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 b91411371ae19b1ae75c2184b4b26ec6c9b06193..ebfac782593f048c9cf81a5619f0b3d24900ca8c 100644 (file)
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -523,7 +523,21 @@ int __init arm_add_memory(phys_addr_t start, unsigned long size)
         */
        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