linux-kernel - [PATCH] add kernel parameter to disable module load

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Message-ID: <20120128033450.GA2138@darkstar>
Date:	Sat, 28 Jan 2012 11:34:50 +0800
From:	Dave Young <dyoung@...hat.com>
To:	rusty@...tcorp.com.au, linux-kernel@...r.kernel.org
Subject: [PATCH] add kernel parameter to disable module load

Sometimes we need to test a kernel of same version with code or config
option changes.

We already have sysctl to disable module load, but add a kernel
parameter will be more convenient.
---
 Documentation/kernel-parameters.txt |    2 ++
 kernel/module.c                     |    7 +++++++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index e229769..b5cd482 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1796,6 +1796,8 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
 	nomfgpt		[X86-32] Disable Multi-Function General Purpose
 			Timer usage (for AMD Geode machines).
 
+	nomodule	Disable module load
+
 	nopat		[X86] Disable PAT (page attribute table extension of
 			pagetables) support.
 
diff --git a/kernel/module.c b/kernel/module.c
index 178333c..72395f5 100644
--- a/kernel/module.c
+++ b/kernel/module.c
@@ -3478,6 +3478,13 @@ void print_modules(void)
 	printk("\n");
 }
 
+static int __init module_load_disable(char *str)
+{
+	modules_disabled = 1;
+	return 1;
+}
+__setup("nomodule", module_load_disable);
+
 #ifdef CONFIG_MODVERSIONS
 /* Generate the signature for all relevant module structures here.
  * If these change, we don't want to try to parse the module. */
-- 
1.7.4.4

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