[RFC PATCH 1/3] powerpc/mem: Store the dt_root_size/addr cell values for later usage

[Aneesh Kumar K.V]

dt_root_addr_cells and dt_root_size_cells are __initdata variables.
So make a copy of the same which can be used post init.

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar at linux.ibm.com>
---
 arch/powerpc/include/asm/drmem.h | 2 ++
 arch/powerpc/kernel/prom.c       | 7 +++++++
 arch/powerpc/mm/numa.c           | 1 +
 3 files changed, 10 insertions(+)

diff --git a/arch/powerpc/include/asm/drmem.h b/arch/powerpc/include/asm/drmem.h
index 07c158c5f939..1f0eaf432755 100644
--- a/arch/powerpc/include/asm/drmem.h
+++ b/arch/powerpc/include/asm/drmem.h
@@ -123,4 +123,6 @@ static inline void lmb_clear_nid(struct drmem_lmb *lmb)
 }
 #endif
 
+extern int mem_addr_cells, mem_size_cells;
+
 #endif /* _ASM_POWERPC_LMB_H */
diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index d8a2fb87ba0c..9a1701e85747 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c
@@ -73,6 +73,7 @@ u64 ppc64_rma_size;
 #endif
 static phys_addr_t first_memblock_size;
 static int __initdata boot_cpu_count;
+int mem_addr_cells, mem_size_cells;
 
 static int __init early_parse_mem(char *p)
 {
@@ -536,6 +537,12 @@ static int __init early_init_dt_scan_memory_ppc(unsigned long node,
 						const char *uname,
 						int depth, void *data)
 {
+	/*
+	 * Make a copy from __initdata variable
+	 */
+	mem_addr_cells = dt_root_addr_cells;
+	mem_size_cells = dt_root_size_cells;
+
 #ifdef CONFIG_PPC_PSERIES
 	if (depth == 1 &&
 	    strcmp(uname, "ibm,dynamic-reconfiguration-memory") == 0) {
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index 058fee9a0835..77d41d9775d2 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -368,6 +368,7 @@ static void __init get_n_mem_cells(int *n_addr_cells, int *n_size_cells)
 	of_node_put(memory);
 }
 
+/*  dt_mem_next_cell is __init  */
 static unsigned long read_n_cells(int n, const __be32 **buf)
 {
 	unsigned long result = 0;
-- 
2.26.2