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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