// 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_mostlystatic int __init early_debug_pagealloc(char *buf)return kstrtobool(buf, &_debug_pagealloc_enabled_early);"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_PAGE_ORDER / 2) {"Bad debug_guardpage_minorder value: %s\n" , buf);return 0;"Setting debug_guardpage_minorder to %lu\n" , res);return 0;"debug_guardpage_minorder" , debug_guardpage_minorder_setup);bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order)if (order >= debug_guardpage_minorder())return false ;return true ;void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order)quality 91%
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