linux-kernel - undefined reference to `__clear_user' (was: Re: [patch 2/13] signal/timer/event fds v10

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Date:	Sun, 13 May 2007 12:28:23 +0200 (CEST)
From:	Geert Uytterhoeven <geert@...ux-m68k.org>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	"Eric W. Biederman" <ebiederm@...ssion.com>
Subject: undefined reference to `__clear_user' (was: Re: [patch 2/13]
 signal/timer/event fds v10 - signalfd core ...)

	Hi Davide,

On Mon, 2 Apr 2007, Davide Libenzi wrote:
> --- /dev/null	1970-01-01 00:00:00.000000000 +0000
> +++ linux-2.6.21-rc5.fds/fs/signalfd.c	2007-04-02 15:06:29.000000000 -0700

> +/*
> + * Copied from copy_siginfo_to_user() in kernel/signal.c
> + */
> +static int signalfd_copyinfo(struct signalfd_siginfo __user *uinfo,
> +			     siginfo_t const *kinfo)
> +{
> +	long err;
> +
> +	BUILD_BUG_ON(sizeof(struct signalfd_siginfo) != 128);
> +
> +	/*
> +	 * Unused memebers should be zero ...
> +	 */
> +	err = __clear_user(uinfo, sizeof(*uinfo));
              ^^^^^^^^^^^^

Shouldn't this be `clear_user()'? I don't see any access_ok() calls
before this call (I do see them in copy_siginfo_to_user() in
kernel/signal.c), but of course I may miss something...

I only noticed because m68k doesn't have __clear_user(), as this routine
was never needed by generic code before your change.

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@...ux-m68k.org

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds
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