linux-kernel - [PATCH v3 15/34] parisc: mm: Add p?d

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Date:   Wed, 27 Feb 2019 17:05:49 +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>,
        "James E.J. Bottomley" <jejb@...isc-linux.org>,
        Helge Deller <deller@....de>, linux-parisc@...r.kernel.org
Subject: [PATCH v3 15/34] parisc: 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 parisc, we don't support large pages, so add stubs returning 0.

CC: "James E.J. Bottomley" <jejb@...isc-linux.org>
CC: Helge Deller <deller@....de>
CC: linux-parisc@...r.kernel.org
Signed-off-by: Steven Price <steven.price@....com>
---
 arch/parisc/include/asm/pgtable.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index c7bb74e22436..1f38c85a9530 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -302,6 +302,7 @@ extern unsigned long *empty_zero_page;
 #endif
 #define pmd_bad(x)	(!(pmd_flag(x) & PxD_FLAG_VALID))
 #define pmd_present(x)	(pmd_flag(x) & PxD_FLAG_PRESENT)
+#define pmd_large(x)	(0)
 static inline void pmd_clear(pmd_t *pmd) {
 #if CONFIG_PGTABLE_LEVELS == 3
 	if (pmd_flag(*pmd) & PxD_FLAG_ATTACHED)
@@ -324,6 +325,7 @@ static inline void pmd_clear(pmd_t *pmd) {
 #define pgd_none(x)     (!pgd_val(x))
 #define pgd_bad(x)      (!(pgd_flag(x) & PxD_FLAG_VALID))
 #define pgd_present(x)  (pgd_flag(x) & PxD_FLAG_PRESENT)
+#define pgd_large(x)	(0)
 static inline void pgd_clear(pgd_t *pgd) {
 #if CONFIG_PGTABLE_LEVELS == 3
 	if(pgd_flag(*pgd) & PxD_FLAG_ATTACHED)
@@ -342,6 +344,7 @@ static inline void pgd_clear(pgd_t *pgd) {
 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; }
 static inline void pgd_clear(pgd_t * pgdp)	{ }
 #endif
 
-- 
2.20.1