[PATCH V2] mm/special: Create generic fallbacks for pte_special() and pte_mkspecial()

Anshuman Khandual
2020-03-10T01:09:38Z

Currently there are many platforms that dont enable ARCH_HAS_PTE_SPECIAL
but required to define quite similar fallback stubs for special page table
entry helpers such as pte_special() and pte_mkspecial(), as they get build
in generic MM without a config check. This creates two generic fallback
stub definitions for these helpers, eliminating much code duplication.

mips platform has a special case where pte_special() and pte_mkspecial()
visibility is wider than what ARCH_HAS_PTE_SPECIAL enablement requires.
This restricts those symbol visibility in order to avoid redefinitions
which is now exposed through this new generic stubs and subsequent build
failure. arm platform set_pte_at() definition needs to be moved into a C
file just to prevent a build failure.

Cc: Richard Henderson <rth@twiddle.net>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Russell King <linux@armlinux.org.uk>
Cc: Guo Ren <guoren@kernel.org>
Cc: Brian Cain <bcain@codeaurora.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Sam Creasey <sammy@sammy.net>
Cc: Michal Simek <monstr@monstr.eu>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Paul Burton <paulburton@kernel.org>
Cc: Nick Hu <nickhu@andestech.com>
Cc: Greentime Hu <green.hu@gmail.com>
Cc: Vincent Chen <deanbo422@gmail.com>
Cc: Ley Foon Tan <ley.foon.tan@intel.com>
Cc: Jonas Bonn <jonas@southpole.se>
Cc: Stefan Kristiansson <stefan.kristiansson@saunalahti.fi>
Cc: Stafford Horne <shorne@gmail.com>
Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com>
Cc: Helge Deller <deller@gmx.de>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Jeff Dike <jdike@addtoit.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Guan Xuetao <gxt@pku.edu.cn>
Cc: Chris Zankel <chris@zankel.net>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-alpha@vger.kernel.org
Cc: linux-arm-kernel@lists.infradead.org
Cc: linux-csky@vger.kernel.org
Cc: linux-hexagon@vger.kernel.org
Cc: linux-ia64@vger.kernel.org
Cc: linux-m68k@lists.linux-m68k.org
Cc: linux-mips@vger.kernel.org
Cc: nios2-dev@lists.rocketboards.org
Cc: openrisc@lists.librecores.org
Cc: linux-parisc@vger.kernel.org
Cc: sparclinux@vger.kernel.org
Cc: linux-um@lists.infradead.org
Cc: linux-xtensa@linux-xtensa.org
Cc: linux-arch@vger.kernel.org
Cc: linux-mm@kvack.org
Cc: linux-kernel@vger.kernel.org
Acked-by: Guo Ren <guoren@kernel.org> # csky
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # m68k
Acked-by: Stafford Horne <shorne@gmail.com> # openrisc
Acked-by: Helge Deller <deller@gmx.de> # parisc
Signed-off-by: Anshuman Khandual <anshuman.khandual@arm.com>
---
Build tested on multiple platforms but boot tested only for arm64.

Changes in V2:

- s/HAVE_ARCH_PTE_SPECIAL/ARCH_HAS_PTE_SPECIAL per Geert

Changes in V1: (https://patchwork.kernel.org/patch/11414613/)

arch/alpha/include/asm/pgtable.h | 2 --
arch/arm/include/asm/pgtable-2level.h | 2 --
arch/arm/include/asm/pgtable.h | 15 ++------
arch/arm/mm/mmu.c | 14 ++++++++
arch/csky/include/asm/pgtable.h | 3 --
arch/hexagon/include/asm/pgtable.h | 2 --
arch/ia64/include/asm/pgtable.h | 2 --
arch/m68k/include/asm/mcf_pgtable.h | 10 ------
arch/m68k/include/asm/motorola_pgtable.h | 2 --
arch/m68k/include/asm/sun3_pgtable.h | 2 --
arch/microblaze/include/asm/pgtable.h | 4 ---
arch/mips/include/asm/pgtable.h | 44 ++++++++++++++++--------
arch/nds32/include/asm/pgtable.h | 9 -----
arch/nios2/include/asm/pgtable.h | 3 --
arch/openrisc/include/asm/pgtable.h | 2 --
arch/parisc/include/asm/pgtable.h | 2 --
arch/sparc/include/asm/pgtable_32.h | 7 ----
arch/um/include/asm/pgtable.h | 10 ------
arch/unicore32/include/asm/pgtable.h | 3 --
arch/xtensa/include/asm/pgtable.h | 3 --
include/linux/mm.h | 12 +++++++
21 files changed, 58 insertions(+), 95 deletions(-)

diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h
index 299791ce14b6..0267aa8a4f86 100644
--- a/arch/alpha/include/asm/pgtable.h
+++ b/arch/alpha/include/asm/pgtable.h
@@ -268,7 +268,6 @@ extern inline void pud_clear(pud_t * pudp) { pud_val(*pudp) = 0; }
extern inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_FOW); }
extern inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
extern inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-extern inline int pte_special(pte_t pte) { return 0; }

extern inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_FOW; return pte; }
extern inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~(__DIRTY_BITS); return pte; }
@@ -276,7 +275,6 @@ extern inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~(__ACCESS_BITS); ret
extern inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) &= ~_PAGE_FOW; return pte; }
extern inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= __DIRTY_BITS; return pte; }
extern inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= __ACCESS_BITS; return pte; }
-extern inline pte_t pte_mkspecial(pte_t pte) { return pte; }

#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))

diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h
index 0d3ea35c97fe..9e084a464a97 100644
--- a/arch/arm/include/asm/pgtable-2level.h
+++ b/arch/arm/include/asm/pgtable-2level.h
@@ -211,8 +211,6 @@ static inline pmd_t *pmd_offset(pud_t *pud, unsigned long addr)
#define pmd_addr_end(addr,end) (end)

#define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext)
-#define pte_special(pte) (0)
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }

/*
* We don't have huge page support for short descriptors, for the moment
diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h
index eabcb48a7840..556468240ba5 100644
--- a/arch/arm/include/asm/pgtable.h
+++ b/arch/arm/include/asm/pgtable.h
@@ -252,19 +252,8 @@ static inline void __sync_icache_dcache(pte_t pteval)
extern void __sync_icache_dcache(pte_t pteval);
#endif

-static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
- pte_t *ptep, pte_t pteval)
-{
- unsigned long ext = 0;
-
- if (addr < TASK_SIZE && pte_valid_user(pteval)) {
- if (!pte_special(pteval))
- __sync_icache_dcache(pteval);
- ext |= PTE_EXT_NG;
- }
-
- set_pte_ext(ptep, pteval, ext);
-}
+void set_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pteval);

static inline pte_t clear_pte_bit(pte_t pte, pgprot_t prot)
{
diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c
index 5d0d0f86e790..16e9b041d7cf 100644
--- a/arch/arm/mm/mmu.c
+++ b/arch/arm/mm/mmu.c
@@ -1672,3 +1672,17 @@ void __init early_mm_init(const struct machine_desc *mdesc)
build_mem_type_table();
early_paging_init(mdesc);
}
+
+void set_pte_at(struct mm_struct *mm, unsigned long addr,
+ pte_t *ptep, pte_t pteval)
+{
+ unsigned long ext = 0;
+
+ if (addr < TASK_SIZE && pte_valid_user(pteval)) {
+ if (!pte_special(pteval))
+ __sync_icache_dcache(pteval);
+ ext |= PTE_EXT_NG;
+ }
+
+ set_pte_ext(ptep, pteval, ext);
+}
diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h
index 9b7764cb7645..9ab4a445ad99 100644
--- a/arch/csky/include/asm/pgtable.h
+++ b/arch/csky/include/asm/pgtable.h
@@ -110,9 +110,6 @@ extern unsigned long empty_zero_page[PAGE_SIZE / sizeof(unsigned long)];
extern void load_pgd(unsigned long pg_dir);
extern pte_t invalid_pte_table[PTRS_PER_PTE];

-static inline int pte_special(pte_t pte) { return 0; }
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
static inline void set_pte(pte_t *p, pte_t pte)
{
*p = pte;
diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h
index 2fec20ad939e..d383e8bea5b2 100644
--- a/arch/hexagon/include/asm/pgtable.h
+++ b/arch/hexagon/include/asm/pgtable.h
@@ -158,8 +158,6 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* located in head.S */

/* Seems to be zero even in architectures where the zero page is firewalled? */
#define FIRST_USER_ADDRESS 0UL
-#define pte_special(pte) 0
-#define pte_mkspecial(pte) (pte)

/* HUGETLB not working currently */
#ifdef CONFIG_HUGETLB_PAGE
diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h
index d602e7c622db..0e7b645b76c6 100644
--- a/arch/ia64/include/asm/pgtable.h
+++ b/arch/ia64/include/asm/pgtable.h
@@ -298,7 +298,6 @@ extern unsigned long VMALLOC_END;
#define pte_exec(pte) ((pte_val(pte) & _PAGE_AR_RX) != 0)
#define pte_dirty(pte) ((pte_val(pte) & _PAGE_D) != 0)
#define pte_young(pte) ((pte_val(pte) & _PAGE_A) != 0)
-#define pte_special(pte) 0

/*
* Note: we convert AR_RWX to AR_RX and AR_RW to AR_R by clearing the 2nd bit in the
@@ -311,7 +310,6 @@ extern unsigned long VMALLOC_END;
#define pte_mkclean(pte) (__pte(pte_val(pte) & ~_PAGE_D))
#define pte_mkdirty(pte) (__pte(pte_val(pte) | _PAGE_D))
#define pte_mkhuge(pte) (__pte(pte_val(pte)))
-#define pte_mkspecial(pte) (pte)

/*
* Because ia64's Icache and Dcache is not coherent (on a cpu), we need to
diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h
index b9f45aeded25..0031cd387b75 100644
--- a/arch/m68k/include/asm/mcf_pgtable.h
+++ b/arch/m68k/include/asm/mcf_pgtable.h
@@ -235,11 +235,6 @@ static inline int pte_young(pte_t pte)
return pte_val(pte) & CF_PAGE_ACCESSED;
}

-static inline int pte_special(pte_t pte)
-{
- return 0;
-}
-
static inline pte_t pte_wrprotect(pte_t pte)
{
pte_val(pte) &= ~CF_PAGE_WRITABLE;
@@ -312,11 +307,6 @@ static inline pte_t pte_mkcache(pte_t pte)
return pte;
}

-static inline pte_t pte_mkspecial(pte_t pte)
-{
- return pte;
-}
-
#define swapper_pg_dir kernel_pg_dir
extern pgd_t kernel_pg_dir[PTRS_PER_PGD];

diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h
index 62bedc61f110..a6f4b96d674e 100644
--- a/arch/m68k/include/asm/motorola_pgtable.h
+++ b/arch/m68k/include/asm/motorola_pgtable.h
@@ -168,7 +168,6 @@ static inline void pud_set(pud_t *pudp, pmd_t *pmdp)
static inline int pte_write(pte_t pte) { return !(pte_val(pte) & _PAGE_RONLY); }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }

static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) |= _PAGE_RONLY; return pte; }
static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
@@ -186,7 +185,6 @@ static inline pte_t pte_mkcache(pte_t pte)
pte_val(pte) = (pte_val(pte) & _CACHEMASK040) | m68k_supervisor_cachemode;
return pte;
}
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }

#define PAGE_DIR_OFFSET(tsk,address) pgd_offset((tsk),(address))

diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h
index bc4155264810..0caa18a08437 100644
--- a/arch/m68k/include/asm/sun3_pgtable.h
+++ b/arch/m68k/include/asm/sun3_pgtable.h
@@ -155,7 +155,6 @@ static inline void pmd_clear (pmd_t *pmdp) { pmd_val (*pmdp) = 0; }
static inline int pte_write(pte_t pte) { return pte_val(pte) & SUN3_PAGE_WRITEABLE; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & SUN3_PAGE_MODIFIED; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & SUN3_PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }

static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_WRITEABLE; return pte; }
static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~SUN3_PAGE_MODIFIED; return pte; }
@@ -168,7 +167,6 @@ static inline pte_t pte_mknocache(pte_t pte) { pte_val(pte) |= SUN3_PAGE_NOCACHE
//static inline pte_t pte_mkcache(pte_t pte) { pte_val(pte) &= SUN3_PAGE_NOCACHE; return pte; }
// until then, use:
static inline pte_t pte_mkcache(pte_t pte) { return pte; }
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }

extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
extern pgd_t kernel_pg_dir[PTRS_PER_PGD];
diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h
index 2def331f9e2c..db9bdfcf46b7 100644
--- a/arch/microblaze/include/asm/pgtable.h
+++ b/arch/microblaze/include/asm/pgtable.h
@@ -80,10 +80,6 @@ extern pte_t *va_to_pte(unsigned long address);
* Undefined behaviour if not..
*/

-static inline int pte_special(pte_t pte) { return 0; }
-
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
/* Start and end of the vmalloc area. */
/* Make sure to map the vmalloc area above the pinned kernel memory area
of 32Mb. */
diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h
index aef5378f909c..8e4e4be1ca00 100644
--- a/arch/mips/include/asm/pgtable.h
+++ b/arch/mips/include/asm/pgtable.h
@@ -269,6 +269,36 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr,
*/
extern pgd_t swapper_pg_dir[];

+/*
+ * Platform specific pte_special() and pte_mkspecial() definitions
+ * are required only when ARCH_HAS_PTE_SPECIAL is enabled.
+ */
+#if !defined(CONFIG_32BIT) && !defined(CONFIG_CPU_HAS_RIXI)
+#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32)
+static inline int pte_special(pte_t pte)
+{
+ return pte.pte_low & _PAGE_SPECIAL;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ pte.pte_low |= _PAGE_SPECIAL;
+ return pte;
+}
+#else
+static inline int pte_special(pte_t pte)
+{
+ return pte_val(pte) & _PAGE_SPECIAL;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ pte_val(pte) |= _PAGE_SPECIAL;
+ return pte;
+}
+#endif
+#endif
+
/*
* The following only work if pte_present() is true.
* Undefined behaviour if not..
@@ -277,7 +307,6 @@ extern pgd_t swapper_pg_dir[];
static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return pte.pte_low & _PAGE_SPECIAL; }

static inline pte_t pte_wrprotect(pte_t pte)
{
@@ -338,17 +367,10 @@ static inline pte_t pte_mkyoung(pte_t pte)
}
return pte;
}
-
-static inline pte_t pte_mkspecial(pte_t pte)
-{
- pte.pte_low |= _PAGE_SPECIAL;
- return pte;
-}
#else
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return pte_val(pte) & _PAGE_SPECIAL; }

static inline pte_t pte_wrprotect(pte_t pte)
{
@@ -392,12 +414,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
return pte;
}

-static inline pte_t pte_mkspecial(pte_t pte)
-{
- pte_val(pte) |= _PAGE_SPECIAL;
- return pte;
-}
-
#ifdef CONFIG_MIPS_HUGE_TLB_SUPPORT
static inline int pte_huge(pte_t pte) { return pte_val(pte) & _PAGE_HUGE; }

diff --git a/arch/nds32/include/asm/pgtable.h b/arch/nds32/include/asm/pgtable.h
index 6abc58ac406d..476cc4dd1709 100644
--- a/arch/nds32/include/asm/pgtable.h
+++ b/arch/nds32/include/asm/pgtable.h
@@ -286,15 +286,6 @@ PTE_BIT_FUNC(mkclean, &=~_PAGE_D);
PTE_BIT_FUNC(mkdirty, |=_PAGE_D);
PTE_BIT_FUNC(mkold, &=~_PAGE_YOUNG);
PTE_BIT_FUNC(mkyoung, |=_PAGE_YOUNG);
-static inline int pte_special(pte_t pte)
-{
- return 0;
-}
-
-static inline pte_t pte_mkspecial(pte_t pte)
-{
- return pte;
-}

/*
* Mark the prot value as uncacheable and unbufferable.
diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h
index 99985d8b7166..f98b7f4519ba 100644
--- a/arch/nios2/include/asm/pgtable.h
+++ b/arch/nios2/include/asm/pgtable.h
@@ -113,7 +113,6 @@ static inline int pte_dirty(pte_t pte) \
{ return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) \
{ return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }

#define pgprot_noncached pgprot_noncached

@@ -168,8 +167,6 @@ static inline pte_t pte_mkdirty(pte_t pte)
return pte;
}

-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
static inline pte_t pte_mkyoung(pte_t pte)
{
pte_val(pte) |= _PAGE_ACCESSED;
diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h
index 248d22d8faa7..7f3fb9ceb083 100644
--- a/arch/openrisc/include/asm/pgtable.h
+++ b/arch/openrisc/include/asm/pgtable.h
@@ -236,8 +236,6 @@ static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
static inline int pte_exec(pte_t pte) { return pte_val(pte) & _PAGE_EXEC; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }

static inline pte_t pte_wrprotect(pte_t pte)
{
diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h
index f0a365950536..9832c73a7021 100644
--- a/arch/parisc/include/asm/pgtable.h
+++ b/arch/parisc/include/asm/pgtable.h
@@ -377,7 +377,6 @@ static inline void pud_clear(pud_t *pud) {
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
-static inline int pte_special(pte_t pte) { return 0; }

static inline pte_t pte_mkclean(pte_t pte) { pte_val(pte) &= ~_PAGE_DIRTY; return pte; }
static inline pte_t pte_mkold(pte_t pte) { pte_val(pte) &= ~_PAGE_ACCESSED; return pte; }
@@ -385,7 +384,6 @@ static inline pte_t pte_wrprotect(pte_t pte) { pte_val(pte) &= ~_PAGE_WRITE; ret
static inline pte_t pte_mkdirty(pte_t pte) { pte_val(pte) |= _PAGE_DIRTY; return pte; }
static inline pte_t pte_mkyoung(pte_t pte) { pte_val(pte) |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte) { pte_val(pte) |= _PAGE_WRITE; return pte; }
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }

/*
* Huge pte definitions.
diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h
index 6d6f44c0cad9..0de659ae0ba4 100644
--- a/arch/sparc/include/asm/pgtable_32.h
+++ b/arch/sparc/include/asm/pgtable_32.h
@@ -223,11 +223,6 @@ static inline int pte_young(pte_t pte)
return pte_val(pte) & SRMMU_REF;
}

-static inline int pte_special(pte_t pte)
-{
- return 0;
-}
-
static inline pte_t pte_wrprotect(pte_t pte)
{
return __pte(pte_val(pte) & ~SRMMU_WRITE);
@@ -258,8 +253,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
return __pte(pte_val(pte) | SRMMU_REF);
}

-#define pte_mkspecial(pte) (pte)
-
#define pfn_pte(pfn, prot) mk_pte(pfn_to_page(pfn), prot)

static inline unsigned long pte_pfn(pte_t pte)
diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h
index 2daa58df2190..b5ddf5d98bd5 100644
--- a/arch/um/include/asm/pgtable.h
+++ b/arch/um/include/asm/pgtable.h
@@ -167,11 +167,6 @@ static inline int pte_newprot(pte_t pte)
return(pte_present(pte) && (pte_get_bits(pte, _PAGE_NEWPROT)));
}

-static inline int pte_special(pte_t pte)
-{
- return 0;
-}
-
/*
* =================================
* Flags setting section.
@@ -247,11 +242,6 @@ static inline pte_t pte_mknewpage(pte_t pte)
return(pte);
}

-static inline pte_t pte_mkspecial(pte_t pte)
-{
- return(pte);
-}
-
static inline void set_pte(pte_t *pteptr, pte_t pteval)
{
pte_copy(*pteptr, pteval);
diff --git a/arch/unicore32/include/asm/pgtable.h b/arch/unicore32/include/asm/pgtable.h
index c8f7ba12f309..3b8731b3a937 100644
--- a/arch/unicore32/include/asm/pgtable.h
+++ b/arch/unicore32/include/asm/pgtable.h
@@ -177,7 +177,6 @@ extern struct page *empty_zero_page;
#define pte_dirty(pte) (pte_val(pte) & PTE_DIRTY)
#define pte_young(pte) (pte_val(pte) & PTE_YOUNG)
#define pte_exec(pte) (pte_val(pte) & PTE_EXEC)
-#define pte_special(pte) (0)

#define PTE_BIT_FUNC(fn, op) \
static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
@@ -189,8 +188,6 @@ PTE_BIT_FUNC(mkdirty, |= PTE_DIRTY);
PTE_BIT_FUNC(mkold, &= ~PTE_YOUNG);
PTE_BIT_FUNC(mkyoung, |= PTE_YOUNG);

-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
-
/*
* Mark the prot value as uncacheable.
*/
diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h
index 27ac17c9da09..8be0c0568c50 100644
--- a/arch/xtensa/include/asm/pgtable.h
+++ b/arch/xtensa/include/asm/pgtable.h
@@ -266,7 +266,6 @@ static inline void paging_init(void) { }
static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITABLE; }
static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_DIRTY; }
static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
-static inline int pte_special(pte_t pte) { return 0; }

static inline pte_t pte_wrprotect(pte_t pte)
{ pte_val(pte) &= ~(_PAGE_WRITABLE | _PAGE_HW_WRITE); return pte; }
@@ -280,8 +279,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
{ pte_val(pte) |= _PAGE_ACCESSED; return pte; }
static inline pte_t pte_mkwrite(pte_t pte)
{ pte_val(pte) |= _PAGE_WRITABLE; return pte; }
-static inline pte_t pte_mkspecial(pte_t pte)
- { return pte; }

#define pgprot_noncached(prot) (__pgprot(pgprot_val(prot) & ~_PAGE_CA_MASK))

diff --git a/include/linux/mm.h b/include/linux/mm.h
index c54fb96cb1e6..b2b43c88bff2 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1720,6 +1720,18 @@ static inline void sync_mm_rss(struct mm_struct *mm)
}
#endif

+#ifndef CONFIG_ARCH_HAS_PTE_SPECIAL
+static inline int pte_special(pte_t pte)
+{
+ return 0;
+}
+
+static inline pte_t pte_mkspecial(pte_t pte)
+{
+ return pte;
+}
+#endif
+
#ifndef CONFIG_ARCH_HAS_PTE_DEVMAP
static inline int pte_devmap(pte_t pte)
{
--
2.20.1