linux-kernel - [PATCH v3 12/34] nds32: mm: Add p?d

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Message-Id: <20190227170608.27963-13-steven.price@arm.com>
Date:   Wed, 27 Feb 2019 17:05:46 +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>,
        Greentime Hu <green.hu@...il.com>,
        Vincent Chen <deanbo422@...il.com>
Subject: [PATCH v3 12/34] nds32: 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 nds32, we don't support large pages, so add stubs returning 0.

CC: Greentime Hu <green.hu@...il.com>
CC: Vincent Chen <deanbo422@...il.com>
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/nds32/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
index 9f52db930c00..202ac93c0a6b 100644
--- a/arch/nds32/include/asm/pgtable.h
+++ b/arch/nds32/include/asm/pgtable.h
@@ -309,6 +309,7 @@ static inline pte_t pte_mkspecial(pte_t pte)
 
 #define pmd_none(pmd)         (pmd_val(pmd)&0x1)
 #define pmd_present(pmd)      (!pmd_none(pmd))
+#define pmd_large(pmd)        (0)
 #define	pmd_bad(pmd)	      pmd_none(pmd)
 
 #define copy_pmd(pmdpd,pmdps)	set_pmd((pmdpd), *(pmdps))
@@ -349,6 +350,7 @@ static inline pmd_t __mk_pmd(pte_t * ptep, unsigned long prot)
 #define pgd_none(pgd)		(0)
 #define pgd_bad(pgd)		(0)
 #define pgd_present(pgd)  	(1)
+#define pgd_large(pgd)		(0)
 #define pgd_clear(pgdp)		do { } while (0)
 
 #define page_pte_prot(page,prot)     	mk_pte(page, prot)
-- 
2.20.1