Commit 7db11a36 authored Jun 16, 2009 by Hans-Joachim Picht Committed by Martin Schwidefsky Jun 16, 2009

[S390] pm: add kernel_page_present



Fix the following build failure caused by make allyesconfig using
CONFIG_HIBERNATION and CONFIG_DEBUG_PAGEALLOC

kernel/built-in.o: In function `saveable_page':
kernel/power/snapshot.c:897: undefined reference to `kernel_page_present'
kernel/built-in.o: In function `safe_copy_page':
kernel/power/snapshot.c:948: undefined reference to `kernel_page_present'
make: *** [.tmp_vmlinux1] Error 1

Signed-off-by: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent d41dd122

arch/s390/mm/pgtable.c

+19 −0

Original line number	Diff line number	Diff line
		@@ -313,3 +313,22 @@ int s390_enable_sie(void)
		return 0;
		}
		EXPORT_SYMBOL_GPL(s390_enable_sie);

		#ifdef CONFIG_DEBUG_PAGEALLOC
		#ifdef CONFIG_HIBERNATION
		bool kernel_page_present(struct page *page)
		{
		unsigned long addr;
		int cc;

		addr = page_to_phys(page);
		asm("lra %1,0(%1)\n"
		"ipm %0\n"
		"srl %0,28"
		:"=d"(cc),"+a"(addr)::"cc");
		return cc == 0;
		}

		#endif /* CONFIG_HIBERNATION */
		#endif /* CONFIG_DEBUG_PAGEALLOC */

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