[PATCH] kretprobe instance recycled by parent process

When kretprobe probes the schedule() function, if the probed process exits
then schedule() will never return, so some kretprobe instances will never
be recycled.

In this patch the parent process will recycle retprobe instances of the
probed function and there will be no memory leak of kretprobe instances.

Signed-off-by: bibo mao <bibo.mao@intel.com>
Cc: Masami Hiramatsu <hiramatu@sdl.hitachi.co.jp>
Cc: Prasanna S Panchamukhi <prasanna@in.ibm.com>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 0 insertions, 8 deletions

diff --git a/arch/i386/kernel/process.c b/arch/i386/kernel/process.c
index 299e61674084..24b3e745478b 100644
--- a/arch/i386/kernel/process.c
+++ b/arch/i386/kernel/process.c
@@ -38,7 +38,6 @@
 #include <linux/kallsyms.h>
 #include <linux/ptrace.h>
 #include <linux/random.h>
-#include <linux/kprobes.h>
 
 #include <asm/uaccess.h>
 #include <asm/pgtable.h>
@@ -364,13 +363,6 @@ void exit_thread(void)
         struct task_struct *tsk = current;
         struct thread_struct *t = &tsk->thread;
 
-        /*
-         * Remove function-return probe instances associated with this task
-         * and put them back on the free list. Do not insert an exit probe for
-         * this function, it will be disabled by kprobe_flush_task if you do.
-         */
-        kprobe_flush_task(tsk);
-
         /* The process may have allocated an io port bitmap... nuke it. */
         if (unlikely(NULL != t->io_bitmap_ptr)) {
                 int cpu = get_cpu();