Commit ace63e37 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

x86: add kernel_map_pages() to 64-bit 



needed for DEBUG_PAGEALLOC support and for unification.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent f5a50ce1

arch/x86/mm/pageattr_64.c

+30 −0
Original line number Diff line number Diff line
@@ -260,3 +260,33 @@ void global_flush_tlb(void) 
	on_each_cpu(flush_kernel_map, NULL, 1, 1);

}

EXPORT_SYMBOL(global_flush_tlb);



#ifdef CONFIG_DEBUG_PAGEALLOC

void kernel_map_pages(struct page *page, int numpages, int enable)

{

	if (PageHighMem(page))

		return;

	if (!enable) {

		debug_check_no_locks_freed(page_address(page),

					   numpages * PAGE_SIZE);

	}



	/*

	 * If page allocator is not up yet then do not call c_p_a():

	 */

	if (!debug_pagealloc_enabled)

		return;



	/*

	 * the return value is ignored - the calls cannot fail,

	 * large pages are disabled at boot time.

	 */

	change_page_attr(page, numpages, enable ? PAGE_KERNEL : __pgprot(0));



	/*

	 * we should perform an IPI and flush all tlbs,

	 * but that can deadlock->flush only current cpu.

	 */

	__flush_tlb_all();

}

#endif