From 3a66941106855215127f8bf1afd06099b72dc75b Mon Sep 17 00:00:00 2001 From: Russell King Date: Wed, 22 Jun 2005 21:43:10 +0100 Subject: [PATCH] [PATCH] ARM: Ensure memory information is page aligned Ensure that meminfo.bank[] array contains page-aligned start/size information. Signed-off-by: Russell King --- arch/arm/kernel/setup.c | 25 ++++++++++++++++--------- 1 file changed, 16 insertions(+), 9 deletions(-) diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index 9fed5fa194d9..8cf733daa800 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; } -- GitLab