mm/page_alloc.c: remove hand-coded get_order()

[Pavel Machek <pavel@ucw.cz>]

__get_free_pages() is strange interface:

It has underscores, yet get_free_pages() does not exists.

It returns long when most people need pointer.

(And it takes order, when many people want to pass size).

What about creating void *get_free_pages(flags, order) version, then
slowly converting users to it?
									Pavel

---

Remove hand-coded get_order() from page_alloc.c.

Signed-off-by: Pavel Machek <pavel@suse.cz>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 402a504..c48aa45 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4339,9 +4339,7 @@ void *__init alloc_large_system_hash(con
 		else if (hashdist)
 			table = __vmalloc(size, GFP_ATOMIC, PAGE_KERNEL);
 		else {
-			unsigned long order;
-			for (order = 0; ((1UL << order) << PAGE_SHIFT) < size; order++)
-				;
+			unsigned long order = get_order(size);
 			table = (void*) __get_free_pages(GFP_ATOMIC, order);
 			/*
 			 * If bucketsize is not a power-of-two, we may free


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