The patch titled
Subject: mm: introduce ARCH_HAS_PTE_SPECIAL
has been added to the -mm tree. Its filename is
mm-introduce-arch_has_pte_special.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-introduce-arch_has_pte_special.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-introduce-arch_has_pte_special.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
Subject: mm: introduce ARCH_HAS_PTE_SPECIAL
Currently the PTE special supports is turned on in per architecture header
files. Most of the time, it is defined in arch/*/include/asm/pgtable.h
depending or not on some other per architecture static definition.
This patch introduce a new configuration variable to manage this directly
in the Kconfig files. It would later replace __HAVE_ARCH_PTE_SPECIAL.
Here notes for some architecture where the definition of
__HAVE_ARCH_PTE_SPECIAL is not obvious:
arm
__HAVE_ARCH_PTE_SPECIAL which is currently defined in
arch/arm/include/asm/pgtable-3level.h which is included by
arch/arm/include/asm/pgtable.h when CONFIG_ARM_LPAE is set.
So select ARCH_HAS_PTE_SPECIAL if ARM_LPAE.
powerpc
__HAVE_ARCH_PTE_SPECIAL is defined in 2 files:
- arch/powerpc/include/asm/book3s/64/pgtable.h
- arch/powerpc/include/asm/pte-common.h
The first one is included if (PPC_BOOK3S & PPC64) while the second is
included in all the other cases.
So select ARCH_HAS_PTE_SPECIAL all the time.
sparc:
__HAVE_ARCH_PTE_SPECIAL is defined if defined(__sparc__) &&
defined(__arch64__) which are defined through the compiler in
sparc/Makefile if !SPARC32 which I assume to be if SPARC64.
So select ARCH_HAS_PTE_SPECIAL if SPARC64
There is no functional change introduced by this patch.
Link: http://lkml.kernel.org/r/1523433816-14460-2-git-send-email-ldufour@xxxxxxxxxxxxxxxxxx
Signed-off-by: Laurent Dufour <ldufour@xxxxxxxxxxxxxxxxxx>
Suggested-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Reviewed-by: Jerome Glisse <jglisse@xxxxxxxxxx>
Acked-by: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
Cc: Michael Ellerman <mpe@xxxxxxxxxxxxxx>
Cc: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Jonathan Corbet <corbet@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Yoshinori Sato <ysato@xxxxxxxxxxxxxxxxxxxx>
Cc: Rich Felker <dalias@xxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Vineet Gupta <vgupta@xxxxxxxxxxxx>
Cc: Palmer Dabbelt <palmer@xxxxxxxxxx>
Cc: Albert Ou <albert@xxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Heiko Carstens <heiko.carstens@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Christophe LEROY <christophe.leroy@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/features/vm/pte_special/arch-support.txt | 2 +-
arch/arc/Kconfig | 1 +
arch/arc/include/asm/pgtable.h | 2 --
arch/arm/Kconfig | 1 +
arch/arm/include/asm/pgtable-3level.h | 1 -
arch/arm64/Kconfig | 1 +
arch/arm64/include/asm/pgtable.h | 2 --
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/book3s/64/pgtable.h | 3 ---
arch/powerpc/include/asm/pte-common.h | 3 ---
arch/riscv/Kconfig | 1 +
arch/riscv/include/asm/pgtable-bits.h | 3 ---
arch/s390/Kconfig | 1 +
arch/s390/include/asm/pgtable.h | 1 -
arch/sh/Kconfig | 1 +
arch/sh/include/asm/pgtable.h | 2 --
arch/sparc/Kconfig | 1 +
arch/sparc/include/asm/pgtable_64.h | 3 ---
arch/x86/Kconfig | 1 +
arch/x86/include/asm/pgtable_types.h | 1 -
include/linux/pfn_t.h | 4 ++--
mm/Kconfig | 3 +++
mm/gup.c | 4 ++--
mm/memory.c | 2 +-
24 files changed, 18 insertions(+), 27 deletions(-)
diff -puN arch/arc/include/asm/pgtable.h~mm-introduce-arch_has_pte_special arch/arc/include/asm/pgtable.h
--- a/arch/arc/include/asm/pgtable.h~mm-introduce-arch_has_pte_special
+++ a/arch/arc/include/asm/pgtable.h
@@ -320,8 +320,6 @@ PTE_BIT_FUNC(mkexec, |= (_PAGE_EXECUTE))
PTE_BIT_FUNC(mkspecial, |= (_PAGE_SPECIAL));
PTE_BIT_FUNC(mkhuge, |= (_PAGE_HW_SZ));
-#define __HAVE_ARCH_PTE_SPECIAL
-
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
{
return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot));
diff -puN arch/arc/Kconfig~mm-introduce-arch_has_pte_special arch/arc/Kconfig
--- a/arch/arc/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/arc/Kconfig
@@ -44,6 +44,7 @@ config ARC
select HAVE_GENERIC_DMA_COHERENT
select HAVE_KERNEL_GZIP
select HAVE_KERNEL_LZMA
+ select ARCH_HAS_PTE_SPECIAL
config MIGHT_HAVE_PCI
bool
diff -puN arch/arm64/include/asm/pgtable.h~mm-introduce-arch_has_pte_special arch/arm64/include/asm/pgtable.h
--- a/arch/arm64/include/asm/pgtable.h~mm-introduce-arch_has_pte_special
+++ a/arch/arm64/include/asm/pgtable.h
@@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a,
#define HPAGE_MASK (~(HPAGE_SIZE - 1))
#define HUGETLB_PAGE_ORDER (HPAGE_SHIFT - PAGE_SHIFT)
-#define __HAVE_ARCH_PTE_SPECIAL
-
static inline pte_t pgd_pte(pgd_t pgd)
{
return __pte(pgd_val(pgd));
diff -puN arch/arm64/Kconfig~mm-introduce-arch_has_pte_special arch/arm64/Kconfig
--- a/arch/arm64/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/arm64/Kconfig
@@ -17,6 +17,7 @@ config ARM64
select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
select ARCH_HAS_KCOV
select ARCH_HAS_MEMBARRIER_SYNC_CORE
+ select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_SG_CHAIN
select ARCH_HAS_STRICT_KERNEL_RWX
diff -puN arch/arm/include/asm/pgtable-3level.h~mm-introduce-arch_has_pte_special arch/arm/include/asm/pgtable-3level.h
--- a/arch/arm/include/asm/pgtable-3level.h~mm-introduce-arch_has_pte_special
+++ a/arch/arm/include/asm/pgtable-3level.h
@@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t
pte_val(pte) |= L_PTE_SPECIAL;
return pte;
}
-#define __HAVE_ARCH_PTE_SPECIAL
#define pmd_write(pmd) (pmd_isclear((pmd), L_PMD_SECT_RDONLY))
#define pmd_dirty(pmd) (pmd_isset((pmd), L_PMD_SECT_DIRTY))
diff -puN arch/arm/Kconfig~mm-introduce-arch_has_pte_special arch/arm/Kconfig
--- a/arch/arm/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/arm/Kconfig
@@ -8,6 +8,7 @@ config ARM
select ARCH_HAS_DEVMEM_IS_ALLOWED
select ARCH_HAS_ELF_RANDOMIZE
select ARCH_HAS_FORTIFY_SOURCE
+ select ARCH_HAS_PTE_SPECIAL if ARM_LPAE
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_STRICT_KERNEL_RWX if MMU && !XIP_KERNEL
diff -puN arch/powerpc/include/asm/book3s/64/pgtable.h~mm-introduce-arch_has_pte_special arch/powerpc/include/asm/book3s/64/pgtable.h
--- a/arch/powerpc/include/asm/book3s/64/pgtable.h~mm-introduce-arch_has_pte_special
+++ a/arch/powerpc/include/asm/book3s/64/pgtable.h
@@ -319,9 +319,6 @@ extern unsigned long pci_io_base;
/* Advertise special mapping type for AGP */
#define HAVE_PAGE_AGP
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
#ifndef __ASSEMBLY__
/*
diff -puN arch/powerpc/include/asm/pte-common.h~mm-introduce-arch_has_pte_special arch/powerpc/include/asm/pte-common.h
--- a/arch/powerpc/include/asm/pte-common.h~mm-introduce-arch_has_pte_special
+++ a/arch/powerpc/include/asm/pte-common.h
@@ -216,9 +216,6 @@ static inline bool pte_user(pte_t pte)
#define PAGE_AGP (PAGE_KERNEL_NC)
#define HAVE_PAGE_AGP
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
#ifndef _PAGE_READ
/* if not defined, we should not find _PAGE_WRITE too */
#define _PAGE_READ 0
diff -puN arch/powerpc/Kconfig~mm-introduce-arch_has_pte_special arch/powerpc/Kconfig
--- a/arch/powerpc/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/powerpc/Kconfig
@@ -141,6 +141,7 @@ config PPC
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_PHYS_TO_DMA
select ARCH_HAS_PMEM_API if PPC64
+ select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_MEMBARRIER_CALLBACKS
select ARCH_HAS_SCALED_CPUTIME if VIRT_CPU_ACCOUNTING_NATIVE
select ARCH_HAS_SG_CHAIN
diff -puN arch/riscv/include/asm/pgtable-bits.h~mm-introduce-arch_has_pte_special arch/riscv/include/asm/pgtable-bits.h
--- a/arch/riscv/include/asm/pgtable-bits.h~mm-introduce-arch_has_pte_special
+++ a/arch/riscv/include/asm/pgtable-bits.h
@@ -42,7 +42,4 @@
_PAGE_WRITE | _PAGE_EXEC | \
_PAGE_USER | _PAGE_GLOBAL))
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
#endif /* _ASM_RISCV_PGTABLE_BITS_H */
diff -puN arch/riscv/Kconfig~mm-introduce-arch_has_pte_special arch/riscv/Kconfig
--- a/arch/riscv/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/riscv/Kconfig
@@ -34,6 +34,7 @@ config RISCV
select THREAD_INFO_IN_TASK
select RISCV_TIMER
select GENERIC_IRQ_MULTI_HANDLER
+ select ARCH_HAS_PTE_SPECIAL
config MMU
def_bool y
diff -puN arch/s390/include/asm/pgtable.h~mm-introduce-arch_has_pte_special arch/s390/include/asm/pgtable.h
--- a/arch/s390/include/asm/pgtable.h~mm-introduce-arch_has_pte_special
+++ a/arch/s390/include/asm/pgtable.h
@@ -171,7 +171,6 @@ static inline int is_module_addr(void *a
#define _PAGE_WRITE 0x020 /* SW pte write bit */
#define _PAGE_SPECIAL 0x040 /* SW associated with special page */
#define _PAGE_UNUSED 0x080 /* SW bit for pgste usage state */
-#define __HAVE_ARCH_PTE_SPECIAL
#ifdef CONFIG_MEM_SOFT_DIRTY
#define _PAGE_SOFT_DIRTY 0x002 /* SW pte soft dirty bit */
diff -puN arch/s390/Kconfig~mm-introduce-arch_has_pte_special arch/s390/Kconfig
--- a/arch/s390/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/s390/Kconfig
@@ -72,6 +72,7 @@ config S390
select ARCH_HAS_GCOV_PROFILE_ALL
select ARCH_HAS_GIGANTIC_PAGE if (MEMORY_ISOLATION && COMPACTION) || CMA
select ARCH_HAS_KCOV
+ select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_SET_MEMORY
select ARCH_HAS_SG_CHAIN
select ARCH_HAS_STRICT_KERNEL_RWX
diff -puN arch/sh/include/asm/pgtable.h~mm-introduce-arch_has_pte_special arch/sh/include/asm/pgtable.h
--- a/arch/sh/include/asm/pgtable.h~mm-introduce-arch_has_pte_special
+++ a/arch/sh/include/asm/pgtable.h
@@ -156,8 +156,6 @@ extern void page_table_range_init(unsign
#define HAVE_ARCH_UNMAPPED_AREA
#define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN
-#define __HAVE_ARCH_PTE_SPECIAL
-
#include <asm-generic/pgtable.h>
#endif /* __ASM_SH_PGTABLE_H */
diff -puN arch/sh/Kconfig~mm-introduce-arch_has_pte_special arch/sh/Kconfig
--- a/arch/sh/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/sh/Kconfig
@@ -50,6 +50,7 @@ config SUPERH
select HAVE_ARCH_AUDITSYSCALL
select HAVE_FUTEX_CMPXCHG if FUTEX
select HAVE_NMI
+ select ARCH_HAS_PTE_SPECIAL
help
The SuperH is a RISC processor targeted for use in embedded systems
and consumer electronics; it was also used in the Sega Dreamcast
diff -puN arch/sparc/include/asm/pgtable_64.h~mm-introduce-arch_has_pte_special arch/sparc/include/asm/pgtable_64.h
--- a/arch/sparc/include/asm/pgtable_64.h~mm-introduce-arch_has_pte_special
+++ a/arch/sparc/include/asm/pgtable_64.h
@@ -117,9 +117,6 @@ bool kern_addr_valid(unsigned long addr)
#define _PAGE_PMD_HUGE _AC(0x0100000000000000,UL) /* Huge page */
#define _PAGE_PUD_HUGE _PAGE_PMD_HUGE
-/* Advertise support for _PAGE_SPECIAL */
-#define __HAVE_ARCH_PTE_SPECIAL
-
/* SUN4U pte bits... */
#define _PAGE_SZ4MB_4U _AC(0x6000000000000000,UL) /* 4MB Page */
#define _PAGE_SZ512K_4U _AC(0x4000000000000000,UL) /* 512K Page */
diff -puN arch/sparc/Kconfig~mm-introduce-arch_has_pte_special arch/sparc/Kconfig
--- a/arch/sparc/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/sparc/Kconfig
@@ -86,6 +86,7 @@ config SPARC64
select ARCH_USE_QUEUED_SPINLOCKS
select GENERIC_TIME_VSYSCALL
select ARCH_CLOCKSOURCE_DATA
+ select ARCH_HAS_PTE_SPECIAL
config ARCH_DEFCONFIG
string
diff -puN arch/x86/include/asm/pgtable_types.h~mm-introduce-arch_has_pte_special arch/x86/include/asm/pgtable_types.h
--- a/arch/x86/include/asm/pgtable_types.h~mm-introduce-arch_has_pte_special
+++ a/arch/x86/include/asm/pgtable_types.h
@@ -65,7 +65,6 @@
#define _PAGE_PKEY_BIT2 (_AT(pteval_t, 0))
#define _PAGE_PKEY_BIT3 (_AT(pteval_t, 0))
#endif
-#define __HAVE_ARCH_PTE_SPECIAL
#define _PAGE_PKEY_MASK (_PAGE_PKEY_BIT0 | \
_PAGE_PKEY_BIT1 | \
diff -puN arch/x86/Kconfig~mm-introduce-arch_has_pte_special arch/x86/Kconfig
--- a/arch/x86/Kconfig~mm-introduce-arch_has_pte_special
+++ a/arch/x86/Kconfig
@@ -57,6 +57,7 @@ config X86
select ARCH_HAS_KCOV if X86_64
select ARCH_HAS_MEMBARRIER_SYNC_CORE
select ARCH_HAS_PMEM_API if X86_64
+ select ARCH_HAS_PTE_SPECIAL
select ARCH_HAS_REFCOUNT
select ARCH_HAS_UACCESS_FLUSHCACHE if X86_64
select ARCH_HAS_SET_MEMORY
diff -puN Documentation/features/vm/pte_special/arch-support.txt~mm-introduce-arch_has_pte_special Documentation/features/vm/pte_special/arch-support.txt
--- a/Documentation/features/vm/pte_special/arch-support.txt~mm-introduce-arch_has_pte_special
+++ a/Documentation/features/vm/pte_special/arch-support.txt
@@ -1,6 +1,6 @@
#
# Feature name: pte_special
-# Kconfig: __HAVE_ARCH_PTE_SPECIAL
+# Kconfig: ARCH_HAS_PTE_SPECIAL
# description: arch supports the pte_special()/pte_mkspecial() VM APIs
#
-----------------------
diff -puN include/linux/pfn_t.h~mm-introduce-arch_has_pte_special include/linux/pfn_t.h
--- a/include/linux/pfn_t.h~mm-introduce-arch_has_pte_special
+++ a/include/linux/pfn_t.h
@@ -122,7 +122,7 @@ pud_t pud_mkdevmap(pud_t pud);
#endif
#endif /* __HAVE_ARCH_PTE_DEVMAP */
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
static inline bool pfn_t_special(pfn_t pfn)
{
return (pfn.val & PFN_SPECIAL) == PFN_SPECIAL;
@@ -132,5 +132,5 @@ static inline bool pfn_t_special(pfn_t p
{
return false;
}
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
#endif /* _LINUX_PFN_T_H_ */
diff -puN mm/gup.c~mm-introduce-arch_has_pte_special mm/gup.c
--- a/mm/gup.c~mm-introduce-arch_has_pte_special
+++ a/mm/gup.c
@@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, in
}
}
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
static int gup_pte_range(pmd_t pmd, unsigned long addr, unsigned long end,
int write, struct page **pages, int *nr)
{
@@ -1427,7 +1427,7 @@ static int gup_pte_range(pmd_t pmd, unsi
{
return 0;
}
-#endif /* __HAVE_ARCH_PTE_SPECIAL */
+#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */
#if defined(__HAVE_ARCH_PTE_DEVMAP) && defined(CONFIG_TRANSPARENT_HUGEPAGE)
static int __gup_device_huge(unsigned long pfn, unsigned long addr,
diff -puN mm/Kconfig~mm-introduce-arch_has_pte_special mm/Kconfig
--- a/mm/Kconfig~mm-introduce-arch_has_pte_special
+++ a/mm/Kconfig
@@ -752,3 +752,6 @@ config GUP_BENCHMARK
performance of get_user_pages_fast().
See tools/testing/selftests/vm/gup_benchmark.c
+
+config ARCH_HAS_PTE_SPECIAL
+ bool
diff -puN mm/memory.c~mm-introduce-arch_has_pte_special mm/memory.c
--- a/mm/memory.c~mm-introduce-arch_has_pte_special
+++ a/mm/memory.c
@@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area
* PFNMAP mappings in order to support COWable mappings.
*
*/
-#ifdef __HAVE_ARCH_PTE_SPECIAL
+#ifdef CONFIG_ARCH_HAS_PTE_SPECIAL
# define HAVE_PTE_SPECIAL 1
#else
# define HAVE_PTE_SPECIAL 0
_
Patches currently in -mm which might be from ldufour@xxxxxxxxxxxxxxxxxx are
mm-introduce-arch_has_pte_special.patch
mm-remove-odd-have_pte_special.patch
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