From: Gerald Schaefer <redacted>

This patch adds an implementation of pmd_pgprot() for s390,
in preparation to future THP changes.

Reported-by: Stephen Rothwell <redacted>
Signed-off-by: Gerald Schaefer <redacted>
Cc: Martin Schwidefsky <redacted>
Cc: Heiko Carstens <redacted>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <redacted>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/s390/include/asm/pgtable.h |   13 +++++++++++++
 1 file changed, 13 insertions(+)

Index: tip/arch/s390/include/asm/pgtable.h
===================================================================

--- tip.orig/arch/s390/include/asm/pgtable.h
+++ tip/arch/s390/include/asm/pgtable.h

@@ -1240,6 +1240,19 @@ static inline void set_pmd_at(struct mm_
 	*pmdp = entry;
 }
 
+static inline pgprot_t pmd_pgprot(pmd_t pmd)
+{
+	pgprot_t prot = PAGE_RW;
+
+	if (pmd_val(pmd) & _SEGMENT_ENTRY_RO) {
+		if (pmd_val(pmd) & _SEGMENT_ENTRY_INV)
+			prot = PAGE_NONE;
+		else
+			prot = PAGE_RO;
+	}
+	return prot;
+}
+
 static inline unsigned long massage_pgprot_pmd(pgprot_t pgprot)
 {
 	unsigned long pgprot_pmd = 0;


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