Merge tag 'm68k-for-v6.3-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k

Pull m68k fixes from Geert Uytterhoeven:

 - Fix systems with memory at end of 32-bit address space

 - Fix initrd on systems where memory does not start at address zero

 - Fix 68030 handling of bus errors for addresses in exception tables

* tag 'm68k-for-v6.3-tag2' of git://git.kernel.org/pub/scm/linux/kernel/git/geert/linux-m68k:
  m68k: Only force 030 bus error if PC not in exception table
  m68k: mm: Move initrd phys_to_virt handling after paging_init()
  m68k: mm: Fix systems with memory at end of 32-bit address space

3 files changed, 13 insertions, 11 deletions

diff --git a/arch/m68k/kernel/setup_mm.c b/arch/m68k/kernel/setup_mm.c
index 3a2bb2e8fdad..fbff1cea62ca 100644
--- a/arch/m68k/kernel/setup_mm.c
+++ b/arch/m68k/kernel/setup_mm.c
@@ -326,16 +326,16 @@ void __init setup_arch(char **cmdline_p)
 		panic("No configuration setup");
 	}
 
-#ifdef CONFIG_BLK_DEV_INITRD
-	if (m68k_ramdisk.size) {
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size)
 		memblock_reserve(m68k_ramdisk.addr, m68k_ramdisk.size);
+
+	paging_init();
+
+	if (IS_ENABLED(CONFIG_BLK_DEV_INITRD) && m68k_ramdisk.size) {
 		initrd_start = (unsigned long)phys_to_virt(m68k_ramdisk.addr);
 		initrd_end = initrd_start + m68k_ramdisk.size;
 		pr_info("initrd: %08lx - %08lx\n", initrd_start, initrd_end);
 	}
-#endif
-
-	paging_init();
 
 #ifdef CONFIG_NATFEAT
 	nf_init();
diff --git a/arch/m68k/kernel/traps.c b/arch/m68k/kernel/traps.c
index 5c8cba0efc63..a700807c9b6d 100644
--- a/arch/m68k/kernel/traps.c
+++ b/arch/m68k/kernel/traps.c
@@ -30,6 +30,7 @@
 #include <linux/init.h>
 #include <linux/ptrace.h>
 #include <linux/kallsyms.h>
+#include <linux/extable.h>
 
 #include <asm/setup.h>
 #include <asm/fpu.h>
@@ -545,7 +546,8 @@ static inline void bus_error030 (struct frame *fp)
 			errorcode |= 2;
 
 		if (mmusr & (MMU_I | MMU_WP)) {
-			if (ssw & 4) {
+			/* We might have an exception table for this PC */
+			if (ssw & 4 && !search_exception_tables(fp->ptregs.pc)) {
 				pr_err("Data %s fault at %#010lx in %s (pc=%#lx)\n",
 				       ssw & RW ? "read" : "write",
 				       fp->un.fmtb.daddr,
diff --git a/arch/m68k/mm/motorola.c b/arch/m68k/mm/motorola.c
index 2a375637e007..911301224078 100644
--- a/arch/m68k/mm/motorola.c
+++ b/arch/m68k/mm/motorola.c
@@ -437,7 +437,7 @@ void __init paging_init(void)
 	}
 
 	min_addr = m68k_memory[0].addr;
-	max_addr = min_addr + m68k_memory[0].size;
+	max_addr = min_addr + m68k_memory[0].size - 1;
 	memblock_add_node(m68k_memory[0].addr, m68k_memory[0].size, 0,
 			  MEMBLOCK_NONE);
 	for (i = 1; i < m68k_num_memory;) {
@@ -452,21 +452,21 @@ void __init paging_init(void)
 		}
 		memblock_add_node(m68k_memory[i].addr, m68k_memory[i].size, i,
 				  MEMBLOCK_NONE);
-		addr = m68k_memory[i].addr + m68k_memory[i].size;
+		addr = m68k_memory[i].addr + m68k_memory[i].size - 1;
 		if (addr > max_addr)
 			max_addr = addr;
 		i++;
 	}
 	m68k_memoffset = min_addr - PAGE_OFFSET;
-	m68k_virt_to_node_shift = fls(max_addr - min_addr - 1) - 6;
+	m68k_virt_to_node_shift = fls(max_addr - min_addr) - 6;
 
 	module_fixup(NULL, __start_fixup, __stop_fixup);
 	flush_icache();
 
-	high_memory = phys_to_virt(max_addr);
+	high_memory = phys_to_virt(max_addr) + 1;
 
 	min_low_pfn = availmem >> PAGE_SHIFT;
-	max_pfn = max_low_pfn = max_addr >> PAGE_SHIFT;
+	max_pfn = max_low_pfn = (max_addr >> PAGE_SHIFT) + 1;
 
 	/* Reserve kernel text/data/bss and the memory allocated in head.S */
 	memblock_reserve(m68k_memory[0].addr, availmem - m68k_memory[0].addr);