lkml.org 
[lkml]   [2018]   [Feb]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Date
SubjectRe: [PATCH] of: Kconfig: OF_OVERLAY, select OF_EARLY_FLATTREE
On Sun, Feb 18, 2018 at 6:29 PM,  <frowand.list@gmail.com> wrote:
> From: Frank Rowand <frank.rowand@sony.com>
>
> kbuild test robot reported a new warning for a recent patch:
>>> drivers/of/overlay.c:832:2: error: implicit declaration of function 'of_fdt_unflatten_tree' [-Werror=implicit-function-declaration]
> of_fdt_unflatten_tree(new_fdt, NULL, &overlay_root);
>
> The cause is that the prototype for of_fdt_unflatten_tree() in
> include/linux/of_fdt.c is guarded by OF_EARLY_FLATTREE.
>
> This was a pre-existing problem for any overlay related caller of
> of_fdt_unflatten_device_tree(), who was then going to pass the
> unflattened tree to of_overlay_apply(). After the patch that triggered
> this warning, all other overlay callers of of_fdt_unflatten_device_tree()
> no longer exist, so adding the select to OF_OVERLAY is a sufficient fix.
>
> To reproduce the warning:
> Use the .config attached to https://lkml.org/lkml/2018/2/17/268
> make ARCH=i386 olddefconfig
> make ARCH=i386 CC=gcc-7 drivers/of/overlay.o
>
> Signed-off-by: Frank Rowand <frank.rowand@sony.com>
> ---
> drivers/of/Kconfig | 1 +
> 1 file changed, 1 insertion(+)
>
> diff --git a/drivers/of/Kconfig b/drivers/of/Kconfig
> index 783e0870bd22..00a6abfaaec7 100644
> --- a/drivers/of/Kconfig
> +++ b/drivers/of/Kconfig
> @@ -92,6 +92,7 @@ config OF_RESOLVE
> config OF_OVERLAY
> bool "Device Tree overlays"
> select OF_DYNAMIC
> + select OF_EARLY_FLATTREE

If we do this, we might as well kill OF_EARLY_FLATTREE. What platform
really boots from not FDT, but uses DT without overlays?

Rob

\
 
 \ /
  Last update: 2018-02-19 02:47    [W:0.131 / U:0.180 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site