ARM: 7382/1: mm: truncate memory banks to fit in 4GB space for classic MMU
If a bank of memory spanning the 4GB boundary is added on a !CONFIG_LPAE
kernel then we will hang early during boot since the memory bank will
have wrapped around to zero.
This patch truncates memory banks for !LPAE configurations when the end
address is not representable in 32 bits.
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index b914113..ebfac78 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -523,7 +523,21 @@
*/
size -= start & ~PAGE_MASK;
bank->start = PAGE_ALIGN(start);
- bank->size = size & PAGE_MASK;
+
+#ifndef CONFIG_LPAE
+ if (bank->start + size < bank->start) {
+ printk(KERN_CRIT "Truncating memory at 0x%08llx to fit in "
+ "32-bit physical address space\n", (long long)start);
+ /*
+ * To ensure bank->start + bank->size is representable in
+ * 32 bits, we use ULONG_MAX as the upper limit rather than 4GB.
+ * This means we lose a page after masking.
+ */
+ size = ULONG_MAX - bank->start;
+ }
+#endif
+
+ bank->size = size & PAGE_MASK;
/*
* Check whether this memory region has non-zero size or
