From a5a608d83e0e680f44e8d25e860e5d57633b5bcb Mon Sep 17 00:00:00 2001
From: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Date: Thu, 18 Oct 2012 18:26:42 +0200
Subject: [PATCH] sched, numa, mm, s390/thp: Implement pmd_pgprot() for s390

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

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/s390/include/asm/pgtable.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index dd647c919a66..098fc5a6bd52 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1240,6 +1240,19 @@ static inline void set_pmd_at(struct mm_struct *mm, unsigned long addr,
 	*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;
-- 
2.39.5