[PATCH] ARM: Ensure memory information is page aligned
Ensure that meminfo.bank[] array contains page-aligned start/size
information.
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 9fed5fa..8cf733d 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -395,6 +395,20 @@
}
__early_param("initrd=", early_initrd);
+static void __init add_memory(unsigned long start, unsigned long size)
+{
+ /*
+ * Ensure that start/size are aligned to a page boundary.
+ * Size is appropriately rounded down, start is rounded up.
+ */
+ size -= start & ~PAGE_MASK;
+
+ meminfo.bank[meminfo.nr_banks].start = PAGE_ALIGN(start);
+ meminfo.bank[meminfo.nr_banks].size = size & PAGE_MASK;
+ meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
+ meminfo.nr_banks += 1;
+}
+
/*
* Pick out the memory size. We look for mem=size@start,
* where start and size are "size[KkMm]"
@@ -419,10 +433,7 @@
if (**p == '@')
start = memparse(*p + 1, p);
- meminfo.bank[meminfo.nr_banks].start = start;
- meminfo.bank[meminfo.nr_banks].size = size;
- meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(start);
- meminfo.nr_banks += 1;
+ add_memory(start, size);
}
__early_param("mem=", early_mem);
@@ -564,11 +575,7 @@
tag->u.mem.start, tag->u.mem.size / 1024);
return -EINVAL;
}
- meminfo.bank[meminfo.nr_banks].start = tag->u.mem.start;
- meminfo.bank[meminfo.nr_banks].size = tag->u.mem.size;
- meminfo.bank[meminfo.nr_banks].node = PHYS_TO_NID(tag->u.mem.start);
- meminfo.nr_banks += 1;
-
+ add_memory(tag->u.mem.start, tag->u.mem.size);
return 0;
}