD_BUG_ON_INVALID(cond)
+#endif
+
 #endif	/* _LINUX_NET_DEBUG_H */
diff --git a/net/Kconfig.debug b/net/Kconfig.debug
index 2f50611..a5781cf 100644
--- a/net/Kconfig.debug
+++ b/net/Kconfig.debug
@@ -17,3 +17,10 @@ config NET_NS_REFCNT_TRACKER
 	help
 	  Enable debugging feature to track netns references.
 	  This adds memory and cpu costs.
+
+config DEBUG_NET
+	bool "Add generic networking debug"
+	depends on DEBUG_KERNEL
+	help
+	  Enable extra sanity checks in networking.
+	  This is mostly used by fuzzers, but is safe to select.