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Commit f4d2897b authored by Anisse Astier's avatar Anisse Astier Committed by Linus Torvalds
Browse files

mm/page_alloc.c: cleanup obsolete KM_USER* 



It's been five years now that KM_* kmap flags have been removed and that
we can call clear_highpage from any context.  So we remove prep_zero_pages
accordingly.

Signed-off-by: default avatarAnisse Astier <anisse@astier.eu>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c761471b

mm/page_alloc.c

+2 −15
Original line number Diff line number Diff line
@@ -380,20 +380,6 @@ void prep_compound_page(struct page *page, unsigned long order) 
	}

}



static inline void prep_zero_page(struct page *page, unsigned int order,

							gfp_t gfp_flags)

{

	int i;



	/*

	 * clear_highpage() will use KM_USER0, so it's a bug to use __GFP_ZERO

	 * and __GFP_HIGHMEM from hard or soft interrupt context.

	 */

	VM_BUG_ON((gfp_flags & __GFP_HIGHMEM) && in_interrupt());

	for (i = 0; i < (1 << order); i++)

		clear_highpage(page + i);

}



#ifdef CONFIG_DEBUG_PAGEALLOC

unsigned int _debug_guardpage_minorder;

bool _debug_pagealloc_enabled __read_mostly;
@@ -975,7 +961,8 @@ static int prep_new_page(struct page *page, unsigned int order, gfp_t gfp_flags, 
	kasan_alloc_pages(page, order);



	if (gfp_flags & __GFP_ZERO)

		prep_zero_page(page, order, gfp_flags);

		for (i = 0; i < (1 << order); i++)

			clear_highpage(page + i);



	if (order && (gfp_flags & __GFP_COMP))

		prep_compound_page(page, order);