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Merge tag 'xtensa-20150830' of git://github.com/czankel/xtensa-linux
[mirror_ubuntu-artful-kernel.git] / mm / failslab.c
1 #include <linux/fault-inject.h>
2 #include <linux/slab.h>
3
4 static struct {
5 struct fault_attr attr;
6 u32 ignore_gfp_wait;
7 int cache_filter;
8 } failslab = {
9 .attr = FAULT_ATTR_INITIALIZER,
10 .ignore_gfp_wait = 1,
11 .cache_filter = 0,
12 };
13
14 bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags)
15 {
16 if (gfpflags & __GFP_NOFAIL)
17 return false;
18
19 if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
20 return false;
21
22 if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB))
23 return false;
24
25 return should_fail(&failslab.attr, size);
26 }
27
28 static int __init setup_failslab(char *str)
29 {
30 return setup_fault_attr(&failslab.attr, str);
31 }
32 __setup("failslab=", setup_failslab);
33
34 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
35 static int __init failslab_debugfs_init(void)
36 {
37 struct dentry *dir;
38 umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
39
40 dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
41 if (IS_ERR(dir))
42 return PTR_ERR(dir);
43
44 if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
45 &failslab.ignore_gfp_wait))
46 goto fail;
47 if (!debugfs_create_bool("cache-filter", mode, dir,
48 &failslab.cache_filter))
49 goto fail;
50
51 return 0;
52 fail:
53 debugfs_remove_recursive(dir);
54
55 return -ENOMEM;
56 }
57
58 late_initcall(failslab_debugfs_init);
59
60 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */