mm: add architecture primitives for software dirty bit clearing
There are primitives to create and query the software dirty bits
in a pte or pmd. But the clearing of the software dirty bits is done
in common code with x86 specific page table functions.
Add the missing architecture primitives to clear the software dirty
bits to allow the feature to be used on non-x86 systems, e.g. the
s390 architecture.
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 867da5b..81e144d 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -318,6 +318,16 @@
return pmd_set_flags(pmd, _PAGE_SOFT_DIRTY);
}
+static inline pte_t pte_clear_soft_dirty(pte_t pte)
+{
+ return pte_clear_flags(pte, _PAGE_SOFT_DIRTY);
+}
+
+static inline pmd_t pmd_clear_soft_dirty(pmd_t pmd)
+{
+ return pmd_clear_flags(pmd, _PAGE_SOFT_DIRTY);
+}
+
#endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */
/*