m68k: Select M68020 as fallback for classic

Building without a CPU selected does not work.

Change the Kconfig logic slightly to make sure we always pick M68020 if
nothing else is enabled.  There are still some intentional warnings for
builds with all platforms disabled.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Link: https://lore.kernel.org/20241030195638.22542-2-arnd@kernel.org
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

diff --git a/arch/m68k/Kconfig.cpu b/arch/m68k/Kconfig.cpu
index e7b5f6b559471ec94437d3ad7da7f90aa0b6b993..c9a7e602d8a4da8e5094762e90c7b1a1ab1acfdf 100644 (file)
--- a/arch/m68k/Kconfig.cpu
+++ b/arch/m68k/Kconfig.cpu
@@ -21,6 +21,7 @@ choice
 config M68KCLASSIC
        bool "Classic M68K CPU/machine family support"
        select HAVE_ARCH_PFN_VALID
+       select M68020 if MMU && !(M68030 || M68040 || M68060)
 
 config COLDFIRE
        bool "Coldfire CPU family support"