linux-kernel - [PATCH v3 05/34] c6x: mm: Add p?d

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Date:   Wed, 27 Feb 2019 17:05:39 +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>,
        Mark Salter <msalter@...hat.com>,
        Aurelien Jacquiot <jacquiot.aurelien@...il.com>,
        linux-c6x-dev@...ux-c6x.org
Subject: [PATCH v3 05/34] c6x: 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 c6x there's no MMU so there's never a large page, so just add stubs.

CC: Mark Salter <msalter@...hat.com>
CC: Aurelien Jacquiot <jacquiot.aurelien@...il.com>
CC: linux-c6x-dev@...ux-c6x.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/c6x/include/asm/pgtable.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/c6x/include/asm/pgtable.h b/arch/c6x/include/asm/pgtable.h
index ec4db6df5e0d..d532b7df9001 100644
--- a/arch/c6x/include/asm/pgtable.h
+++ b/arch/c6x/include/asm/pgtable.h
@@ -26,6 +26,7 @@
 #define pgd_present(pgd)	(1)
 #define pgd_none(pgd)		(0)
 #define pgd_bad(pgd)		(0)
+#define pgd_large(pgd)		(0)
 #define pgd_clear(pgdp)
 #define kern_addr_valid(addr) (1)
 
@@ -34,6 +35,7 @@
 #define pmd_present(x)		(pmd_val(x))
 #define pmd_clear(xp)		do { set_pmd(xp, __pmd(0)); } while (0)
 #define pmd_bad(x)		(pmd_val(x) & ~PAGE_MASK)
+#define pmd_large(pgd)		(0)
 
 #define PAGE_NONE		__pgprot(0)    /* these mean nothing to NO_MM */
 #define PAGE_SHARED		__pgprot(0)    /* these mean nothing to NO_MM */
-- 
2.20.1