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torture: Add a kthread-creation callback to _torture_create_kthread() 

[ Upstream commit 67d5404d27 ]

This commit adds a kthread-creation callback to the
_torture_create_kthread() function, which allows callers of a new
torture_create_kthread_cb() macro to specify a function to be invoked
after the kthread is created but before it is awakened for the first time.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: Josh Triplett <josh@joshtriplett.org>
Cc: Juri Lelli <juri.lelli@redhat.com>
Cc: Valentin Schneider <vschneid@redhat.com>
Cc: Dietmar Eggemann <dietmar.eggemann@arm.com>
Cc: kernel-team@android.com
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Acked-by: John Stultz <jstultz@google.com>
Stable-dep-of: cca42bd8eb ("rcutorture: Fix stuttering races and other issues")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul E. McKenney 2023-07-19 15:50:07 -07:00 committed by Greg Kroah-Hartman
parent ecc8943672
commit 525bcb9c29
2 changed files with 10 additions and 3 deletions
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7
include/linux/torture.h
View File

@ -108,12 +108,15 @@ bool torture_must_stop(void);
bool torture_must_stop_irq(void);
void torture_kthread_stopping(char *title);
int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
char *f, struct task_struct **tp);
char *f, struct task_struct **tp, void (*cbf)(struct task_struct *tp));
void _torture_stop_kthread(char *m, struct task_struct **tp);
#define torture_create_kthread(n, arg, tp) \
_torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
"Failed to create " #n, &(tp))
"Failed to create " #n, &(tp), NULL)
#define torture_create_kthread_cb(n, arg, tp, cbf) \
_torture_create_kthread(n, (arg), #n, "Creating " #n " task", \
"Failed to create " #n, &(tp), cbf)
#define torture_stop_kthread(n, tp) \
_torture_stop_kthread("Stopping " #n " task", &(tp))

6
kernel/torture.c
View File

@ -926,7 +926,7 @@ EXPORT_SYMBOL_GPL(torture_kthread_stopping);
* it starts, you will need to open-code your own.
*/
int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
char *f, struct task_struct **tp)
char *f, struct task_struct **tp, void (*cbf)(struct task_struct *tp))
{
int ret = 0;
@ -938,6 +938,10 @@ int _torture_create_kthread(int (*fn)(void *arg), void *arg, char *s, char *m,
*tp = NULL;
return ret;
}
if (cbf)
cbf(*tp);
wake_up_process(*tp); // Process is sleeping, so ordering provided.
torture_shuffle_task_register(*tp);
return ret;