linux-kernel - [PATCH v3 01/34] alpha: mm: Add p?d

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Date:   Wed, 27 Feb 2019 17:05:35 +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>,
        linux-alpha@...r.kernel.org, Richard Henderson <rth@...ddle.net>,
        Ivan Kokshaysky <ink@...assic.park.msu.ru>,
        Matt Turner <mattst88@...il.com>
Subject: [PATCH v3 01/34] alpha: 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 will be provided by the
p?d_large() functions/macros.

For alpha, we don't support huge pages, so add stubs returning 0.

CC: linux-alpha@...r.kernel.org
CC: Richard Henderson <rth@...ddle.net>
CC: Ivan Kokshaysky <ink@...assic.park.msu.ru>
CC: Matt Turner <mattst88@...il.com>
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/alpha/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 89c2032f9960..e5726d3a3200 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -254,11 +254,13 @@ extern inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
 extern inline int pmd_none(pmd_t pmd)		{ return !pmd_val(pmd); }
 extern inline int pmd_bad(pmd_t pmd)		{ return (pmd_val(pmd) & ~_PFN_MASK) != _PAGE_TABLE; }
 extern inline int pmd_present(pmd_t pmd)	{ return pmd_val(pmd) & _PAGE_VALID; }
+extern inline int pmd_large(pmd_t pmd)		{ return 0; }
 extern inline void pmd_clear(pmd_t * pmdp)	{ pmd_val(*pmdp) = 0; }
 
 extern inline int pgd_none(pgd_t pgd)		{ return !pgd_val(pgd); }
 extern inline int pgd_bad(pgd_t pgd)		{ return (pgd_val(pgd) & ~_PFN_MASK) != _PAGE_TABLE; }
 extern inline int pgd_present(pgd_t pgd)	{ return pgd_val(pgd) & _PAGE_VALID; }
+extern inline int pgd_large(pgd_t pgd)		{ return 0; }
 extern inline void pgd_clear(pgd_t * pgdp)	{ pgd_val(*pgdp) = 0; }
 
 /*
-- 
2.20.1