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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728293031323334353637383940414243444546474849505152// 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_PAGE_ORDER / 2) { pr_err("Bad debug_guardpage_minorder value: %s\n", buf); 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){ if (order >= debug_guardpage_minorder()) return false;
__SetPageGuard(page); INIT_LIST_HEAD(&page->buddy_list); set_page_private(page, order);
return true;}
void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order){ __ClearPageGuard(page); set_page_private(page, 0);}