m68knommu: Add missing initialization of max_pfn and {min,max}_low_pfn

If max_pfn is not initialized, the block layer may use wrong DMA masks. Replace open-coded shifts by PFN_DOWN(), and drop the "0 on coldfire" comment, as it is not even true on all Coldfires, let alone all m68knommu platforms. Signed-off-by: Geert Uytterhoeven <[email protected]> Acked-by: Greg Ungerer <[email protected]> Tested-By: Greg Ungerer <[email protected]>
kyagi · Nov 22, 2015 · b66f55c · b66f55c
1 parent c73ec31
commit b66f55c
Showing 1 changed file with 6 additions and 3 deletions.
diff --git a/arch/m68k/kernel/setup_no.c b/arch/m68k/kernel/setup_no.c
@@ -238,11 +238,14 @@ void __init setup_arch(char **cmdline_p)
 	 * Give all the memory to the bootmap allocator, tell it to put the
 	 * boot mem_map at the start of memory.
 	 */
+	min_low_pfn = PFN_DOWN(memory_start);
+	max_pfn = max_low_pfn = PFN_DOWN(memory_end);
+
 	bootmap_size = init_bootmem_node(
 			NODE_DATA(0),
-			memory_start >> PAGE_SHIFT, /* map goes here */
-			PAGE_OFFSET >> PAGE_SHIFT,	/* 0 on coldfire */
-			memory_end >> PAGE_SHIFT);
+			min_low_pfn,		/* map goes here */
+			PFN_DOWN(PAGE_OFFSET),
+			max_pfn);
 	/*
 	 * Free the usable memory, we have to make sure we do not free
 	 * the bootmem bitmap so we then reserve it after freeing it :-)