linux-kernel - Re: Remove empty /proc/device-tree when no openfirmware exists.

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Date:	Tue, 17 Dec 2013 10:55:17 -0500
From:	Josh Boyer <jwboyer@...oraproject.org>
To:	Dave Jones <davej@...hat.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>,
	Al Viro <viro@...iv.linux.org.uk>,
	Paul Mackerras <paulus@...ba.org>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: Remove empty /proc/device-tree when no openfirmware exists.

On Mon, May 14, 2012 at 12:41 PM, Dave Jones <davej@...hat.com> wrote:
> distribution kernels might want to build in support for /proc/device-tree
> for kernels that might end up running on hardware that doesn't support openfirmware.
> This results in an empty /proc/device-tree existing.
> Remove it if the OFW root node doesn't exist.
>
> [This situation actually confuses grub2, resulting in install failures.
>  grub2 sees the /proc/device-tree and picks the wrong install target
>  cf. http://bzr.savannah.gnu.org/lh/grub/trunk/grub/annotate/4300/util/grub-install.in#L311
>  grub should be more robust, but still, leaving an empty proc dir seems pointless. ]
>
> Signed-off-by: Dave Jones <davej@...hat.com>

We're still carrying this in Fedora for
https://bugzilla.redhat.com/show_bug.cgi?id=818378 .  Can we get this
upstream sometime soon?

josh

> diff --git a/fs/proc/proc_devtree.c b/fs/proc/proc_devtree.c
> index 927cbd1..f060f28 100644
> --- a/fs/proc/proc_devtree.c
> +++ b/fs/proc/proc_devtree.c
> @@ -233,6 +233,7 @@ void __init proc_device_tree_init(void)
>                 return;
>         root = of_find_node_by_path("/");
>         if (root == NULL) {
> +               remove_proc_entry("device-tree", NULL);
>                 pr_debug("/proc/device-tree: can't find root\n");
>                 return;
>         }
> --
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