linux-kernel - Re: Command line parameter not passed to module in linux-next

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Message-Id: <200903021115.23878.rusty@rustcorp.com.au>
Date:	Mon, 2 Mar 2009 11:15:23 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Christof Schmitt <christof.schmitt@...ibm.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: Command line parameter not passed to module in linux-next

On Saturday 28 February 2009 03:31:05 Christof Schmitt wrote:
> The linux-next kernel does not pass charp parameters from the kernel
> command line to modules:
> 
> # cat /proc/cmdline 
> dasd=4d70-4d73 root=/dev/dasdc1 zfcp.device=0.0.181d,0x500507630310c562,0x401040C300000000 zfcp.dbfsize=4096  BOOT_IMAGE=0 
> 
> # cat /sys/module/zfcp/parameters/device 
> <NULL>

Thanks:

param: fix charp parameters set via sysfs: FIX

We can't kmalloc at early cmdline parsing.

Reported-by: Christof Schmitt <christof.schmitt@...ibm.com>
Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>

diff --git a/kernel/params.c b/kernel/params.c
--- a/kernel/params.c
+++ b/kernel/params.c
@@ -223,10 +223,16 @@ int param_set_charp(const char *val, str
 	if (kp->perm & KPARAM_KMALLOCED)
 		kfree(*(char **)kp->arg);
 
-	kp->perm |= KPARAM_KMALLOCED;
-	*(char **)kp->arg = kstrdup(val, GFP_KERNEL);
-	if (!kp->arg)
-		return -ENOMEM;
+	/* This is a hack.  We can't need to strdup in early boot, and we
+	 * don't need to; this mangled commandline is preserved. */
+	if (slab_is_available()) {
+		kp->perm |= KPARAM_KMALLOCED;
+		*(char **)kp->arg = kstrdup(val, GFP_KERNEL);
+		if (!kp->arg)
+			return -ENOMEM;
+	} else
+		*(const char **)kp->arg = val;
+
 	return 0;
 }
 
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