diff options
| -rw-r--r-- | include/linux/mm.h | 76 | ||||
| -rw-r--r-- | mm/Makefile | 1 | ||||
| -rw-r--r-- | mm/debug_page_alloc.c | 59 | ||||
| -rw-r--r-- | mm/page_alloc.c | 69 |
4 files changed, 109 insertions, 96 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index f64bfbd53c65..2382eaf6fd81 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -3471,9 +3471,58 @@ static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) if (debug_pagealloc_enabled_static()) __kernel_map_pages(page, numpages, 0); } + +extern unsigned int _debug_guardpage_minorder; +DECLARE_STATIC_KEY_FALSE(_debug_guardpage_enabled); + +static inline unsigned int debug_guardpage_minorder(void) +{ + return _debug_guardpage_minorder; +} + +static inline bool debug_guardpage_enabled(void) +{ + return static_branch_unlikely(&_debug_guardpage_enabled); +} + +static inline bool page_is_guard(struct page *page) +{ + if (!debug_guardpage_enabled()) + return false; + + return PageGuard(page); +} + +bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order, + int migratetype); +static inline bool set_page_guard(struct zone *zone, struct page *page, + unsigned int order, int migratetype) +{ + if (!debug_guardpage_enabled()) + return false; + return __set_page_guard(zone, page, order, migratetype); +} + +void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order, + int migratetype); +static inline void clear_page_guard(struct zone *zone, struct page *page, + unsigned int order, int migratetype) +{ + if (!debug_guardpage_enabled()) + return; + __clear_page_guard(zone, page, order, migratetype); +} + #else /* CONFIG_DEBUG_PAGEALLOC */ static inline void debug_pagealloc_map_pages(struct page *page, int numpages) {} static inline void debug_pagealloc_unmap_pages(struct page *page, int numpages) {} +static inline unsigned int debug_guardpage_minorder(void) { return 0; } +static inline bool debug_guardpage_enabled(void) { return false; } +static inline bool page_is_guard(struct page *page) { return false; } +static inline bool set_page_guard(struct zone *zone, struct page *page, + unsigned int order, int migratetype) { return false; } +static inline void clear_page_guard(struct zone *zone, struct page *page, + unsigned int order, int migratetype) {} #endif /* CONFIG_DEBUG_PAGEALLOC */ #ifdef __HAVE_ARCH_GATE_AREA @@ -3711,33 +3760,6 @@ static inline bool vma_is_special_huge(const struct vm_area_struct *vma) #endif /* CONFIG_TRANSPARENT_HUGEPAGE || CONFIG_HUGETLBFS */ -#ifdef CONFIG_DEBUG_PAGEALLOC -extern unsigned int _debug_guardpage_minorder; -DECLARE_STATIC_KEY_FALSE(_debug_guardpage_enabled); - -static inline unsigned int debug_guardpage_minorder(void) -{ - return _debug_guardpage_minorder; -} - -static inline bool debug_guardpage_enabled(void) -{ - return static_branch_unlikely(&_debug_guardpage_enabled); -} - -static inline bool page_is_guard(struct page *page) -{ - if (!debug_guardpage_enabled()) - return false; - - return PageGuard(page); -} -#else -static inline unsigned int debug_guardpage_minorder(void) { return 0; } -static inline bool debug_guardpage_enabled(void) { return false; } -static inline bool page_is_guard(struct page *page) { return false; } -#endif /* CONFIG_DEBUG_PAGEALLOC */ - #if MAX_NUMNODES > 1 void __init setup_nr_node_ids(void); #else diff --git a/mm/Makefile b/mm/Makefile index 0eec4bc72d3f..678530a07326 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -124,6 +124,7 @@ obj-$(CONFIG_SECRETMEM) += secretmem.o obj-$(CONFIG_CMA_SYSFS) += cma_sysfs.o obj-$(CONFIG_USERFAULTFD) += userfaultfd.o obj-$(CONFIG_IDLE_PAGE_TRACKING) += page_idle.o +obj-$(CONFIG_DEBUG_PAGEALLOC) += debug_page_alloc.o obj-$(CONFIG_DEBUG_PAGE_REF) += debug_page_ref.o obj-$(CONFIG_DAMON) += damon/ obj-$(CONFIG_HARDENED_USERCOPY) += usercopy.o diff --git a/mm/debug_page_alloc.c b/mm/debug_page_alloc.c new file mode 100644 index 000000000000..f9d145730fd1 --- /dev/null +++ b/mm/debug_page_alloc.c @@ -0,0 +1,59 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/mm.h> +#include <linux/page-isolation.h> + +unsigned int _debug_guardpage_minorder; + +bool _debug_pagealloc_enabled_early __read_mostly + = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); +EXPORT_SYMBOL(_debug_pagealloc_enabled_early); +DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); +EXPORT_SYMBOL(_debug_pagealloc_enabled); + +DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled); + +static int __init early_debug_pagealloc(char *buf) +{ + return kstrtobool(buf, &_debug_pagealloc_enabled_early); +} +early_param("debug_pagealloc", early_debug_pagealloc); + +static int __init debug_guardpage_minorder_setup(char *buf) +{ + unsigned long res; + + if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { + pr_err("Bad debug_guardpage_minorder value\n"); + return 0; + } + _debug_guardpage_minorder = res; + pr_info("Setting debug_guardpage_minorder to %lu\n", res); + return 0; +} +early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup); + +bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order, + int migratetype) +{ + if (order >= debug_guardpage_minorder()) + return false; + + __SetPageGuard(page); + INIT_LIST_HEAD(&page->buddy_list); + set_page_private(page, order); + /* Guard pages are not available for any usage */ + if (!is_migrate_isolate(migratetype)) + __mod_zone_freepage_state(zone, -(1 << order), migratetype); + + return true; +} + +void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order, + int migratetype) +{ + __ClearPageGuard(page); + + set_page_private(page, 0); + if (!is_migrate_isolate(migratetype)) + __mod_zone_freepage_state(zone, (1 << order), migratetype); +} diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 2b8e4a086c3d..40fa763c5074 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -664,75 +664,6 @@ void destroy_large_folio(struct folio *folio) compound_page_dtors[dtor](&folio->page); } -#ifdef CONFIG_DEBUG_PAGEALLOC -unsigned int _debug_guardpage_minorder; - -bool _debug_pagealloc_enabled_early __read_mostly - = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); -EXPORT_SYMBOL(_debug_pagealloc_enabled_early); -DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); -EXPORT_SYMBOL(_debug_pagealloc_enabled); - -DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled); - -static int __init early_debug_pagealloc(char *buf) -{ - return kstrtobool(buf, &_debug_pagealloc_enabled_early); -} -early_param("debug_pagealloc", early_debug_pagealloc); - -static int __init debug_guardpage_minorder_setup(char *buf) -{ - unsigned long res; - - if (kstrtoul(buf, 10, &res) < 0 || res > MAX_ORDER / 2) { - pr_err("Bad debug_guardpage_minorder value\n"); - return 0; - } - _debug_guardpage_minorder = res; - pr_info("Setting debug_guardpage_minorder to %lu\n", res); - return 0; -} -early_param("debug_guardpage_minorder", debug_guardpage_minorder_setup); - -static inline bool set_page_guard(struct zone *zone, struct page *page, - unsigned int order, int migratetype) -{ - if (!debug_guardpage_enabled()) - return false; - - if (order >= debug_guardpage_minorder()) - return false; - - __SetPageGuard(page); - INIT_LIST_HEAD(&page->buddy_list); - set_page_private(page, order); - /* Guard pages are not available for any usage */ - if (!is_migrate_isolate(migratetype)) - __mod_zone_freepage_state(zone, -(1 << order), migratetype); - - return true; -} - -static inline void clear_page_guard(struct zone *zone, struct page *page, - unsigned int order, int migratetype) -{ - if (!debug_guardpage_enabled()) - return; - - __ClearPageGuard(page); - - set_page_private(page, 0); - if (!is_migrate_isolate(migratetype)) - __mod_zone_freepage_state(zone, (1 << order), migratetype); -} -#else -static inline bool set_page_guard(struct zone *zone, struct page *page, - unsigned int order, int migratetype) { return false; } -static inline void clear_page_guard(struct zone *zone, struct page *page, - unsigned int order, int migratetype) {} -#endif - static inline void set_buddy_order(struct page *page, unsigned int order) { set_page_private(page, order); |