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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2005-06-22 21:43:10 +0100
committerRussell King <rmk@dyn-67.arm.linux.org.uk>2005-06-22 21:43:10 +0100
commit3a66941106855215127f8bf1afd06099b72dc75b (patch)
tree69a0ebb1143bcd2732b4d6e013207e8613ebc5b7 /arch
parentb46a58fd4e3cdd107ffccedaa5e233deeb94c5c0 (diff)
[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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/kernel/setup.c25
1 files changed, 16 insertions, 9 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 9fed5fa194d..8cf733daa80 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -395,6 +395,20 @@ static void __init early_initrd(char **p)
}
__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 @@ static void __init early_mem(char **p)
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 @@ static int __init parse_tag_mem32(const struct tag *tag)
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;
}