From 9b718e758ac91f28b6cdd354ad5ee9c767daae74 Mon Sep 17 00:00:00 2001
From: Ingo Molnar <mingo@kernel.org>
Date: Sun, 28 Oct 2012 14:10:14 +0100
Subject: [PATCH] sched, numa, mm, s390/thp: Add pmd_mknotpresent()

We'd like to make use of pmd_mknotpresent() in mm/, but
not all architectures have it. This patch adds the s390
version.

Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
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>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Link: http://lkml.kernel.org/r/20121028131014.GA10754@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
 arch/s390/include/asm/pgtable.h | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 098fc5a6bd52..b820ff1db35e 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)
-- 
2.39.5