Re: [PATCH v3 3/3] DT: proc: Add runtime overlay interface in /proc

[Guenter Roeck <linux@roeck-us.net>]

On Fri, Nov 08, 2013 at 05:06:10PM +0200, Pantelis Antoniou wrote:
> Add a runtime interface to /proc to enable generic device tree overlay
> usage.
> 

Hi Pantelis,

> ---
>  fs/proc/proc_devtree.c | 278 +++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 278 insertions(+)
> 
[ ... ]

> +
> +		/* start at 256K at first */
> +		if (od->alloc == 0)
> +			od->alloc = SZ_256K / 2;
> +

I have to include <linux/sizes.h> to get this to build.

Also, even though /proc/device-tree-overlay is supposed to be write only, I get
this:

# cat /proc/device-tree-overlay
cat: [  651.973568] overlay_proc_release: failed to unflatten tree
/proc/device-tree-overlay: Input/output error

which seems to be a bit odd. I did not spend any time to track it down, though.

Otherwise, the code seems to be working well.

Thanks,
Guenter