linux-kernel - [PATCH v3 23/34] xtensa: mm: Add p?d

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Message-Id: <20190227170608.27963-24-steven.price@arm.com>
Date:   Wed, 27 Feb 2019 17:05:57 +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>,
        Chris Zankel <chris@...kel.net>,
        Max Filippov <jcmvbkbc@...il.com>,
        linux-xtensa@...ux-xtensa.org
Subject: [PATCH v3 23/34] xtensa: 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 xtensa, we don't support large pages, so add a stub returning 0.

CC: Chris Zankel <chris@...kel.net>
CC: Max Filippov <jcmvbkbc@...il.com>
CC: linux-xtensa@...ux-xtensa.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/xtensa/include/asm/pgtable.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 29cfe421cf41..60c3e86b9782 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -266,6 +266,7 @@ static inline void pgtable_cache_init(void) { }
 #define pmd_none(pmd)	 (!pmd_val(pmd))
 #define pmd_present(pmd) (pmd_val(pmd) & PAGE_MASK)
 #define pmd_bad(pmd)	 (pmd_val(pmd) & ~PAGE_MASK)
+#define pmd_large(pmd)	 (0)
 #define pmd_clear(pmdp)	 do { set_pmd(pmdp, __pmd(0)); } while (0)
 
 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
-- 
2.20.1