linux/mm/debug_page_alloc.c

// 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(…);
EXPORT_SYMBOL(…);
DEFINE_STATIC_KEY_FALSE(_debug_pagealloc_enabled);
EXPORT_SYMBOL(…);

DEFINE_STATIC_KEY_FALSE(_debug_guardpage_enabled);

static int __init early_debug_pagealloc(char *buf)
{ … }
early_param(…);

static int __init debug_guardpage_minorder_setup(char *buf)
{ … }
early_param(…);

bool __set_page_guard(struct zone *zone, struct page *page, unsigned int order)
{ … }

void __clear_page_guard(struct zone *zone, struct page *page, unsigned int order)
{ … }