linux-kernel - [PATCH v3 18/34] s390: mm: Add p?d

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Message-Id: <20190227170608.27963-19-steven.price@arm.com>
Date:   Wed, 27 Feb 2019 17:05:52 +0000
From:   Steven Price <steven.price@....com>
To:     linux-mm@...ck.org
Cc:     Steven Price <steven.price@....com>,
        Andy Lutomirski <luto@...nel.org>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Ingo Molnar <mingo@...hat.com>,
        James Morse <james.morse@....com>,
        Jérôme Glisse <jglisse@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Will Deacon <will.deacon@....com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Mark Rutland <Mark.Rutland@....com>,
        "Liang, Kan" <kan.liang@...ux.intel.com>,
        Martin Schwidefsky <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        linux-s390@...r.kernel.org
Subject: [PATCH v3 18/34] s390: mm: Add p?d_large() definitions

walk_page_range() is going to be allowed to walk page tables other than
those of user space. For this it needs to know when it has reached a
'leaf' entry in the page tables. This information is provided by the
p?d_large() functions/macros.

For s390, we don't support large pages, so add a stub returning 0.

CC: Martin Schwidefsky <schwidefsky@...ibm.com>
CC: Heiko Carstens <heiko.carstens@...ibm.com>
CC: linux-s390@...r.kernel.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/s390/include/asm/pgtable.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h
index 063732414dfb..9617f1fb69b4 100644
--- a/arch/s390/include/asm/pgtable.h
+++ b/arch/s390/include/asm/pgtable.h
@@ -605,6 +605,11 @@ static inline int pgd_present(pgd_t pgd)
 	return (pgd_val(pgd) & _REGION_ENTRY_ORIGIN) != 0UL;
 }
 
+static inline int pgd_large(pgd_t pgd)
+{
+	return 0;
+}
+
 static inline int pgd_none(pgd_t pgd)
 {
 	if (pgd_folded(pgd))
@@ -645,6 +650,11 @@ static inline int p4d_present(p4d_t p4d)
 	return (p4d_val(p4d) & _REGION_ENTRY_ORIGIN) != 0UL;
 }
 
+static inline int p4d_large(p4d_t p4d)
+{
+	return 0;
+}
+
 static inline int p4d_none(p4d_t p4d)
 {
 	if (p4d_folded(p4d))
-- 
2.20.1