[ARM] prevent crashing when too much RAM installed

This patch will truncate and/or ignore memory banks if their kernel
direct mappings would (partially) overlap with the vmalloc area or
the mappings between the vmalloc area and the address space top, to
prevent crashing during early boot if there happens to be more RAM
installed than we are expecting.

Since the start of the vmalloc area is not at a fixed address (but
the vmalloc end address is, via the per-platform VMALLOC_END define),
a default area of 128M is reserved for vmalloc mappings, which can
be shrunk or enlarged by passing an appropriate vmalloc= command line
option as it is done on x86.

On a board with a 3:1 user:kernel split, VMALLOC_END at 0xfe000000,
two 512M RAM banks and vmalloc=128M (the default), this patch gives:

	Truncating RAM at 20000000-3fffffff to -35ffffff (vmalloc region overlap).
	Memory: 512MB 352MB = 864MB total

On a board with a 3:1 user:kernel split, VMALLOC_END at 0xfe800000,
two 256M RAM banks and vmalloc=768M, this patch gives:

	Truncating RAM at 00000000-0fffffff to -0e7fffff (vmalloc region overlap).
	Ignoring RAM at 10000000-1fffffff (vmalloc region overlap).

Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
Tested-by: Riku Voipio <riku.voipio@iki.fi>

1 files changed, 50 insertions, 0 deletions

diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 2d6d682c206a..25d9a11eb617 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -568,6 +568,55 @@ void __init iotable_init(struct map_desc *io_desc, int nr)
                 create_mapping(io_desc + i);
 }
 
+static int __init check_membank_valid(struct membank *mb)
+{
+        /*
+         * Check whether this memory region has non-zero size.
+         */
+        if (mb->size == 0)
+                return 0;
+
+        /*
+         * Check whether this memory region would entirely overlap
+         * the vmalloc area.
+         */
+        if (phys_to_virt(mb->start) >= VMALLOC_MIN) {
+                printk(KERN_NOTICE "Ignoring RAM at %.8lx-%.8lx "
+                        "(vmalloc region overlap).\n",
+                        mb->start, mb->start + mb->size - 1);
+                return 0;
+        }
+
+        /*
+         * Check whether this memory region would partially overlap
+         * the vmalloc area.
+         */
+        if (phys_to_virt(mb->start + mb->size) < phys_to_virt(mb->start) ||
+            phys_to_virt(mb->start + mb->size) > VMALLOC_MIN) {
+                unsigned long newsize = VMALLOC_MIN - phys_to_virt(mb->start);
+
+                printk(KERN_NOTICE "Truncating RAM at %.8lx-%.8lx "
+                        "to -%.8lx (vmalloc region overlap).\n",
+                        mb->start, mb->start + mb->size - 1,
+                        mb->start + newsize - 1);
+                mb->size = newsize;
+        }
+
+        return 1;
+}
+
+static void __init sanity_check_meminfo(struct meminfo *mi)
+{
+        int i;
+        int j;
+
+        for (i = 0, j = 0; i < mi->nr_banks; i++) {
+                if (check_membank_valid(&mi->bank[i]))
+                        mi->bank[j++] = mi->bank[i];
+        }
+        mi->nr_banks = j;
+}
+
 static inline void prepare_page_table(struct meminfo *mi)
 {
         unsigned long addr;
@@ -753,6 +802,7 @@ void __init paging_init(struct meminfo *mi, struct machine_desc *mdesc)
         void *zero_page;
 
         build_mem_type_table();
+        sanity_check_meminfo(mi);
         prepare_page_table(mi);
         bootmem_init(mi);
         devicemaps_init(mdesc);