From c349cdcaba589fb49cf105093ebc695eb8b9ff08 Mon Sep 17 00:00:00 2001 From: Josh Poimboeuf Date: Mon, 13 Feb 2017 19:42:37 -0600 Subject: livepatch: move patching functions into patch.c Move functions related to the actual patching of functions and objects into a new patch.c file. Signed-off-by: Josh Poimboeuf Acked-by: Miroslav Benes Reviewed-by: Petr Mladek Reviewed-by: Kamalesh Babulal Signed-off-by: Jiri Kosina --- kernel/livepatch/patch.h | 32 ++++++++++++++++++++++++++++++++ 1 file changed, 32 insertions(+) create mode 100644 kernel/livepatch/patch.h (limited to 'kernel/livepatch/patch.h') 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 +#include +#include + +/** + * 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 */ -- cgit