linux-kernel - Re: [PATCH] arm: Test for CONFIG_USE_OF to handle the USE

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Date:	Sun, 25 Oct 2015 19:45:08 -0500
From:	Rob Herring <robh@...nel.org>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>
Cc:	Russell King <linux@....linux.org.uk>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] arm: Test for CONFIG_USE_OF to handle the USE_OF=n/OF=y case

On Sun, Oct 25, 2015 at 10:25 AM, Geert Uytterhoeven
<geert@...ux-m68k.org> wrote:
> Until commit 0166dc11be911213 ("of: make CONFIG_OF user selectable"),
> CONFIG_OF=y implied CONFIG_USE_OF=y on ARM, as the former could solely
> be enabled by being selected by the latter.

Arnd sent a similar fix[1] which I prefer.

> However, if the user now manually enables CONFIG_OF=y while
> CONFIG_USE_OF=n:
>
>     arch/arm/kernel/devtree.c: In function 'setup_machine_fdt':
>     arch/arm/kernel/devtree.c:215:2: error: implicit declaration of function 'early_init_dt_verify' [-Werror=implicit-function-declaration]
>       if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys)))
>       ^
>     arch/arm/kernel/devtree.c:218:2: error: implicit declaration of function 'of_flat_dt_match_machine' [-Werror=implicit-function-declaration]
>       mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
>       ^
>     arch/arm/kernel/devtree.c:218:8: warning: assignment makes pointer from integer without a cast
>       mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach);
>             ^
>     arch/arm/kernel/devtree.c:228:3: error: implicit declaration of function 'of_get_flat_dt_root' [-Werror=implicit-function-declaration]
>        dt_root = of_get_flat_dt_root();
>        ^
>     arch/arm/kernel/devtree.c:229:3: error: implicit declaration of function 'of_get_flat_dt_prop' [-Werror=implicit-function-declaration]
>        prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
>        ^
>     arch/arm/kernel/devtree.c:229:8: warning: assignment makes pointer from integer without a cast
>        prop = of_get_flat_dt_prop(dt_root, "compatible", &size);
>             ^
>     arch/arm/kernel/devtree.c:244:2: error: implicit declaration of function 'early_init_dt_scan_nodes' [-Werror=implicit-function-declaration]
>       early_init_dt_scan_nodes();
>       ^
>
> and
>
>     arch/arm/kernel/built-in.o: In function `setup_arch':
>     arch/arm/kernel/setup.c:940: undefined reference to `setup_machine_fdt'
>     arch/arm/kernel/setup.c:979: undefined reference to `arm_dt_init_cpu_maps'
>
> Replace tests for CONFIG_OF by tests for CONFIG_USE_OF where appropriate
> to fix this.
>
> Signed-off-by: Geert Uytterhoeven <geert@...ux-m68k.org>
> ---
> Cfr. http://kisskb.ellerman.id.au/kisskb/buildresult/12531538/
>
> I only fixed the particular issue with the randconfig from the build
> above.  Are there more tests for CONFIG_OF that should be converted to
> CONFIG_USE_OF?

I'd rather move toward removing USE_OF and having arches select if
they use EARLY_FLATTREE.

Rob

[1] http://lists.infradead.org/pipermail/linux-arm-kernel/2015-October/376484.html
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