linux-kernel - [PATCH] m68k: Enable memtest kernel parameter

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Date:   Thu, 11 Nov 2021 12:10:47 +1100
From:   Finn Thain <fthain@...ux-m68k.org>
To:     Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:     "Mike Rapoport" <rppt@...nel.org>, "Sam Creasey" <sammy@...my.net>,
        linux-m68k@...ts.linux-m68k.org, linux-kernel@...r.kernel.org
Subject: [PATCH] m68k: Enable memtest kernel parameter

Enable the memtest feature and rearrange some code to prevent it from
clobbering the initrd.

The CONFIG_BLK_DEV_INITRD symbol was conditional on !defined(CONFIG_SUN3).
For simplicity, remove that test on the basis that m68k_ramdisk.size == 0
on Sun 3.

The SLIME source code at http://sammy.net/ shows that no BI_RAMDISK entry
is ever passed to the kernel due to #ifdef 0 around the relevant code.

Cc: Mike Rapoport <rppt@...nel.org>
Cc: Sam Creasey <sammy@...my.net>
Signed-off-by: Finn Thain <fthain@...ux-m68k.org>
---
Are there any other Linux bootloaders on Sun 3?
---
 arch/m68k/Kconfig           |  1 +
 arch/m68k/kernel/setup_mm.c | 15 ++++++---------
 arch/m68k/mm/motorola.c     |  2 ++
 3 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/m68k/Kconfig b/arch/m68k/Kconfig
index 0b50da08a9c5..0e96066b3c46 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/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c
index 4b51bfd38e5f..49e573b94326 100644
--- a/arch/m68k/kernel/setup_mm.c
+++ b/arch/m68k/kernel/setup_mm.c
@@ -338,13 +338,6 @@ void __init setup_arch(char **cmdline_p)
 		panic("No configuration setup");
 	}
 
-	paging_init();
-
-#ifdef CONFIG_NATFEAT
-	nf_init();
-#endif
-
-#ifndef CONFIG_SUN3
 #ifdef CONFIG_BLK_DEV_INITRD
 	if (m68k_ramdisk.size) {
 		memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
@@ -354,6 +347,12 @@ void __init setup_arch(char **cmdline_p)
 	}
 #endif
 
+	paging_init();
+
+#ifdef CONFIG_NATFEAT
+	nf_init();
+#endif
+
 #ifdef CONFIG_ATARI
 	if (MACH_IS_ATARI)
 		atari_stram_reserve_pages((void *)availmem);
@@ -364,8 +363,6 @@ void __init setup_arch(char **cmdline_p)
 	}
 #endif
 
-#endif /* !CONFIG_SUN3 */
-
 /* set ISA defs early as possible */
 #if defined(CONFIG_ISA) && defined(MULTI_ISA)
 	if (MACH_IS_Q40) {
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 9f3f77785aa7..5b6575eb6d02 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