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livepatch: move patching functions into patch.c

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Move functions related to the actual patching of functions and objects
into a new patch.c file.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Miroslav Benes <mbenes@suse.cz>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Reviewed-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>
This commit is contained in:
Josh Poimboeuf 2017-02-13 19:42:37 -06:00 • committed by Jiri Kosina
parent aa82dc3e00
commit c349cdcaba
4 changed files with 247 additions and 202 deletions
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32
kernel/livepatch/patch.h Normal file
View file

@ -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 */