Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / mm / failslab.c

diff --git a/kernel/mm/failslab.c b/kernel/mm/failslab.c
new file mode 100644 (file)
index 0000000..fefaaba
--- /dev/null
+++ b/kernel/mm/failslab.c
@@ -0,0 +1,60 @@
+#include <linux/fault-inject.h>
+#include <linux/slab.h>
+
+static struct {
+       struct fault_attr attr;
+       u32 ignore_gfp_wait;
+       int cache_filter;
+} failslab = {
+       .attr = FAULT_ATTR_INITIALIZER,
+       .ignore_gfp_wait = 1,
+       .cache_filter = 0,
+};
+
+bool should_failslab(size_t size, gfp_t gfpflags, unsigned long cache_flags)
+{
+       if (gfpflags & __GFP_NOFAIL)
+               return false;
+
+        if (failslab.ignore_gfp_wait && (gfpflags & __GFP_WAIT))
+               return false;
+
+       if (failslab.cache_filter && !(cache_flags & SLAB_FAILSLAB))
+               return false;
+
+       return should_fail(&failslab.attr, size);
+}
+
+static int __init setup_failslab(char *str)
+{
+       return setup_fault_attr(&failslab.attr, str);
+}
+__setup("failslab=", setup_failslab);
+
+#ifdef CONFIG_FAULT_INJECTION_DEBUG_FS
+static int __init failslab_debugfs_init(void)
+{
+       struct dentry *dir;
+       umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
+
+       dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
+       if (IS_ERR(dir))
+               return PTR_ERR(dir);
+
+       if (!debugfs_create_bool("ignore-gfp-wait", mode, dir,
+                               &failslab.ignore_gfp_wait))
+               goto fail;
+       if (!debugfs_create_bool("cache-filter", mode, dir,
+                               &failslab.cache_filter))
+               goto fail;
+
+       return 0;
+fail:
+       debugfs_remove_recursive(dir);
+
+       return -ENOMEM;
+}
+
+late_initcall(failslab_debugfs_init);
+
+#endif /* CONFIG_FAULT_INJECTION_DEBUG_FS */