Messages in this thread Patch in this message | | | Date | Thu, 04 Jun 2009 18:18:59 +0200 | From | Martin Schwidefsky <> | Subject | [patch 12/38] pm: add kernel_page_present |
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From: Hans-Joachim Picht <hans@linux.vnet.ibm.com>
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> --- arch/s390/mm/pgtable.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+)
Index: linux-2.6/arch/s390/mm/pgtable.c =================================================================== --- linux-2.6.orig/arch/s390/mm/pgtable.c +++ linux-2.6/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 */ + -- blue skies, Martin.
"Reality continues to ruin my life." - Calvin.
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