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Commit c3993076 authored by Johannes Weiner's avatar Johannes Weiner Committed by Linus Torvalds
Browse files

mm: page_alloc: generalize order handling in __free_pages_bootmem() 



__free_pages_bootmem() used to special-case higher-order frees to save
individual page checking with free_pages_bulk().

Nowadays, both zero order and non-zero order frees use free_pages(), which
checks each individual page anyway, and so there is little point in making
the distinction anymore.  The higher-order loop will work just fine for
zero order pages.

Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
Cc: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 43d2b113

mm/page_alloc.c

+12 −21
Original line number Diff line number Diff line
@@ -730,24 +730,16 @@ static void __free_pages_ok(struct page *page, unsigned int order) 
	local_irq_restore(flags);

}



/*

 * permit the bootmem allocator to evade page validation on high-order frees

 */

void __meminit __free_pages_bootmem(struct page *page, unsigned int order)

{

	if (order == 0) {

		__ClearPageReserved(page);

		set_page_count(page, 0);

		set_page_refcounted(page);

		__free_page(page);

	} else {

		int loop;

	unsigned int nr_pages = 1 << order;

	unsigned int loop;



	prefetchw(page);

		for (loop = 0; loop < (1 << order); loop++) {

	for (loop = 0; loop < nr_pages; loop++) {

		struct page *p = &page[loop];



			if (loop + 1 < (1 << order))

		if (loop + 1 < nr_pages)

			prefetchw(p + 1);

		__ClearPageReserved(p);

		set_page_count(p, 0);
@@ -756,7 +748,6 @@ void __meminit __free_pages_bootmem(struct page *page, unsigned int order) 
	set_page_refcounted(page);

	__free_pages(page, order);

}

}





/*