[10/15] mm: move init_mem_debugging_and_hardening() to mm/mm_init.c

Message ID	20230319220008.2138576-11-rppt@kernel.org (mailing list archive)
State	Superseded
Headers	show Return-Path: <linux-mips-owner@vger.kernel.org> From: Mike Rapoport <rppt@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: David Hildenbrand <david@redhat.com>, Matthew Wilcox <willy@infradead.org>, Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@kernel.org>, Mike Rapoport <rppt@kernel.org>, Thomas Bogendoerfer <tsbogend@alpha.franken.de>, Vlastimil Babka <vbabka@suse.cz>, linux-kernel@vger.kernel.org, linux-mips@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 10/15] mm: move init_mem_debugging_and_hardening() to mm/mm_init.c Date: Mon, 20 Mar 2023 00:00:03 +0200 Message-Id: <20230319220008.2138576-11-rppt@kernel.org> In-Reply-To: <20230319220008.2138576-1-rppt@kernel.org> References: <20230319220008.2138576-1-rppt@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk
Series	mm: move core MM initialization to mm/mm_init.c \| expand [00/15] mm: move core MM initialization to mm/mm_init.c [01/15] mips: fix comment about pgtable_init() [02/15] mm/cma: move init_cma_reserved_pages() to cma.c and make it static [03/15] mm/page_alloc: add helper for checking if check_pages_enabled [05/15] mm: handle hashdist initialization in mm/mm_init.c [06/15] mm/page_alloc: rename page_alloc_init() to page_alloc_init_cpuhp() [07/15] init: fold build_all_zonelists() and page_alloc_init_cpuhp() to mm_init() [08/15] init,mm: move mm_init() to mm/mm_init.c and rename it to mm_core_init() [09/15] mm: move pgtable_init() to mm/mm_init.c and make it static [10/15] mm: move init_mem_debugging_and_hardening() to mm/mm_init.c [11/15] init,mm: fold late call to page_ext_init() to page_alloc_init_late() [12/15] mm: move mem_init_print_info() to mm_init.c [13/15] mm: move kmem_cache_init() declaration to mm/slab.h [14/15] mm: move vmalloc_init() declaration to mm/internal.h [15/15] MAINTAINERS: extend memblock entry to include MM initialization

diff --git a/include/linux/mm.h b/include/linux/mm.h index c3c67d8bc833..2fecabb1a328 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3394,7 +3394,6 @@ extern int apply_to_existing_page_range(struct mm_struct *mm, unsigned long address, unsigned long size, pte_fn_t fn, void *data); -extern void __init init_mem_debugging_and_hardening(void); #ifdef CONFIG_PAGE_POISONING extern void __kernel_poison_pages(struct page *page, int numpages); extern void __kernel_unpoison_pages(struct page *page, int numpages); diff --git a/mm/internal.h b/mm/internal.h index 6b154b4a538f..827499e39d78 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -204,6 +204,14 @@ pmd_t *mm_find_pmd(struct mm_struct *mm, unsigned long address); extern char * const zone_names[MAX_NR_ZONES]; +/* perform sanity checks on struct pages being allocated or freed */ +DECLARE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); + +static inline bool is_check_pages_enabled(void) +{ + return static_branch_unlikely(&check_pages_enabled); +} + /* * Structure for holding the mostly immutable allocation parameters passed * between functions involved in allocations, including the alloc_pages* diff --git a/mm/mm_init.c b/mm/mm_init.c index a91fbb57c4cc..ae6bd26cf5a2 100644 --- a/mm/mm_init.c +++ b/mm/mm_init.c @@ -2517,6 +2517,95 @@ static void __init pgtable_init(void) pgtable_cache_init(); } +static bool _init_on_alloc_enabled_early __read_mostly + = IS_ENABLED(CONFIG_INIT_ON_ALLOC_DEFAULT_ON); +static int __init early_init_on_alloc(char *buf) +{ + + return kstrtobool(buf, &_init_on_alloc_enabled_early); +} +early_param("init_on_alloc", early_init_on_alloc); + +static bool _init_on_free_enabled_early __read_mostly + = IS_ENABLED(CONFIG_INIT_ON_FREE_DEFAULT_ON); +static int __init early_init_on_free(char *buf) +{ + return kstrtobool(buf, &_init_on_free_enabled_early); +} +early_param("init_on_free", early_init_on_free); + +DEFINE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); + +/* + * Enable static keys related to various memory debugging and hardening options. + * Some override others, and depend on early params that are evaluated in the + * order of appearance. So we need to first gather the full picture of what was + * enabled, and then make decisions. + */ +static void __init init_mem_debugging_and_hardening(void) +{ + bool page_poisoning_requested = false; + bool want_check_pages = false; + +#ifdef CONFIG_PAGE_POISONING + /* + * Page poisoning is debug page alloc for some arches. If + * either of those options are enabled, enable poisoning. + */ + if (page_poisoning_enabled() || + (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && + debug_pagealloc_enabled())) { + static_branch_enable(&_page_poisoning_enabled); + page_poisoning_requested = true; + want_check_pages = true; + } +#endif + + if ((_init_on_alloc_enabled_early || _init_on_free_enabled_early) && + page_poisoning_requested) { + pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, " + "will take precedence over init_on_alloc and init_on_free\n"); + _init_on_alloc_enabled_early = false; + _init_on_free_enabled_early = false; + } + + if (_init_on_alloc_enabled_early) { + want_check_pages = true; + static_branch_enable(&init_on_alloc); + } else { + static_branch_disable(&init_on_alloc); + } + + if (_init_on_free_enabled_early) { + want_check_pages = true; + static_branch_enable(&init_on_free); + } else { + static_branch_disable(&init_on_free); + } + + if (IS_ENABLED(CONFIG_KMSAN) && + (_init_on_alloc_enabled_early || _init_on_free_enabled_early)) + pr_info("mem auto-init: please make sure init_on_alloc and init_on_free are disabled when running KMSAN\n"); + +#ifdef CONFIG_DEBUG_PAGEALLOC + if (debug_pagealloc_enabled()) { + want_check_pages = true; + static_branch_enable(&_debug_pagealloc_enabled); + + if (debug_guardpage_minorder()) + static_branch_enable(&_debug_guardpage_enabled); + } +#endif + + /* + * Any page debugging or hardening option also enables sanity checking + * of struct pages being allocated or freed. With CONFIG_DEBUG_VM it's + * enabled already. + */ + if (!IS_ENABLED(CONFIG_DEBUG_VM) && want_check_pages) + static_branch_enable(&check_pages_enabled); +} + /* Report memory auto-initialization states for this boot. */ static void __init report_meminit(void) { diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d1276bfe7a30..2f333c26170c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -240,31 +240,6 @@ EXPORT_SYMBOL(init_on_alloc); DEFINE_STATIC_KEY_MAYBE(CONFIG_INIT_ON_FREE_DEFAULT_ON, init_on_free); EXPORT_SYMBOL(init_on_free); -/* perform sanity checks on struct pages being allocated or freed */ -static DEFINE_STATIC_KEY_MAYBE(CONFIG_DEBUG_VM, check_pages_enabled); - -static inline bool is_check_pages_enabled(void) -{ - return static_branch_unlikely(&check_pages_enabled); -} - -static bool _init_on_alloc_enabled_early __read_mostly - = IS_ENABLED(CONFIG_INIT_ON_ALLOC_DEFAULT_ON); -static int __init early_init_on_alloc(char *buf) -{ - - return kstrtobool(buf, &_init_on_alloc_enabled_early); -} -early_param("init_on_alloc", early_init_on_alloc); - -static bool _init_on_free_enabled_early __read_mostly - = IS_ENABLED(CONFIG_INIT_ON_FREE_DEFAULT_ON); -static int __init early_init_on_free(char *buf) -{ - return kstrtobool(buf, &_init_on_free_enabled_early); -} -early_param("init_on_free", early_init_on_free); - /* * A cached value of the page's pageblock's migratetype, used when the page is * put on a pcplist. Used to avoid the pageblock migratetype lookup when @@ -798,76 +773,6 @@ static inline void clear_page_guard(struct zone *zone, struct page *page, unsigned int order, int migratetype) {} #endif -/* - * Enable static keys related to various memory debugging and hardening options. - * Some override others, and depend on early params that are evaluated in the - * order of appearance. So we need to first gather the full picture of what was - * enabled, and then make decisions. - */ -void __init init_mem_debugging_and_hardening(void) -{ - bool page_poisoning_requested = false; - bool want_check_pages = false; - -#ifdef CONFIG_PAGE_POISONING - /* - * Page poisoning is debug page alloc for some arches. If - * either of those options are enabled, enable poisoning. - */ - if (page_poisoning_enabled() || - (!IS_ENABLED(CONFIG_ARCH_SUPPORTS_DEBUG_PAGEALLOC) && - debug_pagealloc_enabled())) { - static_branch_enable(&_page_poisoning_enabled); - page_poisoning_requested = true; - want_check_pages = true; - } -#endif - - if ((_init_on_alloc_enabled_early || _init_on_free_enabled_early) && - page_poisoning_requested) { - pr_info("mem auto-init: CONFIG_PAGE_POISONING is on, " - "will take precedence over init_on_alloc and init_on_free\n"); - _init_on_alloc_enabled_early = false; - _init_on_free_enabled_early = false; - } - - if (_init_on_alloc_enabled_early) { - want_check_pages = true; - static_branch_enable(&init_on_alloc); - } else { - static_branch_disable(&init_on_alloc); - } - - if (_init_on_free_enabled_early) { - want_check_pages = true; - static_branch_enable(&init_on_free); - } else { - static_branch_disable(&init_on_free); - } - - if (IS_ENABLED(CONFIG_KMSAN) && - (_init_on_alloc_enabled_early || _init_on_free_enabled_early)) - pr_info("mem auto-init: please make sure init_on_alloc and init_on_free are disabled when running KMSAN\n"); - -#ifdef CONFIG_DEBUG_PAGEALLOC - if (debug_pagealloc_enabled()) { - want_check_pages = true; - static_branch_enable(&_debug_pagealloc_enabled); - - if (debug_guardpage_minorder()) - static_branch_enable(&_debug_guardpage_enabled); - } -#endif - - /* - * Any page debugging or hardening option also enables sanity checking - * of struct pages being allocated or freed. With CONFIG_DEBUG_VM it's - * enabled already. - */ - if (!IS_ENABLED(CONFIG_DEBUG_VM) && want_check_pages) - static_branch_enable(&check_pages_enabled); -} - static inline void set_buddy_order(struct page *page, unsigned int order) { set_page_private(page, order);

[10/15] mm: move init_mem_debugging_and_hardening() to mm/mm_init.c

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