From 7db11a363fc41cec170a94a3542031e5e64bb333 Mon Sep 17 00:00:00 2001 From: Hans-Joachim Picht Date: Tue, 16 Jun 2009 10:30:26 +0200 Subject: [PATCH] [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 Signed-off-by: Martin Schwidefsky --- arch/s390/mm/pgtable.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) diff --git a/arch/s390/mm/pgtable.c b/arch/s390/mm/pgtable.c index 4ca8e826bf30..565667207985 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 */ + -- 2.20.1