[PATCH] mm: move page_ext_init after all struct pages are initialized

[Yang Shi]

When DEFERRED_STRUCT_PAGE_INIT is enabled, just a subset of memmap at boot
are initialized, then the rest are initialized in parallel by starting one-off
"pgdatinitX" kernel thread for each node X.

If page_ext_init is called before it, some pages will not have valid extension,
so move page_ext_init() after it.

CC: Joonsoo Kim <iamjoonsoo....@lge.com>
Signed-off-by: Yang Shi <yang....@linaro.org>
---
 init/main.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/init/main.c b/init/main.c
index b3c6e36..2075faf 100644
--- a/init/main.c
+++ b/init/main.c
@@ -606,7 +606,6 @@ asmlinkage __visible void __init start_kernel(void)
                initrd_start = 0;
        }
 #endif
-       page_ext_init();
        debug_objects_mem_init();
        kmemleak_init();
        setup_per_cpu_pageset();
@@ -1004,6 +1003,8 @@ static noinline void __init kernel_init_freeable(void)
        sched_init_smp();
 
        page_alloc_init_late();
+       /* Initialize page ext after all struct pages are initializaed */
+       page_ext_init();
 
        do_basic_setup();
 
-- 
2.0.2