linux-kernel - [PATCH v3 10/34] microblaze: mm: Add p?d

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Message-Id: <20190227170608.27963-11-steven.price@arm.com>
Date:   Wed, 27 Feb 2019 17:05:44 +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>,
        Michal Simek <monstr@...str.eu>
Subject: [PATCH v3 10/34] microblaze: 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 microblaze, we don't support large pages, so add stubs returning 0.

CC: Michal Simek <monstr@...str.eu>
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/microblaze/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index 142d3f004848..044ea7dbb4cc 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -303,6 +303,7 @@ extern unsigned long empty_zero_page[1024];
 #define pmd_none(pmd)		(!pmd_val(pmd))
 #define	pmd_bad(pmd)		((pmd_val(pmd) & _PMD_PRESENT) == 0)
 #define	pmd_present(pmd)	((pmd_val(pmd) & _PMD_PRESENT) != 0)
+#define	pmd_large(pmd)		(0)
 #define	pmd_clear(pmdp)		do { pmd_val(*(pmdp)) = 0; } while (0)
 
 #define pte_page(x)		(mem_map + (unsigned long) \
@@ -323,6 +324,7 @@ extern unsigned long empty_zero_page[1024];
 static inline int pgd_none(pgd_t pgd)		{ return 0; }
 static inline int pgd_bad(pgd_t pgd)		{ return 0; }
 static inline int pgd_present(pgd_t pgd)	{ return 1; }
+static inline int pgd_large(pgd_t pgd)		{ return 0; }
 #define pgd_clear(xp)				do { } while (0)
 #define pgd_page(pgd) \
 	((unsigned long) __va(pgd_val(pgd) & PAGE_MASK))
-- 
2.20.1