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-rw-r--r--arch/s390/mm/pgtable.c19
1 files changed, 19 insertions, 0 deletions
diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c
index 4ca8e826bf3..56566720798 100644
--- a/arch/s390/mm/pgtable.c
+++ b/arch/s390/mm/pgtable.c
@@ -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 */
+