// SPDX-License-Identifier: GPL-2.0#include <linux/fault-inject.h>#include <linux/error-injection.h>#include <linux/debugfs.h>#include <linux/slab.h>#include <linux/mm.h>#include "slab.h" static struct {	struct fault_attr attr;	bool ignore_gfp_reclaim;	bool cache_filter;} failslab = {	.attr = FAULT_ATTR_INITIALIZER,	.ignore_gfp_reclaim = true,	.cache_filter = false,}; int should_failslab(struct kmem_cache *s, gfp_t gfpflags){	int flags = 0; 	/* No fault-injection for bootstrap cache */	if (unlikely(s == kmem_cache))		return 0; 	if (gfpflags & __GFP_NOFAIL)		return 0; 	if (failslab.ignore_gfp_reclaim &&			(gfpflags & __GFP_DIRECT_RECLAIM))		return 0; 	if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))		return 0; 	/*	 * In some cases, it expects to specify __GFP_NOWARN	 * to avoid printing any information(not just a warning),	 * thus avoiding deadlocks. See commit 6b9dbedbe349 for	 * details.	 */	if (gfpflags & __GFP_NOWARN)		flags |= FAULT_NOWARN; 	return should_fail_ex(&failslab.attr, s->object_size, flags) ? -ENOMEM : 0;}ALLOW_ERROR_INJECTION(should_failslab, ERRNO); static int __init setup_failslab(char *str){	return setup_fault_attr(&failslab.attr, str);}__setup("failslab=", setup_failslab); #ifdef CONFIG_FAULT_INJECTION_DEBUG_FSstatic int __init failslab_debugfs_init(void){	struct dentry *dir;	umode_t mode = S_IFREG | 0600; 	dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);	if (IS_ERR(dir))		return PTR_ERR(dir); 	debugfs_create_bool("ignore-gfp-wait", mode, dir,			    &failslab.ignore_gfp_reclaim);	debugfs_create_bool("cache-filter", mode, dir,			    &failslab.cache_filter); 	return 0;} late_initcall(failslab_debugfs_init); #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */