1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fault-inject.h>
3 #include <linux/error-injection.h>
7 struct fault_attr attr
;
9 bool ignore_gfp_highmem
;
10 bool ignore_gfp_reclaim
;
13 .attr
= FAULT_ATTR_INITIALIZER
,
14 .ignore_gfp_reclaim
= true,
15 .ignore_gfp_highmem
= true,
19 static int __init
setup_fail_page_alloc(char *str
)
21 return setup_fault_attr(&fail_page_alloc
.attr
, str
);
23 __setup("fail_page_alloc=", setup_fail_page_alloc
);
25 bool should_fail_alloc_page(gfp_t gfp_mask
, unsigned int order
)
29 if (order
< fail_page_alloc
.min_order
)
31 if (gfp_mask
& __GFP_NOFAIL
)
33 if (fail_page_alloc
.ignore_gfp_highmem
&& (gfp_mask
& __GFP_HIGHMEM
))
35 if (fail_page_alloc
.ignore_gfp_reclaim
&&
36 (gfp_mask
& __GFP_DIRECT_RECLAIM
))
39 /* See comment in __should_failslab() */
40 if (gfp_mask
& __GFP_NOWARN
)
41 flags
|= FAULT_NOWARN
;
43 return should_fail_ex(&fail_page_alloc
.attr
, 1 << order
, flags
);
45 ALLOW_ERROR_INJECTION(should_fail_alloc_page
, TRUE
);
47 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
49 static int __init
fail_page_alloc_debugfs(void)
51 umode_t mode
= S_IFREG
| 0600;
54 dir
= fault_create_debugfs_attr("fail_page_alloc", NULL
,
55 &fail_page_alloc
.attr
);
57 debugfs_create_bool("ignore-gfp-wait", mode
, dir
,
58 &fail_page_alloc
.ignore_gfp_reclaim
);
59 debugfs_create_bool("ignore-gfp-highmem", mode
, dir
,
60 &fail_page_alloc
.ignore_gfp_highmem
);
61 debugfs_create_u32("min-order", mode
, dir
, &fail_page_alloc
.min_order
);
66 late_initcall(fail_page_alloc_debugfs
);
68 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */