The patch titled
signals: kill the awful task_rq_unlock_wait() hack
has been added to the -mm tree. Its filename is
signals-kill-the-awful-task_rq_unlock_wait-hack.patch
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------------------------------------------------------
Subject: signals: kill the awful task_rq_unlock_wait() hack
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Now that task->signal can't go away we can revert the horrible hack added
by ad474caca3e2a0550b7ce0706527ad5ab389a4d4 ("fix for
account_group_exec_runtime(), make sure ->signal can't be freed under
rq->lock").
And we can do more cleanups sched_stats.h/posix-cpu-timers.c later.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Alan Cox <alan@xxxxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/sched.h | 1 -
kernel/exit.c | 5 -----
kernel/sched.c | 8 --------
3 files changed, 14 deletions(-)
diff -puN include/linux/sched.h~signals-kill-the-awful-task_rq_unlock_wait-hack include/linux/sched.h
--- a/include/linux/sched.h~signals-kill-the-awful-task_rq_unlock_wait-hack
+++ a/include/linux/sched.h
@@ -269,7 +269,6 @@ extern void init_idle(struct task_struct
extern void init_idle_bootup_task(struct task_struct *idle);
extern int runqueue_is_locked(int cpu);
-extern void task_rq_unlock_wait(struct task_struct *p);
extern cpumask_var_t nohz_cpu_mask;
#if defined(CONFIG_SMP) && defined(CONFIG_NO_HZ)
diff -puN kernel/exit.c~signals-kill-the-awful-task_rq_unlock_wait-hack kernel/exit.c
--- a/kernel/exit.c~signals-kill-the-awful-task_rq_unlock_wait-hack
+++ a/kernel/exit.c
@@ -146,11 +146,6 @@ static void __exit_signal(struct task_st
if (sig) {
flush_sigqueue(&sig->shared_pending);
taskstats_tgid_free(sig);
- /*
- * Make sure ->signal can't go away under rq->lock,
- * see account_group_exec_runtime().
- */
- task_rq_unlock_wait(tsk);
tty_kref_put(tty);
}
}
diff -puN kernel/sched.c~signals-kill-the-awful-task_rq_unlock_wait-hack kernel/sched.c
--- a/kernel/sched.c~signals-kill-the-awful-task_rq_unlock_wait-hack
+++ a/kernel/sched.c
@@ -957,14 +957,6 @@ static struct rq *task_rq_lock(struct ta
}
}
-void task_rq_unlock_wait(struct task_struct *p)
-{
- struct rq *rq = task_rq(p);
-
- smp_mb(); /* spin-unlock-wait is not a full memory barrier */
- raw_spin_unlock_wait(&rq->lock);
-}
-
static void __task_rq_unlock(struct rq *rq)
__releases(rq->lock)
{
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
origin.patch
linux-next.patch
posix-cpu-timers-reset-expire-cache-when-no-timer-is-running.patch
cpu-timers-simplify-rlimit_cpu-handling.patch
cpu-timers-cleanup-arm_timer.patch
cpu-timers-return-correct-previous-timer-reload-value.patch
cpu-timers-change-sigev_none-timer-implementation.patch
cpu-timers-assure-to-not-iterate-over-all-threads-in-fastpath_timer_check.patch
cpu-timers-optimize-run_posix_cpu_timers.patch
proc-cleanup-remove-unused-assignments.patch
kmod-add-init-function-to-usermodehelper.patch
exec-replace-call_usermodehelper_pipe-with-use-of-umh-init-function-and-resolve-limit.patch
umh-creds-convert-call_usermodehelper_keys-to-use-subprocess_info-init.patch
umh-creds-kill-subprocess_info-cred-logic.patch
call_usermodehelper-no-need-to-unblock-signals.patch
wait_for_helper-sigchld-from-user-space-can-lead-to-use-after-free.patch
call_usermodehelper-simplify-fix-umh_no_wait-case.patch
call_usermodehelper-umh_wait_exec-ignores-kernel_thread-failure.patch
coredump-factor-out-the-not-ispipe-file-checks.patch
coredump-cleanup-ispipe-code.patch
coredump-factor-out-put_cred-calls.patch
coredump-shift-down_writemmap_sem-into-coredump_wait.patch
exit-exit_notify-can-trust-signal-notify_count-0.patch
exit-change-zap_other_threads-to-count-sub-threads.patch
exit-avoid-sig-count-in-de_thread-__exit_signal-synchronization.patch
exit-avoid-sig-count-in-__exit_signal-to-detect-the-group-dead-case.patch
posix-cpu-timers-avoid-task-signal-=-null-checks.patch
ia64-ptrace_attach_sync_user_rbs-avoid-task-signal-=-null-checks.patch
fork-exit-move-tty_kref_put-outside-of-__cleanup_signal.patch
signals-make-task_struct-signal-immutable-refcountable.patch
signals-clear-signal-tty-when-the-last-thread-exits.patch
signals-kill-the-awful-task_rq_unlock_wait-hack.patch
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