From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id B5954C56201 for ; Thu, 29 Oct 2020 16:20:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 5E2202076D for ; Thu, 29 Oct 2020 16:20:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603988405; bh=zI1eI+XhW0lIxg0HHm0ntO6wulEQzC4d9LeaLKLoEbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=wK/QUyw8vL3l2oSESbiOQWGvy4gyEDRjUbKbvREDwyJELINLxggPX+q1pXIDvIJ7A GBd8Gcj8gYR9rmrAcxVid0Hi4H0znl1lKenDn52zKEnyvQE4Urw/DExs73fVRBYArG nzUapwZQVj5egnYsClvim4CI+m7qCC+TBBgdqllc= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726740AbgJ2QUE (ORCPT ); Thu, 29 Oct 2020 12:20:04 -0400 Received: from mail.kernel.org ([198.145.29.99]:42682 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725764AbgJ2QUE (ORCPT ); Thu, 29 Oct 2020 12:20:04 -0400 Received: from aquarius.haifa.ibm.com (nesher1.haifa.il.ibm.com [195.110.40.7]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 17F3720825; Thu, 29 Oct 2020 16:19:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1603988401; bh=zI1eI+XhW0lIxg0HHm0ntO6wulEQzC4d9LeaLKLoEbQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=cQbzoXdNd7+j1ILlDsrzMJ4MqSv34cj/azO2y10t85s1oOWZzB17+JNGy++4fR3pW kb20Xcz8yCK6efwrsKoXrnRuUNHayKvuBTu1LPK5I5mYeDegMb4vqlOGILD9Fl6VXe cvcmWwgGAM+WWRFF+gQyF9Vda7jzHrPpsR3EfwJ4= From: Mike Rapoport To: Andrew Morton Cc: Albert Ou , Andy Lutomirski , Benjamin Herrenschmidt , Borislav Petkov , Catalin Marinas , Christian Borntraeger , Christoph Lameter , "David S. Miller" , Dave Hansen , David Hildenbrand , David Rientjes , "Edgecombe, Rick P" , "H. Peter Anvin" , Heiko Carstens , Ingo Molnar , Joonsoo Kim , "Kirill A. Shutemov" , Len Brown , Michael Ellerman , Mike Rapoport , Mike Rapoport , Palmer Dabbelt , Paul Mackerras , Paul Walmsley , Pavel Machek , Pekka Enberg , Peter Zijlstra , "Rafael J. Wysocki" , Thomas Gleixner , Vasily Gorbik , Will Deacon , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-pm@vger.kernel.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, sparclinux@vger.kernel.org, x86@kernel.org Subject: [PATCH v2 3/4] arch, mm: restore dependency of __kernel_map_pages() of DEBUG_PAGEALLOC Date: Thu, 29 Oct 2020 18:19:01 +0200 Message-Id: <20201029161902.19272-4-rppt@kernel.org> X-Mailer: git-send-email 2.28.0 In-Reply-To: <20201029161902.19272-1-rppt@kernel.org> References: <20201029161902.19272-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Mike Rapoport The design of DEBUG_PAGEALLOC presumes that __kernel_map_pages() must never fail. With this assumption is wouldn't be safe to allow general usage of this function. Moreover, some architectures that implement __kernel_map_pages() have this function guarded by #ifdef DEBUG_PAGEALLOC and some refuse to map/unmap pages when page allocation debugging is disabled at runtime. As all the users of __kernel_map_pages() were converted to use debug_pagealloc_map_pages() it is safe to make it available only when DEBUG_PAGEALLOC is set. Signed-off-by: Mike Rapoport --- arch/Kconfig | 3 +++ arch/arm64/Kconfig | 4 +--- arch/arm64/mm/pageattr.c | 6 ++++-- arch/powerpc/Kconfig | 5 +---- arch/riscv/Kconfig | 4 +--- arch/riscv/include/asm/pgtable.h | 2 -- arch/riscv/mm/pageattr.c | 2 ++ arch/s390/Kconfig | 4 +--- arch/sparc/Kconfig | 4 +--- arch/x86/Kconfig | 4 +--- arch/x86/mm/pat/set_memory.c | 2 ++ include/linux/mm.h | 10 +++++++--- 12 files changed, 24 insertions(+), 26 deletions(-) diff --git a/arch/Kconfig b/arch/Kconfig index 56b6ccc0e32d..56d4752b6db6 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -1028,6 +1028,9 @@ config HAVE_STATIC_CALL_INLINE bool depends on HAVE_STATIC_CALL +config ARCH_SUPPORTS_DEBUG_PAGEALLOC + bool + source "kernel/gcov/Kconfig" source "scripts/gcc-plugins/Kconfig" diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index f858c352f72a..5a01dfb77b93 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -71,6 +71,7 @@ config ARM64 select ARCH_USE_QUEUED_RWLOCKS select ARCH_USE_QUEUED_SPINLOCKS select ARCH_USE_SYM_ANNOTATIONS + select ARCH_SUPPORTS_DEBUG_PAGEALLOC select ARCH_SUPPORTS_MEMORY_FAILURE select ARCH_SUPPORTS_SHADOW_CALL_STACK if CC_HAVE_SHADOW_CALL_STACK select ARCH_SUPPORTS_ATOMIC_RMW @@ -1005,9 +1006,6 @@ config HOLES_IN_ZONE source "kernel/Kconfig.hz" -config ARCH_SUPPORTS_DEBUG_PAGEALLOC - def_bool y - config ARCH_SPARSEMEM_ENABLE def_bool y select SPARSEMEM_VMEMMAP_ENABLE diff --git a/arch/arm64/mm/pageattr.c b/arch/arm64/mm/pageattr.c index 1b94f5b82654..18613d8834db 100644 --- a/arch/arm64/mm/pageattr.c +++ b/arch/arm64/mm/pageattr.c @@ -178,13 +178,15 @@ int set_direct_map_default_noflush(struct page *page) PAGE_SIZE, change_page_range, &data); } +#ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { - if (!debug_pagealloc_enabled() && !rodata_full) + if (!rodata_full) return; set_memory_valid((unsigned long)page_address(page), numpages, enable); } +#endif /* CONFIG_DEBUG_PAGEALLOC */ /* * This function is used to determine if a linear map page has been marked as @@ -204,7 +206,7 @@ bool kernel_page_present(struct page *page) pte_t *ptep; unsigned long addr = (unsigned long)page_address(page); - if (!debug_pagealloc_enabled() && !rodata_full) + if (!rodata_full) return true; pgdp = pgd_offset_k(addr); diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig index e9f13fe08492..ad8a83f3ddca 100644 --- a/arch/powerpc/Kconfig +++ b/arch/powerpc/Kconfig @@ -146,6 +146,7 @@ config PPC select ARCH_MIGHT_HAVE_PC_SERIO select ARCH_OPTIONAL_KERNEL_RWX if ARCH_HAS_STRICT_KERNEL_RWX select ARCH_SUPPORTS_ATOMIC_RMW + select ARCH_SUPPORTS_DEBUG_PAGEALLOC if PPC32 || PPC_BOOK3S_64 select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF if PPC64 select ARCH_USE_QUEUED_RWLOCKS if PPC_QUEUED_SPINLOCKS @@ -355,10 +356,6 @@ config PPC_OF_PLATFORM_PCI depends on PCI depends on PPC64 # not supported on 32 bits yet -config ARCH_SUPPORTS_DEBUG_PAGEALLOC - depends on PPC32 || PPC_BOOK3S_64 - def_bool y - config ARCH_SUPPORTS_UPROBES def_bool y diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index 44377fd7860e..9283c6f9ae2a 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -14,6 +14,7 @@ config RISCV def_bool y select ARCH_CLOCKSOURCE_INIT select ARCH_SUPPORTS_ATOMIC_RMW + select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU select ARCH_HAS_BINFMT_FLAT select ARCH_HAS_DEBUG_VM_PGTABLE select ARCH_HAS_DEBUG_VIRTUAL if MMU @@ -153,9 +154,6 @@ config ARCH_SELECT_MEMORY_MODEL config ARCH_WANT_GENERAL_HUGETLB def_bool y -config ARCH_SUPPORTS_DEBUG_PAGEALLOC - def_bool y - config SYS_SUPPORTS_HUGETLBFS depends on MMU def_bool y diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 183f1f4b2ae6..41a72861987c 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -461,8 +461,6 @@ static inline int ptep_clear_flush_young(struct vm_area_struct *vma, #define VMALLOC_START 0 #define VMALLOC_END TASK_SIZE -static inline void __kernel_map_pages(struct page *page, int numpages, int enable) {} - #endif /* !CONFIG_MMU */ #define kern_addr_valid(addr) (1) /* FIXME */ diff --git a/arch/riscv/mm/pageattr.c b/arch/riscv/mm/pageattr.c index 19fecb362d81..321b09d2e2ea 100644 --- a/arch/riscv/mm/pageattr.c +++ b/arch/riscv/mm/pageattr.c @@ -184,6 +184,7 @@ int set_direct_map_default_noflush(struct page *page) return ret; } +#ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { if (!debug_pagealloc_enabled()) @@ -196,3 +197,4 @@ void __kernel_map_pages(struct page *page, int numpages, int enable) __set_memory((unsigned long)page_address(page), numpages, __pgprot(0), __pgprot(_PAGE_PRESENT)); } +#endif diff --git a/arch/s390/Kconfig b/arch/s390/Kconfig index 4a2a12be04c9..991a850a6c0b 100644 --- a/arch/s390/Kconfig +++ b/arch/s390/Kconfig @@ -35,9 +35,6 @@ config GENERIC_LOCKBREAK config PGSTE def_bool y if KVM -config ARCH_SUPPORTS_DEBUG_PAGEALLOC - def_bool y - config AUDIT_ARCH def_bool y @@ -106,6 +103,7 @@ config S390 select ARCH_INLINE_WRITE_UNLOCK_IRQRESTORE select ARCH_STACKWALK select ARCH_SUPPORTS_ATOMIC_RMW + select ARCH_SUPPORTS_DEBUG_PAGEALLOC select ARCH_SUPPORTS_NUMA_BALANCING select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_CMPXCHG_LOCKREF diff --git a/arch/sparc/Kconfig b/arch/sparc/Kconfig index a6ca135442f9..2c729b8d097a 100644 --- a/arch/sparc/Kconfig +++ b/arch/sparc/Kconfig @@ -88,6 +88,7 @@ config SPARC64 select HAVE_C_RECORDMCOUNT select HAVE_ARCH_AUDITSYSCALL select ARCH_SUPPORTS_ATOMIC_RMW + select ARCH_SUPPORTS_DEBUG_PAGEALLOC select HAVE_NMI select HAVE_REGS_AND_STACK_ACCESS_API select ARCH_USE_QUEUED_RWLOCKS @@ -148,9 +149,6 @@ config GENERIC_ISA_DMA bool default y if SPARC32 -config ARCH_SUPPORTS_DEBUG_PAGEALLOC - def_bool y if SPARC64 - config PGTABLE_LEVELS default 4 if 64BIT default 3 diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index f6946b81f74a..0db3fb1da70c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -91,6 +91,7 @@ config X86 select ARCH_STACKWALK select ARCH_SUPPORTS_ACPI select ARCH_SUPPORTS_ATOMIC_RMW + select ARCH_SUPPORTS_DEBUG_PAGEALLOC select ARCH_SUPPORTS_NUMA_BALANCING if X86_64 select ARCH_USE_BUILTIN_BSWAP select ARCH_USE_QUEUED_RWLOCKS @@ -329,9 +330,6 @@ config ZONE_DMA32 config AUDIT_ARCH def_bool y if X86_64 -config ARCH_SUPPORTS_DEBUG_PAGEALLOC - def_bool y - config KASAN_SHADOW_OFFSET hex depends on KASAN diff --git a/arch/x86/mm/pat/set_memory.c b/arch/x86/mm/pat/set_memory.c index 40baa90e74f4..7f248fc45317 100644 --- a/arch/x86/mm/pat/set_memory.c +++ b/arch/x86/mm/pat/set_memory.c @@ -2194,6 +2194,7 @@ int set_direct_map_default_noflush(struct page *page) return __set_pages_p(page, 1); } +#ifdef CONFIG_DEBUG_PAGEALLOC void __kernel_map_pages(struct page *page, int numpages, int enable) { if (PageHighMem(page)) @@ -2225,6 +2226,7 @@ void __kernel_map_pages(struct page *page, int numpages, int enable) arch_flush_lazy_mmu_mode(); } +#endif /* CONFIG_DEBUG_PAGEALLOC */ #ifdef CONFIG_HIBERNATION bool kernel_page_present(struct page *page) diff --git a/include/linux/mm.h b/include/linux/mm.h index 14e397f3752c..ab0ef6bd351d 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -2924,7 +2924,11 @@ static inline bool debug_pagealloc_enabled_static(void) return static_branch_unlikely(&_debug_pagealloc_enabled); } -#if defined(CONFIG_DEBUG_PAGEALLOC) || defined(CONFIG_ARCH_HAS_SET_DIRECT_MAP) +#ifdef CONFIG_DEBUG_PAGEALLOC +/* + * To support DEBUG_PAGEALLOC architecture must ensure that + * __kernel_map_pages() never fails + */ extern void __kernel_map_pages(struct page *page, int numpages, int enable); static inline void debug_pagealloc_map_pages(struct page *page, @@ -2937,13 +2941,13 @@ static inline void debug_pagealloc_map_pages(struct page *page, #ifdef CONFIG_HIBERNATION extern bool kernel_page_present(struct page *page); #endif /* CONFIG_HIBERNATION */ -#else /* CONFIG_DEBUG_PAGEALLOC || CONFIG_ARCH_HAS_SET_DIRECT_MAP */ +#else /* CONFIG_DEBUG_PAGEALLOC */ static inline void debug_pagealloc_map_pages(struct page *page, int numpages, int enable) {} #ifdef CONFIG_HIBERNATION static inline bool kernel_page_present(struct page *page) { return true; } #endif /* CONFIG_HIBERNATION */ -#endif /* CONFIG_DEBUG_PAGEALLOC || CONFIG_ARCH_HAS_SET_DIRECT_MAP */ +#endif /* CONFIG_DEBUG_PAGEALLOC */ #ifdef __HAVE_ARCH_GATE_AREA extern struct vm_area_struct *get_gate_vma(struct mm_struct *mm); -- 2.28.0