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>
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 5f5e6ae..5311a26 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -68,6 +68,7 @@
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 @@
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 @@
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);