linux-kernel - Re: linux-next: rr tree build failure

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Date:	Sat, 22 Nov 2008 13:01:06 +1030
From:	Rusty Russell <rusty@...tcorp.com.au>
To:	Greg KH <gregkh@...e.de>
Cc:	Stephen Rothwell <sfr@...b.auug.org.au>,
	linux-kernel@...r.kernel.org, Pete Zaitcev <zaitcev@...hat.com>
Subject: Re: linux-next: rr tree build failure

On Saturday 22 November 2008 05:04:03 Greg KH wrote:
> On Fri, Nov 21, 2008 at 09:28:51PM +1030, Rusty Russell wrote:
> > Greg, here's the complete patch I have now:
> >
> > Subject: USB: Use core_param.
> >
> > Found this when I changed args to __module_param_call.  We now have
> > core_param for exactly this.
> >
> > This reverts to the 2005 (pre- aafbf24a) behaviour where "nousb" was
> > not a module parameter, just a kernel command line parameter.  That's
> > more sensible anyway.
>
...
> No, we need to keep that module parameter please, some distros and users
> rely on it.

Fair enough.  Patch below does this as moduleparam.h suggests.

It still means that the paremeter appears in 
/sys/module/kernel/parameters/nousb OR
/sys/module/usbcore/parameters/nousb.

FYI, if Pete had discovered this __setup issue today, the correct fix would
be:
1) core_param(nousb) for backwards compat.
2) module_param(disable) for modern users who want module/in-built symmetry
   (ie. boot cmdline "usbcore.disable", and "modprobe usbcore disable")


USB: Don't use __module_param_call

Found this when I changed args to __module_param_call.  We now have
core_param for exactly this, but Greg assures me "nousb" is used as a
module parameter, using the method suggested in moduleparam.h will
have to do.

Signed-off-by: Rusty Russell <rusty@...tcorp.com.au>
Cc: Greg Kroah-Hartman <gregkh@...e.de>
Cc: Pete Zaitcev <zaitcev@...hat.com>
---
 drivers/usb/core/usb.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/usb/core/usb.c b/drivers/usb/core/usb.c
--- a/drivers/usb/core/usb.c
+++ b/drivers/usb/core/usb.c
@@ -962,9 +962,6 @@ void usb_buffer_unmap_sg(const struct us
 }
 EXPORT_SYMBOL_GPL(usb_buffer_unmap_sg);
 
-/* format to disable USB on kernel command line is: nousb */
-__module_param_call("", nousb, param_set_bool, param_get_bool, &nousb, 0444);
-
 /*
  * for external read access to <nousb>
  */
@@ -1052,6 +1049,11 @@ static void __exit usb_exit(void)
 	ksuspend_usb_cleanup();
 }
 
+/* To disable USB, kernel command line is 'nousb' not 'usbcore.nousb' */
+#undef MODULE_PARAM_PREFIX
+#define MODULE_PARAM_PREFIX
+module_param(nousb, bool, 0444);
+
 subsys_initcall(usb_init);
 module_exit(usb_exit);
 MODULE_LICENSE("GPL");

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