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powerpc: Make early memory scan more resilient to out of order nodes 

We keep track of the size of the lowest block of memory and call
setup_initial_memory_limit() only after we've parsed them all

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Acked-by: Milton Miller <miltonm@bga.com>
This commit is contained in:
Benjamin Herrenschmidt 2011-05-11 20:58:18 +00:00
parent b73a635f34
commit 03bf469add
1 changed files with 10 additions and 5 deletions
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15
arch/powerpc/kernel/prom.c
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@ -68,6 +68,7 @@ int __initdata iommu_force_on;
unsigned long tce_alloc_start, tce_alloc_end;
u64 ppc64_rma_size;
#endif
static phys_addr_t first_memblock_size;
static int __init early_parse_mem(char *p)
{
@ -505,11 +506,14 @@ void __init early_init_dt_add_memory_arch(u64 base, u64 size)
size = 0x80000000ul - base;
}
#endif
/* First MEMBLOCK added, do some special initializations */
if (memstart_addr == ~(phys_addr_t)0)
setup_initial_memory_limit(base, size);
memstart_addr = min((u64)memstart_addr, base);
/* Keep track of the beginning of memory -and- the size of
* the very first block in the device-tree as it represents
* the RMA on ppc64 server
*/
if (base < memstart_addr) {
memstart_addr = base;
first_memblock_size = size;
}
/* Add the chunk to the MEMBLOCK list */
memblock_add(base, size);
@ -694,6 +698,7 @@ void __init early_init_devtree(void *params)
of_scan_flat_dt(early_init_dt_scan_root, NULL);
of_scan_flat_dt(early_init_dt_scan_memory_ppc, NULL);
setup_initial_memory_limit(memstart_addr, first_memblock_size);
/* Save command line for /proc/cmdline and then parse parameters */
strlcpy(boot_command_line, cmd_line, COMMAND_LINE_SIZE);