ARM: 7113/1: mm: Align bank start to MAX_ORDER_NR_PAGES

The VM subsystem assumes that there are valid memmap entries from the bank start aligned to MAX_ORDER_NR_PAGES. On the Ux500 we have a lot of mem=N arguments on the commandline triggering this bug several times over and causing kernel oops messages. Cc: [email protected] Cc: Michael Bohan <[email protected]> Cc: Nicolas Pitre <[email protected]> Signed-off-by: Johan Palsson <[email protected]> Signed-off-by: Rabin Vincent <[email protected]> Signed-off-by: Linus Walleij <[email protected]> Signed-off-by: Russell King <[email protected]>
mna · Oct 1, 2011 · 002ea9e · 002ea9e
1 parent 47ea91b
commit 002ea9e
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
@@ -496,6 +496,13 @@ static void __init free_unused_memmap(struct meminfo *mi)
 		 */
 		bank_start = min(bank_start,
 				 ALIGN(prev_bank_end, PAGES_PER_SECTION));
+#else
+		/*
+		 * Align down here since the VM subsystem insists that the
+		 * memmap entries are valid from the bank start aligned to
+		 * MAX_ORDER_NR_PAGES.
+		 */
+		bank_start = round_down(bank_start, MAX_ORDER_NR_PAGES);
 #endif
 		/*
 		 * If we had a previous bank, and there is a space