[patch 3/8] posix-timers: Move posixtimer_exec_cleanup() out of exec.c

[Thomas Gleixner <tglx@kernel.org>]

Move it to the POSIX timer code and provide a proper stub when POSIX timers
are disabled in Kconfig.

No functional change.

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
---
 fs/exec.c                    |   13 +------------
 include/linux/posix-timers.h |    3 +++
 kernel/time/posix-timers.c   |    9 +++++++++
 3 files changed, 13 insertions(+), 12 deletions(-)

--- a/fs/exec.c
+++ b/fs/exec.c
@@ -1115,17 +1115,6 @@ static struct file *bprm_identity_file(c
 	return bprm->file;
 }
 
-static void posixtimer_exec(struct task_struct *me)
-{
-#ifdef CONFIG_POSIX_TIMERS
-	spin_lock_irq(&me->sighand->siglock);
-	posix_cpu_timers_exit(me);
-	spin_unlock_irq(&me->sighand->siglock);
-	exit_itimers(me);
-	flush_itimer_signals();
-#endif
-}
-
 /*
  * Calling this is the point of no return. None of the failures will be
  * seen by userspace since either the process is already taking a fatal
@@ -1171,7 +1160,7 @@ int begin_new_exec(struct linux_binprm *
 	 * POSIX timer will not free an enqueued timer because the TID lookup
 	 * failed as the original target TID was the old leader.
 	 */
-	posixtimer_exec(me);
+	posixtimer_exec();
 
 	/* see the comment in check_unsafe_exec() */
 	current->fs->in_exec = 0;
--- a/include/linux/posix-timers.h
+++ b/include/linux/posix-timers.h
@@ -232,6 +232,8 @@ void set_process_cpu_timer(struct task_s
 int update_rlimit_cpu(struct task_struct *task, unsigned long rlim_new);
 
 #ifdef CONFIG_POSIX_TIMERS
+void posixtimer_exec(void);
+
 static inline void posixtimer_putref(struct k_itimer *tmr)
 {
 	if (rcuref_put(&tmr->rcuref))
@@ -259,6 +261,7 @@ static inline bool posixtimer_valid(cons
 	return !(val & 0x1UL);
 }
 #else  /* CONFIG_POSIX_TIMERS */
+static inline void posixtimer_exec(void) { }
 static inline void posixtimer_sigqueue_getref(struct sigqueue *q) { }
 static inline void posixtimer_sigqueue_putref(struct sigqueue *q) { }
 #endif /* !CONFIG_POSIX_TIMERS */
--- a/kernel/time/posix-timers.c
+++ b/kernel/time/posix-timers.c
@@ -1120,6 +1120,15 @@ void exit_itimers(struct task_struct *ts
 	}
 }
 
+void posixtimer_exec(void)
+{
+	scoped_guard(spinlock_irq, &current->sighand->siglock)
+		posix_cpu_timers_exit(current);
+
+	exit_itimers(current);
+	flush_itimer_signals();
+}
+
 SYSCALL_DEFINE2(clock_settime, const clockid_t, which_clock,
 		const struct __kernel_timespec __user *, tp)
 {