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Diffstat (limited to 'include/linux/livepatch.h')
-rw-r--r--include/linux/livepatch.h19
1 files changed, 10 insertions, 9 deletions
diff --git a/include/linux/livepatch.h b/include/linux/livepatch.h
index 31db7a05dd36..b60e8abab0ab 100644
--- a/include/linux/livepatch.h
+++ b/include/linux/livepatch.h
@@ -37,8 +37,9 @@ enum klp_state {
* struct klp_func - function structure for live patching
* @old_name: name of the function to be patched
* @new_func: pointer to the patched function code
- * @old_addr: a hint conveying at what address the old function
- * can be found (optional, vmlinux patches only)
+ * @old_sympos: a hint indicating which symbol position the old function
+ * can be found (optional)
+ * @old_addr: the address of the function being patched
* @kobj: kobject for sysfs resources
* @state: tracks function-level patch application state
* @stack_node: list node for klp_ops func_stack list
@@ -48,16 +49,16 @@ struct klp_func {
const char *old_name;
void *new_func;
/*
- * The old_addr field is optional and can be used to resolve
- * duplicate symbol names in the vmlinux object. If this
- * information is not present, the symbol is located by name
- * with kallsyms. If the name is not unique and old_addr is
- * not provided, the patch application fails as there is no
- * way to resolve the ambiguity.
+ * The old_sympos field is optional and can be used to resolve
+ * duplicate symbol names in livepatch objects. If this field is zero,
+ * it is expected the symbol is unique, otherwise patching fails. If
+ * this value is greater than zero then that occurrence of the symbol
+ * in kallsyms for the given object is used.
*/
- unsigned long old_addr;
+ unsigned long old_sympos;
/* internal */
+ unsigned long old_addr;
struct kobject kobj;
enum klp_state state;
struct list_head stack_node;