diff options
Diffstat (limited to 'kernel/livepatch/patch.h')
| -rw-r--r-- | kernel/livepatch/patch.h | 32 |
1 files changed, 32 insertions, 0 deletions
diff --git a/kernel/livepatch/patch.h b/kernel/livepatch/patch.h new file mode 100644 index 000000000000..2d0cce02dade --- /dev/null +++ b/kernel/livepatch/patch.h @@ -0,0 +1,32 @@ +#ifndef _LIVEPATCH_PATCH_H +#define _LIVEPATCH_PATCH_H + +#include <linux/livepatch.h> +#include <linux/list.h> +#include <linux/ftrace.h> + +/** + * struct klp_ops - structure for tracking registered ftrace ops structs + * + * A single ftrace_ops is shared between all enabled replacement functions + * (klp_func structs) which have the same old_addr. This allows the switch + * between function versions to happen instantaneously by updating the klp_ops + * struct's func_stack list. The winner is the klp_func at the top of the + * func_stack (front of the list). + * + * @node: node for the global klp_ops list + * @func_stack: list head for the stack of klp_func's (active func is on top) + * @fops: registered ftrace ops struct + */ +struct klp_ops { + struct list_head node; + struct list_head func_stack; + struct ftrace_ops fops; +}; + +struct klp_ops *klp_find_ops(unsigned long old_addr); + +int klp_patch_object(struct klp_object *obj); +void klp_unpatch_object(struct klp_object *obj); + +#endif /* _LIVEPATCH_PATCH_H */ |