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linuxkpi: improvements for linux_pid_task() and linux_get_pid_task().

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Unify functions bodies.
Do not call tdfind() if pid is passed, and do not call pfind() if tid
is supplied.

Reviewed by:	hselasky
Sponsored by:	Mellanox Technologies
MFC after:	1 week
Differential revision:	https://reviews.freebsd.org/D25534
This commit is contained in:
Konstantin Belousov 2020-07-02 10:42:58 +00:00
parent 4bc5ce2c74
commit f334f212d9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=362886
1 changed files with 34 additions and 47 deletions
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81
sys/compat/linuxkpi/common/src/linux_current.c
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@ -155,65 +155,52 @@ linuxkpi_thread_dtor(void *arg __unused, struct thread *td)
put_task_struct(ts);
}
struct task_struct *
linux_pid_task(pid_t pid)
static struct task_struct *
linux_get_pid_task_int(pid_t pid, const bool do_get)
{
struct thread *td;
struct proc *p;
struct task_struct *ts;
/* try to find corresponding thread */
td = tdfind(pid, -1);
if (td != NULL) {
struct task_struct *ts = td->td_lkpi_task;
PROC_UNLOCK(td->td_proc);
return (ts);
}
/* try to find corresponding procedure */
p = pfind(pid);
if (p != NULL) {
FOREACH_THREAD_IN_PROC(p, td) {
struct task_struct *ts = td->td_lkpi_task;
if (ts != NULL) {
PROC_UNLOCK(p);
return (ts);
}
if (pid > PID_MAX) {
/* try to find corresponding thread */
td = tdfind(pid, -1);
if (td != NULL) {
ts = td->td_lkpi_task;
if (do_get && ts != NULL)
get_task_struct(ts);
PROC_UNLOCK(td->td_proc);
return (ts);
}
} else {
/* try to find corresponding procedure */
p = pfind(pid);
if (p != NULL) {
FOREACH_THREAD_IN_PROC(p, td) {
ts = td->td_lkpi_task;
if (ts != NULL) {
if (do_get)
get_task_struct(ts);
PROC_UNLOCK(p);
return (ts);
}
}
PROC_UNLOCK(p);
}
PROC_UNLOCK(p);
}
return (NULL);
}
struct task_struct *
linux_pid_task(pid_t pid)
{
return (linux_get_pid_task_int(pid, false));
}
struct task_struct *
linux_get_pid_task(pid_t pid)
{
struct thread *td;
struct proc *p;
/* try to find corresponding thread */
td = tdfind(pid, -1);
if (td != NULL) {
struct task_struct *ts = td->td_lkpi_task;
if (ts != NULL)
get_task_struct(ts);
PROC_UNLOCK(td->td_proc);
return (ts);
}
/* try to find corresponding procedure */
p = pfind(pid);
if (p != NULL) {
FOREACH_THREAD_IN_PROC(p, td) {
struct task_struct *ts = td->td_lkpi_task;
if (ts != NULL) {
get_task_struct(ts);
PROC_UNLOCK(p);
return (ts);
}
}
PROC_UNLOCK(p);
}
return (NULL);
return (linux_get_pid_task_int(pid, true));
}
bool