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Commit 7db11a36 authored by Hans-Joachim Picht's avatar Hans-Joachim Picht Committed by Martin Schwidefsky
Browse files

[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: default avatarHans-Joachim Picht <hans@linux.vnet.ibm.com>
Signed-off-by: default avatarMartin 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 */