linux-kernel - Re: [2.6.27.2] Unnamed entry appears in/sys/module/usbcore/parameters/ .

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Date:	Thu, 23 Oct 2008 20:14:47 +0900
From:	Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp>
To:	greg@...ah.com
Cc:	linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [2.6.27.2] Unnamed entry appears in/sys/module/usbcore/parameters/ .

Hello.

I tested 2.6.27.3 on Debian Sarge. I got the same result.

So, I tried to produce different results.

I pruned declaration of module_param(usbfs_snoop) like

  static int usbfs_snoop;
  /*
  module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  */

and I got the below result.

  # ls -ail /sys/module/usbcore/parameters/
  total 0
  189 drwxr-xr-x  2 root root    0 Oct 24  2008
  189 drwxr-xr-x  2 root root    0 Oct 24  2008 .
  188 drwxr-xr-x  4 root root    0 Oct 24  2008 ..
  190 -rw-r--r--  1 root root 4096 Oct 24  2008 autosuspend
  192 -r--r--r--  1 root root 4096 Oct 24  2008 blinkenlights
  193 -rw-r--r--  1 root root 4096 Oct 24  2008 old_scheme_first

This time, 'use_both_schemes' entry became no-name.

I added declaration of module_param(usbfs_aaaaa) and module_param(usbfs_zzzzz)
like

  static int usbfs_aaaaa;
  module_param(usbfs_aaaaa, bool, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(usbfs_aaaaa, "true to log all usbfs traffic");
  
  static int usbfs_snoop;
  module_param(usbfs_snoop, bool, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(usbfs_snoop, "true to log all usbfs traffic");
  
  static int usbfs_zzzzz;
  module_param(usbfs_zzzzz, bool, S_IRUGO | S_IWUSR);
  MODULE_PARM_DESC(usbfs_zzzzz, "true to log all usbfs traffic");

and I got the below result.

  # ls -ail /sys/module/usbcore/parameters/
  total 0
  189 drwxr-xr-x  2 root root    0 Oct 24  2008
  189 drwxr-xr-x  2 root root    0 Oct 24  2008 .
  188 drwxr-xr-x  4 root root    0 Oct 24  2008 ..
  190 -rw-r--r--  1 root root 4096 Oct 24  2008 autosuspend
  192 -r--r--r--  1 root root 4096 Oct 24  2008 blinkenlights
  193 -rw-r--r--  1 root root 4096 Oct 24  2008 old_scheme_first
  195 -rw-r--r--  1 root root 4096 Oct 24  2008 usbfs_aaaaa
  196 -rw-r--r--  1 root root 4096 Oct 24  2008 usbfs_snoop
  194 -rw-r--r--  1 root root 4096 Oct 24  2008 use_both_schemes

This time, 'usbfs_zzzzz' entry became no-name.

Greg KH wrote:
> I really have no idea what is causing this, and can't seem to duplicate
> this here at all.
It seems to me that somebody is overwriting (or truncating) at address
of module_param(usbfs_snoop) .

Is there a way to change the address of module_param() defined by
usbcore module?

Regards.
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