kprobes: support per-kprobe disabling

[linux-2.6-omap-h63xx.git] / include / linux / kprobes.h

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 39826a6783646295330a2707e01d277583798313..1071cfddddc9877fcaa93fbbcaf5ad89dd7d243f 100644 (file)
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -112,18 +112,28 @@ struct kprobe {
        /* copy of the original instruction */
        struct arch_specific_insn ainsn;
 
-       /* Indicates various status flags.  Protected by kprobe_mutex. */
+       /*
+        * Indicates various status flags.
+        * Protected by kprobe_mutex after this kprobe is registered.
+        */
        u32 flags;
 };
 
 /* Kprobe status flags */
 #define KPROBE_FLAG_GONE       1 /* breakpoint has already gone */
+#define KPROBE_FLAG_DISABLED   2 /* probe is temporarily disabled */
 
+/* Has this kprobe gone ? */
 static inline int kprobe_gone(struct kprobe *p)
 {
        return p->flags & KPROBE_FLAG_GONE;
 }
 
+/* Is this kprobe disabled ? */
+static inline int kprobe_disabled(struct kprobe *p)
+{
+       return p->flags & (KPROBE_FLAG_DISABLED | KPROBE_FLAG_GONE);
+}
 /*
  * Special probe type that uses setjmp-longjmp type tricks to resume
  * execution at a specified entry with a matching prototype corresponding
@@ -283,6 +293,9 @@ void unregister_kretprobes(struct kretprobe **rps, int num);
 void kprobe_flush_task(struct task_struct *tk);
 void recycle_rp_inst(struct kretprobe_instance *ri, struct hlist_head *head);
 
+int disable_kprobe(struct kprobe *kp);
+int enable_kprobe(struct kprobe *kp);
+
 #else /* !CONFIG_KPROBES: */
 
 static inline int kprobes_built_in(void)
@@ -349,5 +362,13 @@ static inline void unregister_kretprobes(struct kretprobe **rps, int num)
 static inline void kprobe_flush_task(struct task_struct *tk)
 {
 }
+static inline int disable_kprobe(struct kprobe *kp)
+{
+       return -ENOSYS;
+}
+static inline int enable_kprobe(struct kprobe *kp)
+{
+       return -ENOSYS;
+}
 #endif /* CONFIG_KPROBES */
 #endif /* _LINUX_KPROBES_H */