1 files changed, 26 insertions, 14 deletions

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index e30afdca791..e373c4a9de5 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -33,6 +33,9 @@
 #include <linux/list.h>
 #include <linux/notifier.h>
 #include <linux/smp.h>
+#include <linux/percpu.h>
+#include <linux/spinlock.h>
+#include <linux/rcupdate.h>
 
 #include <asm/kprobes.h>
 
@@ -106,6 +109,9 @@ struct jprobe {
 	kprobe_opcode_t *entry;	/* probe handling code to jump to */
 };
 
+DECLARE_PER_CPU(struct kprobe *, current_kprobe);
+DECLARE_PER_CPU(struct kprobe_ctlblk, kprobe_ctlblk);
+
 #ifdef ARCH_SUPPORTS_KRETPROBES
 extern void arch_prepare_kretprobe(struct kretprobe *rp, struct pt_regs *regs);
 #else /* ARCH_SUPPORTS_KRETPROBES */
@@ -142,17 +148,7 @@ struct kretprobe_instance {
 };
 
 #ifdef CONFIG_KPROBES
-/* Locks kprobe: irq must be disabled */
-void lock_kprobes(void);
-void unlock_kprobes(void);
-
-/* kprobe running now on this CPU? */
-static inline int kprobe_running(void)
-{
-	extern unsigned int kprobe_cpu;
-	return kprobe_cpu == smp_processor_id();
-}
-
+extern spinlock_t kretprobe_lock;
 extern int arch_prepare_kprobe(struct kprobe *p);
 extern void arch_copy_kprobe(struct kprobe *p);
 extern void arch_arm_kprobe(struct kprobe *p);
@@ -163,10 +159,26 @@ extern void show_registers(struct pt_regs *regs);
 extern kprobe_opcode_t *get_insn_slot(void);
 extern void free_insn_slot(kprobe_opcode_t *slot);
 
-/* Get the kprobe at this addr (if any).  Must have called lock_kprobes */
+/* Get the kprobe at this addr (if any) - called with preemption disabled */
 struct kprobe *get_kprobe(void *addr);
 struct hlist_head * kretprobe_inst_table_head(struct task_struct *tsk);
 
+/* kprobe_running() will just return the current_kprobe on this CPU */
+static inline struct kprobe *kprobe_running(void)
+{
+	return (__get_cpu_var(current_kprobe));
+}
+
+static inline void reset_current_kprobe(void)
+{
+	__get_cpu_var(current_kprobe) = NULL;
+}
+
+static inline struct kprobe_ctlblk *get_kprobe_ctlblk(void)
+{
+	return (&__get_cpu_var(kprobe_ctlblk));
+}
+
 int register_kprobe(struct kprobe *p);
 void unregister_kprobe(struct kprobe *p);
 int setjmp_pre_handler(struct kprobe *, struct pt_regs *);
@@ -183,9 +195,9 @@ void add_rp_inst(struct kretprobe_instance *ri);
 void kprobe_flush_task(struct task_struct *tk);
 void recycle_rp_inst(struct kretprobe_instance *ri);
 #else /* CONFIG_KPROBES */
-static inline int kprobe_running(void)
+static inline struct kprobe *kprobe_running(void)
 {
-	return 0;
+	return NULL;
 }
 static inline int register_kprobe(struct kprobe *p)
 {