Merge commit 'origin/master' into for-linus/xen/master

* commit 'origin/master': (4825 commits)
  Fix build errors due to CONFIG_BRANCH_TRACER=y
  parport: Use the PCI IRQ if offered
  tty: jsm cleanups
  Adjust path to gpio headers
  KGDB_SERIAL_CONSOLE check for module
  Change KCONFIG name
  tty: Blackin CTS/RTS
  Change hardware flow control from poll to interrupt driven
  Add support for the MAX3100 SPI UART.
  lanana: assign a device name and numbering for MAX3100
  serqt: initial clean up pass for tty side
  tty: Use the generic RS485 ioctl on CRIS
  tty: Correct inline types for tty_driver_kref_get()
  splice: fix deadlock in splicing to file
  nilfs2: support nanosecond timestamp
  nilfs2: introduce secondary super block
  nilfs2: simplify handling of active state of segments
  nilfs2: mark minor flag for checkpoint created by internal operation
  nilfs2: clean up sketch file
  nilfs2: super block operations fix endian bug
  ...

Conflicts:
	arch/x86/include/asm/thread_info.h
	arch/x86/lguest/boot.c
	drivers/xen/manage.c

1 files changed, 47 insertions, 5 deletions

diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h
index 2ec6cc14a114..bcd9c07848be 100644
--- a/include/linux/kprobes.h
+++ b/include/linux/kprobes.h
@@ -94,12 +94,16 @@ struct kprobe {
 	/* Called after addr is executed, unless... */
 	kprobe_post_handler_t post_handler;
 
-	/* ... called if executing addr causes a fault (eg. page fault).
-	 * Return 1 if it handled fault, otherwise kernel will see it. */
+	/*
+	 * ... called if executing addr causes a fault (eg. page fault).
+	 * Return 1 if it handled fault, otherwise kernel will see it.
+	 */
 	kprobe_fault_handler_t fault_handler;
 
-	/* ... called if breakpoint trap occurs in probe handler.
-	 * Return 1 if it handled break, otherwise kernel will see it. */
+	/*
+	 * ... called if breakpoint trap occurs in probe handler.
+	 * Return 1 if it handled break, otherwise kernel will see it.
+	 */
 	kprobe_break_handler_t break_handler;
 
 	/* Saved opcode (which has been replaced with breakpoint) */
@@ -108,18 +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
@@ -279,6 +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)
@@ -345,5 +362,30 @@ 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 */
+static inline int disable_kretprobe(struct kretprobe *rp)
+{
+	return disable_kprobe(&rp->kp);
+}
+static inline int enable_kretprobe(struct kretprobe *rp)
+{
+	return enable_kprobe(&rp->kp);
+}
+static inline int disable_jprobe(struct jprobe *jp)
+{
+	return disable_kprobe(&jp->kp);
+}
+static inline int enable_jprobe(struct jprobe *jp)
+{
+	return enable_kprobe(&jp->kp);
+}
+
 #endif /* _LINUX_KPROBES_H */