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tracing/function-return-tracer: free the return stack on free_task() 

Impact: avoid losing some traces when a task is freed

do_exit() is not the last function called when a task finishes.
There are still some functions which are to be called such as
ree_task().  So we delay the freeing of the return stack to the
last moment.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Frederic Weisbecker 2008-11-23 18:43:39 +01:00 committed by Ingo Molnar
parent eae849ca03
commit 65afa5e603
2 changed files with 1 additions and 2 deletions
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2
kernel/exit.c
View File

@ -47,7 +47,6 @@
#include <linux/task_io_accounting_ops.h>
#include <linux/tracehook.h>
#include <trace/sched.h>
#include <linux/ftrace.h>
#include <asm/uaccess.h>
#include <asm/unistd.h>
@ -1128,7 +1127,6 @@ NORET_TYPE void do_exit(long code)
preempt_disable();
/* causes final put_task_struct in finish_task_switch(). */
tsk->state = TASK_DEAD;
ftrace_retfunc_exit_task(tsk);
schedule();
BUG();
/* Avoid "noreturn function does return". */

1
kernel/fork.c
View File

@ -140,6 +140,7 @@ void free_task(struct task_struct *tsk)
prop_local_destroy_single(&tsk->dirties);
free_thread_info(tsk->stack);
rt_mutex_debug_task_free(tsk);
ftrace_retfunc_exit_task(tsk);
free_task_struct(tsk);
}
EXPORT_SYMBOL(free_task);