linux-kernel - [PATCHv3 07/11] s390/mm: Modify pmdp

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Date:   Tue, 12 Sep 2017 18:39:37 +0300
From:   "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Vineet Gupta <vgupta@...opsys.com>,
        Russell King <linux@...linux.org.uk>,
        Will Deacon <will.deacon@....com>,
        Catalin Marinas <catalin.marinas@....com>,
        Ralf Baechle <ralf@...ux-mips.org>,
        "David S. Miller" <davem@...emloft.net>,
        "Aneesh Kumar K . V" <aneesh.kumar@...ux.vnet.ibm.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Andrea Arcangeli <aarcange@...hat.com>
Cc:     linux-arch@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCHv3 07/11] s390/mm: Modify pmdp_invalidate to return old value.

From: Martin Schwidefsky <schwidefsky@...ibm.com>

It's required to avoid loosing dirty and accessed bits.

Signed-off-by: Martin Schwidefsky <schwidefsky@...ibm.com>
Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
---
 arch/s390/include/asm/pgtable.h | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index dce708e061ea..d3de8ddc55ec 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -1504,10 +1504,11 @@ static inline pmd_t pmdp_huge_clear_flush(struct vm_area_struct *vma,
 }
 
 #define __HAVE_ARCH_PMDP_INVALIDATE
-static inline void pmdp_invalidate(struct vm_area_struct *vma,
+static inline pmd_t pmdp_invalidate(struct vm_area_struct *vma,
 				   unsigned long addr, pmd_t *pmdp)
 {
-	pmdp_xchg_direct(vma->vm_mm, addr, pmdp, __pmd(_SEGMENT_ENTRY_EMPTY));
+	return pmdp_xchg_direct(vma->vm_mm, addr, pmdp,
+			__pmd(_SEGMENT_ENTRY_EMPTY));
 }
 
 #define __HAVE_ARCH_PMDP_SET_WRPROTECT
-- 
2.14.1