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Violators will be prosecuted; Wed, 11 Apr 2018 09:03:43 +0100 Received: from d06av25.portsmouth.uk.ibm.com (d06av25.portsmouth.uk.ibm.com [9.149.105.61]) by b06cxnps4076.portsmouth.uk.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id w3B83hbE49610760; Wed, 11 Apr 2018 08:03:43 GMT Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 8088311C052; Wed, 11 Apr 2018 08:55:48 +0100 (BST) Received: from d06av25.portsmouth.uk.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 266CD11C058; Wed, 11 Apr 2018 08:55:46 +0100 (BST) Received: from nimbus.lab.toulouse-stg.fr.ibm.com (unknown [9.145.77.191]) by d06av25.portsmouth.uk.ibm.com (Postfix) with ESMTP; Wed, 11 Apr 2018 08:55:46 +0100 (BST) From: Laurent Dufour To: linux-kernel@vger.kernel.org, linux-mm@kvack.org, linuxppc-dev@lists.ozlabs.org, x86@kernel.org, linux-doc@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, Jerome Glisse , mhocko@kernel.org, aneesh.kumar@linux.vnet.ibm.com, akpm@linux-foundation.org, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, Jonathan Corbet , Catalin Marinas , Will Deacon , Yoshinori Sato , Rich Felker , "David S . Miller" , Thomas Gleixner , Ingo Molnar , Vineet Gupta , Palmer Dabbelt , Albert Ou , Martin Schwidefsky , Heiko Carstens , David Rientjes , Robin Murphy Subject: [PATCH v3 1/2] mm: introduce ARCH_HAS_PTE_SPECIAL Date: Wed, 11 Apr 2018 10:03:35 +0200 X-Mailer: git-send-email 2.7.4 In-Reply-To: <1523433816-14460-1-git-send-email-ldufour@linux.vnet.ibm.com> References: <1523433816-14460-1-git-send-email-ldufour@linux.vnet.ibm.com> X-TM-AS-GCONF: 00 x-cbid: 18041108-0012-0000-0000-000005C97AF4 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 18041108-0013-0000-0000-00001945A9C2 Message-Id: <1523433816-14460-2-git-send-email-ldufour@linux.vnet.ibm.com> X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:, , definitions=2018-04-11_04:, , signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 suspectscore=0 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1709140000 definitions=main-1804110079 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20180411_010415_889641_A8019294 X-CRM114-Status: GOOD ( 29.74 ) X-Spam-Score: -0.7 (/) X-Spam-Report: SpamAssassin version 3.4.1 on bombadil.infradead.org summary: Content analysis details: (-0.7 points) pts rule name description ---- ---------------------- -------------------------------------------------- -0.7 RCVD_IN_DNSWL_LOW RBL: Sender listed at http://www.dnswl.org/, low trust [148.163.158.5 listed in list.dnswl.org] X-BeenThere: linux-snps-arc@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Linux on Synopsys ARC Processors List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-snps-arc" Errors-To: linux-snps-arc-bounces+incoming=patchwork.ozlabs.org@lists.infradead.org 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. Suggested-by: Jerome Glisse Reviewed-by: Jerome Glisse Acked-by: David Rientjes Signed-off-by: Laurent Dufour --- 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 --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt index 055004f467d2..cd05924ea875 100644 --- a/Documentation/features/vm/pte_special/arch-support.txt +++ b/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 --git a/arch/arc/Kconfig b/arch/arc/Kconfig index d76bf4a83740..8516e2b0239a 100644 --- a/arch/arc/Kconfig +++ b/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 --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h index 08fe33830d4b..8ec5599a0957 100644 --- a/arch/arc/include/asm/pgtable.h +++ b/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 --git a/arch/arm/Kconfig b/arch/arm/Kconfig index a7f8e7f4b88f..c088c851b235 100644 --- a/arch/arm/Kconfig +++ b/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 --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h index 2a4836087358..6d50a11d7793 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -219,7 +219,6 @@ static inline pte_t pte_mkspecial(pte_t pte) 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 --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index eb2cf4938f6d..9a3f1b1ab50c 100644 --- a/arch/arm64/Kconfig +++ b/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 --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index 7e2c27e63cd8..b96c8a186908 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -306,8 +306,6 @@ static inline int pte_same(pte_t pte_a, pte_t pte_b) #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 --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index c32a181a7cbb..f7415fe25c07 100644 --- a/arch/powerpc/Kconfig +++ b/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 --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index 47b5ffc8715d..b3ac8948b257 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/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 --git a/arch/powerpc/include/asm/pte-common.h b/arch/powerpc/include/asm/pte-common.h index c4a72c7a8c83..03dfddb1f49a 100644 --- a/arch/powerpc/include/asm/pte-common.h +++ b/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 --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 23d8acca5c90..92d331ea11bd 100644 --- a/arch/riscv/Kconfig +++ b/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 --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h index 997ddbb1d370..2fa2942be221 100644 --- a/arch/riscv/include/asm/pgtable-bits.h +++ b/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 --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 32a0d5b958bf..5f1f4997e7e9 100644 --- a/arch/s390/Kconfig +++ b/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 --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index 2d24d33bf188..9809694e1389 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -171,7 +171,6 @@ static inline int is_module_addr(void *addr) #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 --git a/arch/sh/Kconfig b/arch/sh/Kconfig index 97fe29316476..a6c75b6806d2 100644 --- a/arch/sh/Kconfig +++ b/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 --git a/arch/sh/include/asm/pgtable.h b/arch/sh/include/asm/pgtable.h index 89c513a982fc..f6abfe2bca93 100644 --- a/arch/sh/include/asm/pgtable.h +++ b/arch/sh/include/asm/pgtable.h @@ -156,8 +156,6 @@ extern void page_table_range_init(unsigned long start, unsigned long end, #define HAVE_ARCH_UNMAPPED_AREA #define HAVE_ARCH_UNMAPPED_AREA_TOPDOWN -#define __HAVE_ARCH_PTE_SPECIAL - #include #endif /* __ASM_SH_PGTABLE_H */ diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index 8767e45f1b2b..6b5a4f05dcb2 100644 --- a/arch/sparc/Kconfig +++ b/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 --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 44d6ac47e035..1393a8ac596b 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/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 --git a/arch/x86/Kconfig b/arch/x86/Kconfig index d8983df5a2bc..2399c8ce02be 100644 --- a/arch/x86/Kconfig +++ b/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 --git a/arch/x86/include/asm/pgtable_types.h b/arch/x86/include/asm/pgtable_types.h index 1e5a40673953..99fff853c944 100644 --- a/arch/x86/include/asm/pgtable_types.h +++ b/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 --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h index a03c2642a87c..21713dc14ce2 100644 --- a/include/linux/pfn_t.h +++ b/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 pfn) { return false; } -#endif /* __HAVE_ARCH_PTE_SPECIAL */ +#endif /* CONFIG_ARCH_HAS_PTE_SPECIAL */ #endif /* _LINUX_PFN_T_H_ */ diff --git a/mm/Kconfig b/mm/Kconfig index d5004d82a1d6..1ea3e4a6a123 100644 --- a/mm/Kconfig +++ b/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 --git a/mm/gup.c b/mm/gup.c index 76af4cfeaf68..d19bfbadd32a 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -1351,7 +1351,7 @@ static void undo_dev_pagemap(int *nr, int nr_start, struct page **pages) } } -#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, unsigned long addr, unsigned long end, { 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 --git a/mm/memory.c b/mm/memory.c index a1f990e33e38..96910c625daa 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -817,7 +817,7 @@ static void print_bad_pte(struct vm_area_struct *vma, unsigned long addr, * 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