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authorNicolas Pitre <nico@cam.org>2008-10-06 13:24:40 -0400
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-11-28 15:36:44 +0000
commit4b5f32cee0cce7b9783ced5cbeabd17aa53c51fb (patch)
tree95d3f2af07733cf70419ea5c3ae1100be2533197 /arch/arm/kernel
parent43ae286b7d4d8c4983bc263ef2e3cccc10dedb2b (diff)
[ARM] rationalize memory configuration code some more
Currently there are two instances of struct meminfo: one in kernel/setup.c marked __initdata, and another in mm/init.c with permanent storage. Let's keep only the later to directly populate the permanent version from arm_add_memory(). Also move common validation tests between the MMU and non-MMU cases into arm_add_memory() to remove some duplication. Protection against overflowing the membank array is also moved in there in order to cover the kernel cmdline parsing path as well. Signed-off-by: Nicolas Pitre <nico@marvell.com> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel')
-rw-r--r--arch/arm/kernel/setup.c37
1 files changed, 21 insertions, 16 deletions
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index 1f1eecca7f5..d21786712c8 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -59,7 +59,7 @@ static int __init fpe_setup(char *line)
__setup("fpe=", fpe_setup);
#endif
-extern void paging_init(struct meminfo *, struct machine_desc *desc);
+extern void paging_init(struct machine_desc *desc);
extern void reboot_setup(char *str);
extern void _text, _etext, __data_start, _edata, _end;
@@ -112,7 +112,6 @@ static struct stack stacks[NR_CPUS];
char elf_platform[ELF_PLATFORM_SIZE];
EXPORT_SYMBOL(elf_platform);
-static struct meminfo meminfo __initdata = { 0, };
static const char *cpu_name;
static const char *machine_name;
static char __initdata command_line[COMMAND_LINE_SIZE];
@@ -367,21 +366,34 @@ static struct machine_desc * __init setup_machine(unsigned int nr)
return list;
}
-static void __init arm_add_memory(unsigned long start, unsigned long size)
+static int __init arm_add_memory(unsigned long start, unsigned long size)
{
- struct membank *bank;
+ struct membank *bank = &meminfo.bank[meminfo.nr_banks];
+
+ if (meminfo.nr_banks >= NR_BANKS) {
+ printk(KERN_CRIT "NR_BANKS too low, "
+ "ignoring memory at %#lx\n", start);
+ return -EINVAL;
+ }
/*
* Ensure that start/size are aligned to a page boundary.
* Size is appropriately rounded down, start is rounded up.
*/
size -= start & ~PAGE_MASK;
-
- bank = &meminfo.bank[meminfo.nr_banks++];
-
bank->start = PAGE_ALIGN(start);
bank->size = size & PAGE_MASK;
bank->node = PHYS_TO_NID(start);
+
+ /*
+ * Check whether this memory region has non-zero size or
+ * invalid node number.
+ */
+ if (bank->size == 0 || bank->node >= MAX_NUMNODES)
+ return -EINVAL;
+
+ meminfo.nr_banks++;
+ return 0;
}
/*
@@ -539,14 +551,7 @@ __tagtable(ATAG_CORE, parse_tag_core);
static int __init parse_tag_mem32(const struct tag *tag)
{
- if (meminfo.nr_banks >= NR_BANKS) {
- printk(KERN_WARNING
- "Ignoring memory bank 0x%08x size %dKB\n",
- tag->u.mem.start, tag->u.mem.size / 1024);
- return -EINVAL;
- }
- arm_add_memory(tag->u.mem.start, tag->u.mem.size);
- return 0;
+ return arm_add_memory(tag->u.mem.start, tag->u.mem.size);
}
__tagtable(ATAG_MEM, parse_tag_mem32);
@@ -718,7 +723,7 @@ void __init setup_arch(char **cmdline_p)
memcpy(boot_command_line, from, COMMAND_LINE_SIZE);
boot_command_line[COMMAND_LINE_SIZE-1] = '\0';
parse_cmdline(cmdline_p, from);
- paging_init(&meminfo, mdesc);
+ paging_init(mdesc);
request_standard_resources(&meminfo, mdesc);
#ifdef CONFIG_SMP