[RFC] m68k: Enable memtest kernel parameter

[Finn Thain <fthain@linux-m68k.org>]

This appears to work on Aranym, QEMU and the Quadra 630 I have here.
It is completely untested on Coldfire etc. I don't even know whether the
right memory mappings are in place for this to actually work as intended.
Would someone take a look please?

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 6e40f7f29ebc..d87e12b4855b 100644
--- a/arch/m68k/Kconfig
+++ b/arch/m68k/Kconfig
@@ -9,6 +9,7 @@ config M68K
 	select ARCH_HAVE_NMI_SAFE_CMPXCHG if RMW_INSNS
 	select ARCH_MIGHT_HAVE_PC_PARPORT if ISA
 	select ARCH_NO_PREEMPT if !COLDFIRE
+	select ARCH_USE_MEMTEST
 	select ARCH_WANT_IPC_PARSE_VERSION
 	select BINFMT_FLAT_ARGVP_ENVP_ON_STACK
 	select DMA_DIRECT_REMAP if HAS_DMA && MMU && !COLDFIRE
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 3a653f0a4188..d6301a094fc1 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -455,6 +455,8 @@ void __init paging_init(void)
 
 	flush_tlb_all();
 
+	early_memtest(min_addr, max_addr);
+
 	/*
 	 * initialize the bad page table and bad page to point
 	 * to a couple of allocated pages
-- 
2.26.3