ARM: OF implies OF_FLATTREE

On the ARM architecture, individual platforms select CONFIG_USE_OF if they need it, but all device tree code is keyed off CONFIG_OF. When building a platform without DT support and manually enabling CONFIG_OF, we now get a number of build errors, e.g.

arch/arm/kernel/devtree.c: In function 'setup_machine_fdt':
arch/arm/kernel/devtree.c:215:19: error: implicit declaration of function 'early_init_dt_verify' [-Werror=implicit-function-declaration]

We could now try to separate the use case of booting from DT vs. the case of using the dynamic implementation, but that seems more complicated than it can gain us.

This simply changes the ARM Kconfig file to always enable OF_RESERVED_MEM and OF_EARLY_FLATTREE when CONFIG_OF is enabled. These options add a little extra code when we just want the dynamic OF implementation, but that seems like a rather obscure case, and this version solves all CONFIG_OF related randconfig regressions.

Signed-off-by Arnd Bergmann <[email protected]>

Fixes 0166dc11be91 ("of: make CONFIG_OF user selectable")

arch/arm/Kconfig +2 -2

index ee104950b30c..da71de8bba4f 100644
@@ -75,6 +75,8 @@ config ARM
        select IRQ_FORCED_THREADING
        select MODULES_USE_ELF_REL
        select NO_BOOTMEM
+       select OF_EARLY_FLATTREE if OF
+       select OF_RESERVED_MEM if OF
        select OLD_SIGACTION
        select OLD_SIGSUSPEND3
        select PERF_USE_VMALLOC

@@ -1695,8 +1697,6 @@ config USE_OF
        bool "Flattened Device Tree support"
        select IRQ_DOMAIN
        select OF
-       select OF_EARLY_FLATTREE
-       select OF_RESERVED_MEM
        help
          Include support for flattened device tree machine descriptions.