diff options
Diffstat (limited to 'mm/page_alloc.c')
| -rw-r--r-- | mm/page_alloc.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 060303496094..3180d79be20c 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -644,16 +644,27 @@ void prep_compound_page(struct page *page, unsigned int order) #ifdef CONFIG_DEBUG_PAGEALLOC unsigned int _debug_guardpage_minorder; -bool _debug_pagealloc_enabled __read_mostly - = IS_ENABLED(CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT); + +#ifdef CONFIG_DEBUG_PAGEALLOC_ENABLE_DEFAULT +DEFINE_STATIC_KEY_TRUE(_debug_pagealloc_enabled); +#else +DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled); +#endif EXPORT_SYMBOL(_debug_pagealloc_enabled); -bool _debug_guardpage_enabled __read_mostly; + +DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled); static int __init early_debug_pagealloc(char *buf) { - if (!buf) + bool enable = false; + + if (kstrtobool(buf, &enable)) return -EINVAL; - return kstrtobool(buf, &_debug_pagealloc_enabled); + + if (enable) + static_branch_enable(&_debug_pagealloc_enabled); + + return 0; } early_param("debug_pagealloc", early_debug_pagealloc); @@ -677,7 +688,7 @@ static void init_debug_guardpage(void) if (!debug_guardpage_minorder()) return; - _debug_guardpage_enabled = true; + static_branch_enable(&_debug_guardpage_enabled); } struct page_ext_operations debug_guardpage_ops = { |