linux-kernel - Re: Is it possible to directly call do_path

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Message-ID: <4ae3c140701232333j4772794j6e49da2d32c0b26d@mail.gmail.com>
Date:	Wed, 24 Jan 2007 02:33:03 -0500
From:	"Xin Zhao" <uszhaoxin@...il.com>
To:	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: Is it possible to directly call do_path_lookup() in kernel?

I just successfully called do_path_lookup() in my kernel module. I
just removed the "fastcall" from the declaration of do_path_lookup(),
then the problem disappeared. I don't quite understand "fastcall"
though.

Can someone explain it?

Thanks,
-x

On 1/23/07, Xin Zhao <uszhaoxin@...il.com> wrote:
> Hi,
>
> I tried to call the following code in a kernel module:
>
>         error = do_path_lookup(AT_FDCWD, "/etc/profile.d/glib2.csh",
> LOOKUP_PARENT, &nd);
>
> I exported the function do_path_lookup() using
> "EXPORT_SYMBOL_GPL(do_path_lookup);"
>
> But do_path_lookup() caused the "general protection fault: 0000 [#1]"
> kernel error.
>
> I thought it could be the problem of protection error, so I used the
> following codes to enclose the code that calls do_path_lookup(), but
> still got the same error.
>
>         fs = get_fs ();                                                   /* save previous value */
>         set_fs (KERNEL_DS);                                               /* use kernel limit */
>         ......
>         set_fs(fs);
>
> Any idea on this?
>
> Thanks a lot!
>
> -x
>
-
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