ARM: 5929/1: Add checks to detect overlap of memory regions.

Tested-by: H Hartley Sweeten <hsweeten@visionengravers.com>

Signed-off-by: Andreas Fenkart <andreas.fenkart@streamunlimited.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 17 insertions, 0 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 3a2077239474..7829cb5425f5 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -686,6 +686,23 @@ void __init mem_init(void)
 #undef MLM
 #undef MLK_ROUNDUP
 
+        /*
+         * Check boundaries twice: Some fundamental inconsistencies can
+         * be detected at build time already.
+         */
+#ifdef CONFIG_MMU
+        BUILD_BUG_ON(VMALLOC_END                        > CONSISTENT_BASE);
+        BUG_ON(VMALLOC_END                              > CONSISTENT_BASE);
+
+        BUILD_BUG_ON(TASK_SIZE                          > MODULES_VADDR);
+        BUG_ON(TASK_SIZE                                > MODULES_VADDR);
+#endif
+
+#ifdef CONFIG_HIGHMEM
+        BUILD_BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE > PAGE_OFFSET);
+        BUG_ON(PKMAP_BASE + LAST_PKMAP * PAGE_SIZE      > PAGE_OFFSET);
+#endif
+
         if (PAGE_SIZE >= 16384 && num_physpages <= 128) {
                 extern int sysctl_overcommit_memory;
                 /*