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git.ipfire.org Git - thirdparty/kernel/linux.git/blob - mm/failslab.c
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/fault-inject.h>
3 #include <linux/slab.h>
8 struct fault_attr attr
;
9 bool ignore_gfp_reclaim
;
12 .attr
= FAULT_ATTR_INITIALIZER
,
13 .ignore_gfp_reclaim
= true,
14 .cache_filter
= false,
17 bool __should_failslab(struct kmem_cache
*s
, gfp_t gfpflags
)
21 /* No fault-injection for bootstrap cache */
22 if (unlikely(s
== kmem_cache
))
25 if (gfpflags
& __GFP_NOFAIL
)
28 if (failslab
.ignore_gfp_reclaim
&&
29 (gfpflags
& __GFP_DIRECT_RECLAIM
))
32 if (failslab
.cache_filter
&& !(s
->flags
& SLAB_FAILSLAB
))
36 * In some cases, it expects to specify __GFP_NOWARN
37 * to avoid printing any information(not just a warning),
38 * thus avoiding deadlocks. See commit 6b9dbedbe349 for
41 if (gfpflags
& __GFP_NOWARN
)
42 flags
|= FAULT_NOWARN
;
44 return should_fail_ex(&failslab
.attr
, s
->object_size
, flags
);
47 static int __init
setup_failslab(char *str
)
49 return setup_fault_attr(&failslab
.attr
, str
);
51 __setup("failslab=", setup_failslab
);
53 #ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
54 static int __init
failslab_debugfs_init(void)
57 umode_t mode
= S_IFREG
| 0600;
59 dir
= fault_create_debugfs_attr("failslab", NULL
, &failslab
.attr
);
63 debugfs_create_bool("ignore-gfp-wait", mode
, dir
,
64 &failslab
.ignore_gfp_reclaim
);
65 debugfs_create_bool("cache-filter", mode
, dir
,
66 &failslab
.cache_filter
);
71 late_initcall(failslab_debugfs_init
);
73 #endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */