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| author |   Hans-Joachim Picht <hans@linux.vnet.ibm.com> | 2009-06-16 10:30:26 +0200 |
|---|---|---|
| committer |   Martin Schwidefsky <schwidefsky@de.ibm.com> | 2009-06-16 10:31:11 +0200 |
| commit | 7db11a363fc41cec170a94a3542031e5e64bb333 (patch) | |
| tree | 26cf776715697fcfdc903c919972b7ff095af23a /arch/s390 | |
| parent | [S390] pm: dasd power management callbacks. (diff) | |
| download | linux-dev-7db11a363fc41cec170a94a3542031e5e64bb333.tar.xz linux-dev-7db11a363fc41cec170a94a3542031e5e64bb333.zip | |
[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>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/mm/pgtable.c | 19 |
1 files changed, 19 insertions, 0 deletions
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 */ + |