Merge tag 'usb-5.19-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb
[platform/kernel/linux-starfive.git] / mm / failslab.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fault-inject.h>
3 #include <linux/slab.h>
4 #include <linux/mm.h>
5 #include "slab.h"
6
7 static struct {
8         struct fault_attr attr;
9         bool ignore_gfp_reclaim;
10         bool cache_filter;
11 } failslab = {
12         .attr = FAULT_ATTR_INITIALIZER,
13         .ignore_gfp_reclaim = true,
14         .cache_filter = false,
15 };
16
17 bool __should_failslab(struct kmem_cache *s, gfp_t gfpflags)
18 {
19         /* No fault-injection for bootstrap cache */
20         if (unlikely(s == kmem_cache))
21                 return false;
22
23         if (gfpflags & __GFP_NOFAIL)
24                 return false;
25
26         if (failslab.ignore_gfp_reclaim &&
27                         (gfpflags & __GFP_DIRECT_RECLAIM))
28                 return false;
29
30         if (failslab.cache_filter && !(s->flags & SLAB_FAILSLAB))
31                 return false;
32
33         if (gfpflags & __GFP_NOWARN)
34                 failslab.attr.no_warn = true;
35
36         return should_fail(&failslab.attr, s->object_size);
37 }
38
39 static int __init setup_failslab(char *str)
40 {
41         return setup_fault_attr(&failslab.attr, str);
42 }
43 __setup("failslab=", setup_failslab);
44
45 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
46 static int __init failslab_debugfs_init(void)
47 {
48         struct dentry *dir;
49         umode_t mode = S_IFREG | 0600;
50
51         dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
52         if (IS_ERR(dir))
53                 return PTR_ERR(dir);
54
55         debugfs_create_bool("ignore-gfp-wait", mode, dir,
56                             &failslab.ignore_gfp_reclaim);
57         debugfs_create_bool("cache-filter", mode, dir,
58                             &failslab.cache_filter);
59
60         return 0;
61 }
62
63 late_initcall(failslab_debugfs_init);
64
65 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */