[PATCH 2/5] Use copy_wait_opts_to_user() in wait_task_stopped()

Vitaly Mayatskikh
2009-05-11T13:27:35Z

All copy-paste getrusage() and put_user() code in wait_task_* functions
is replaced by call to copy_wait_opts_to_user()

Also, there's no reason to have two almost similar branches of copy out
in wait_task_stopped(). The later branch also puts stat_addr to user,
but it can't affect WNOWAIT flag, and it's ok to merge both branches.

Signed-off-by: Vitaly Mayatskikh <v.mayatskih@gmail.com>
---
kernel/exit.c | 20 +-------------------
1 files changed, 1 insertions(+), 19 deletions(-)

diff --git a/kernel/exit.c b/kernel/exit.c
index 9546362..0bf2d3c 100644
--- a/kernel/exit.c
+++ b/kernel/exit.c
@@ -1345,7 +1345,6 @@ static int *task_stopped_code(struct task_struct *p, bool ptrace)
static int wait_task_stopped(struct wait_opts *wo,
int ptrace, struct task_struct *p)
{
- struct siginfo __user *infop;
int retval, exit_code, *p_code, why;
uid_t uid = 0; /* unneeded, required by compiler */
pid_t pid;
@@ -1389,27 +1388,10 @@ unlock_sig:
why = ptrace ? CLD_TRAPPED : CLD_STOPPED;
read_unlock(&tasklist_lock);

- if (unlikely(wo->wo_flags & WNOWAIT))
- return wait_noreap_copyout(wo, p, pid, uid, why, exit_code);
+ retval = copy_wait_opts_to_user(wo, p, pid, uid, why, exit_code, SIGCHLD);

- retval = wo->wo_rusage
- ? getrusage(p, RUSAGE_BOTH, wo->wo_rusage) : 0;
if (!retval && wo->wo_stat)
retval = put_user((exit_code << 8) | 0x7f, wo->wo_stat);
-
- infop = wo->wo_info;
- if (!retval && infop)
- retval = put_user(SIGCHLD, &infop->si_signo);
- if (!retval && infop)
- retval = put_user(0, &infop->si_errno);
- if (!retval && infop)
- retval = put_user((short)why, &infop->si_code);
- if (!retval && infop)
- retval = put_user(exit_code, &infop->si_status);
- if (!retval && infop)
- retval = put_user(pid, &infop->si_pid);
- if (!retval && infop)
- retval = put_user(uid, &infop->si_uid);
if (!retval)
retval = pid;
put_task_struct(p);
--
1.6.2.2