linux-kernel - [PATCH v3 13/34] nios2: mm: Add p?d

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Date:   Wed, 27 Feb 2019 17:05:47 +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>,
        Ley Foon Tan <lftan@...era.com>,
        nios2-dev@...ts.rocketboards.org
Subject: [PATCH v3 13/34] nios2: 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 nios2, we don't support large pages, so add a stub returning 0.

CC: Ley Foon Tan <lftan@...era.com>
CC: nios2-dev@...ts.rocketboards.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/nios2/include/asm/pgtable.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
index db4f7d179220..b6ee0c205279 100644
--- a/arch/nios2/include/asm/pgtable.h
+++ b/arch/nios2/include/asm/pgtable.h
@@ -190,6 +190,11 @@ static inline int pmd_present(pmd_t pmd)
 			&& (pmd_val(pmd) != 0UL);
 }
 
+static inline int pmd_large(pmd_t pmd)
+{
+	return 0;
+}
+
 static inline void pmd_clear(pmd_t *pmdp)
 {
 	pmd_val(*pmdp) = (unsigned long) invalid_pte_table;
-- 
2.20.1