[PATCH] s390: Add pmd_mknotpresent()

[Ingo Molnar]

There's a related problem on s390: other THP implementations 
have pmd_mknotpresent() while s390 not, resulting in:

  mm/huge_memory.c:1543:2: error: implicit declaration of function 'pmd_mknotpresent'

The (untested!) patch below adds the s390 version of this 
method.

Gerald, Martin, did I get the S390 details right?

Thanks,

	Ingo

Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 098fc5a..b820ff1 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1310,6 +1310,12 @@ static inline pmd_t pmd_mkyoung(pmd_t pmd)
 	return pmd;
 }
 
+static inline pmd_t pmd_mknotpresent(pmd_t pmd)
+{
+	pmd_val(pmd) &= ~_SEGMENT_ENTRY_ORIGIN;
+	return pmd;
+}
+
 #define __HAVE_ARCH_PMDP_TEST_AND_CLEAR_YOUNG
 static inline int pmdp_test_and_clear_young(struct vm_area_struct *vma,
 					    unsigned long address, pmd_t *pmdp)
--
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