diff --git a/drivers/tty/sysrq.c b/drivers/tty/sysrq.c
index 2884cd638d64b6466583cf7a6b14de011b540442..bbfd004449b5b81cb6ec1bad174415f5b12410a8 100644
--- a/drivers/tty/sysrq.c
+++ b/drivers/tty/sysrq.c
@@ -578,7 +578,6 @@ void __handle_sysrq(int key, bool check_mask)
rcu_sysrq_start();
rcu_read_lock();
- printk_prefer_direct_enter();
/*
* Raise the apparent loglevel to maximum so that the sysrq header
* is shown to provide the user with positive feedback. We do not
@@ -620,7 +619,6 @@ void __handle_sysrq(int key, bool check_mask)
pr_cont("\n");
console_loglevel = orig_log_level;
}
- printk_prefer_direct_exit();
rcu_read_unlock();
rcu_sysrq_end();
diff --git a/include/linux/printk.h b/include/linux/printk.h
index cd26aab0ab2a094d7fbb276cfa95f8486e9363b5..091fba7283e142af2c740e6b8cf36f080491dd9d 100644
--- a/include/linux/printk.h
+++ b/include/linux/printk.h
@@ -170,9 +170,6 @@ extern void __printk_safe_exit(void);
#define printk_deferred_enter __printk_safe_enter
#define printk_deferred_exit __printk_safe_exit
-extern void printk_prefer_direct_enter(void);
-extern void printk_prefer_direct_exit(void);
-
extern bool pr_flush(int timeout_ms, bool reset_on_progress);
/*
@@ -225,14 +222,6 @@ static inline void printk_deferred_exit(void)
{
}
-static inline void printk_prefer_direct_enter(void)
-{
-}
-
-static inline void printk_prefer_direct_exit(void)
-{
-}
-
static inline bool pr_flush(int timeout_ms, bool reset_on_progress)
{
return true;
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 02a65d55434092581ae852d19abdc58fb57f9fb3..52501e5f765547e0fa83824c5777ad7d45cce077 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -127,8 +127,6 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
* complain:
*/
if (sysctl_hung_task_warnings) {
- printk_prefer_direct_enter();
-
if (sysctl_hung_task_warnings > 0)
sysctl_hung_task_warnings--;
pr_err("INFO: task %s:%d blocked for more than %ld seconds.\n",
@@ -144,8 +142,6 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
if (sysctl_hung_task_all_cpu_backtrace)
hung_task_show_all_bt = true;
-
- printk_prefer_direct_exit();
}
touch_nmi_watchdog();
@@ -208,17 +204,12 @@ static void check_hung_uninterruptible_tasks(unsigned long timeout)
}
unlock:
rcu_read_unlock();
- if (hung_task_show_lock) {
- printk_prefer_direct_enter();
+ if (hung_task_show_lock)
debug_show_all_locks();
- printk_prefer_direct_exit();
- }
if (hung_task_show_all_bt) {
hung_task_show_all_bt = false;
- printk_prefer_direct_enter();
trigger_all_cpu_backtrace();
- printk_prefer_direct_exit();
}
if (hung_task_call_panic)
diff --git a/kernel/panic.c b/kernel/panic.c
index 6737b23322753a2c89954a98ef4e6038fc09b3a1..8355b19676f845667b2fb2924e8d99eec5384c40 100644
--- a/kernel/panic.c
+++ b/kernel/panic.c
@@ -579,8 +579,6 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
{
disable_trace_on_warning();
- printk_prefer_direct_enter();
-
if (file)
pr_warn("WARNING: CPU: %d PID: %d at %s:%d %pS\n",
raw_smp_processor_id(), current->pid, file, line,
@@ -610,8 +608,6 @@ void __warn(const char *file, int line, void *caller, unsigned taint,
/* Just a warning, don't kill lockdep. */
add_taint(taint, LOCKDEP_STILL_OK);
-
- printk_prefer_direct_exit();
}
#ifndef __WARN_FLAGS
diff --git a/kernel/printk/printk.c b/kernel/printk/printk.c
index 5a6273e56b4e9458b1581a3e3248e302fda9d81b..b49c6ff6dca01ba9f5acf0834654da65634b61e3 100644
--- a/kernel/printk/printk.c
+++ b/kernel/printk/printk.c
@@ -362,34 +362,6 @@ static int console_msg_format = MSG_FORMAT_DEFAULT;
static DEFINE_MUTEX(syslog_lock);
#ifdef CONFIG_PRINTK
-static atomic_t printk_prefer_direct = ATOMIC_INIT(0);
-
-/**
- * printk_prefer_direct_enter - cause printk() calls to attempt direct
- * printing to all enabled consoles
- *
- * Since it is not possible to call into the console printing code from any
- * context, there is no guarantee that direct printing will occur.
- *
- * This globally effects all printk() callers.
- *
- * Context: Any context.
- */
-void printk_prefer_direct_enter(void)
-{
- atomic_inc(&printk_prefer_direct);
-}
-
-/**
- * printk_prefer_direct_exit - restore printk() behavior
- *
- * Context: Any context.
- */
-void printk_prefer_direct_exit(void)
-{
- WARN_ON(atomic_dec_if_positive(&printk_prefer_direct) < 0);
-}
-
DECLARE_WAIT_QUEUE_HEAD(log_wait);
/* All 3 protected by @syslog_lock. */
/* the next printk record to read by syslog(READ) or /proc/kmsg */
diff --git a/kernel/rcu/tree_stall.h b/kernel/rcu/tree_stall.h
index 4995c078cff98d69af3add847adf1616bff717f7..a001e1e7a99269c9968059a00cff25ea496dbc99 100644
--- a/kernel/rcu/tree_stall.h
+++ b/kernel/rcu/tree_stall.h
@@ -647,7 +647,6 @@ static void print_cpu_stall(unsigned long gps)
* See Documentation/RCU/stallwarn.rst for info on how to debug
* RCU CPU stall warnings.
*/
- printk_prefer_direct_enter();
trace_rcu_stall_warning(rcu_state.name, TPS("SelfDetected"));
pr_err("INFO: %s self-detected stall on CPU\n", rcu_state.name);
raw_spin_lock_irqsave_rcu_node(rdp->mynode, flags);
@@ -685,7 +684,6 @@ static void print_cpu_stall(unsigned long gps)
*/
set_tsk_need_resched(current);
set_preempt_need_resched();
- printk_prefer_direct_exit();
}
static void check_cpu_stall(struct rcu_data *rdp)
diff --git a/kernel/reboot.c b/kernel/reboot.c
index 4177645e74d6af001695d4443fc5d288e67a7ca3..6bcc5d6a6572b7decf4b731d9f130374555bf7d5 100644
--- a/kernel/reboot.c
+++ b/kernel/reboot.c
@@ -447,11 +447,9 @@ static int __orderly_reboot(void)
ret = run_cmd(reboot_cmd);
if (ret) {
- printk_prefer_direct_enter();
pr_warn("Failed to start orderly reboot: forcing the issue\n");
emergency_sync();
kernel_restart(NULL);
- printk_prefer_direct_exit();
}
return ret;
@@ -464,7 +462,6 @@ static int __orderly_poweroff(bool force)
ret = run_cmd(poweroff_cmd);
if (ret && force) {
- printk_prefer_direct_enter();
pr_warn("Failed to start orderly shutdown: forcing the issue\n");
/*
@@ -474,7 +471,6 @@ static int __orderly_poweroff(bool force)
*/
emergency_sync();
kernel_power_off();
- printk_prefer_direct_exit();
}
return ret;
@@ -532,8 +528,6 @@ EXPORT_SYMBOL_GPL(orderly_reboot);
*/
static void hw_failure_emergency_poweroff_func(struct work_struct *work)
{
- printk_prefer_direct_enter();
-
/*
* We have reached here after the emergency shutdown waiting period has
* expired. This means orderly_poweroff has not been able to shut off
@@ -550,8 +544,6 @@ static void hw_failure_emergency_poweroff_func(struct work_struct *work)
*/
pr_emerg("Hardware protection shutdown failed. Trying emergency restart\n");
emergency_restart();
-
- printk_prefer_direct_exit();
}
static DECLARE_DELAYED_WORK(hw_failure_emergency_poweroff_work,
@@ -590,13 +582,11 @@ void hw_protection_shutdown(const char *reason, int ms_until_forced)
{
static atomic_t allow_proceed = ATOMIC_INIT(1);
- printk_prefer_direct_enter();
-
pr_emerg("HARDWARE PROTECTION shutdown (%s)\n", reason);
/* Shutdown should be initiated only once. */
if (!atomic_dec_and_test(&allow_proceed))
- goto out;
+ return;
/*
* Queue a backup emergency shutdown in the event of
@@ -604,8 +594,6 @@ void hw_protection_shutdown(const char *reason, int ms_until_forced)
*/
hw_failure_emergency_poweroff(ms_until_forced);
orderly_poweroff(true);
-out:
- printk_prefer_direct_exit();
}
EXPORT_SYMBOL_GPL(hw_protection_shutdown);
diff --git a/kernel/watchdog.c b/kernel/watchdog.c
index 40024e03d42203833f7bfebfd9c754c26e77a255..9166220457bcbbf12852a591d617b442da3b2c37 100644
--- a/kernel/watchdog.c
+++ b/kernel/watchdog.c
@@ -424,8 +424,6 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
/* Start period for the next softlockup warning. */
update_report_ts();
- printk_prefer_direct_enter();
-
pr_emerg("BUG: soft lockup - CPU#%d stuck for %us! [%s:%d]\n",
smp_processor_id(), duration,
current->comm, task_pid_nr(current));
@@ -444,8 +442,6 @@ static enum hrtimer_restart watchdog_timer_fn(struct hrtimer *hrtimer)
add_taint(TAINT_SOFTLOCKUP, LOCKDEP_STILL_OK);
if (softlockup_panic)
panic("softlockup: hung tasks");
-
- printk_prefer_direct_exit();
}
return HRTIMER_RESTART;
diff --git a/kernel/watchdog_hld.c b/kernel/watchdog_hld.c
index 701f35f0e2d4499325202c6c7b7b592e590fc330..247bf0b1582ca1cf352f006aa1fd5f689f8f5859 100644
--- a/kernel/watchdog_hld.c
+++ b/kernel/watchdog_hld.c
@@ -135,8 +135,6 @@ static void watchdog_overflow_callback(struct perf_event *event,
if (__this_cpu_read(hard_watchdog_warn) == true)
return;
- printk_prefer_direct_enter();
-
pr_emerg("Watchdog detected hard LOCKUP on cpu %d\n",
this_cpu);
print_modules();
@@ -157,8 +155,6 @@ static void watchdog_overflow_callback(struct perf_event *event,
if (hardlockup_panic)
nmi_panic(regs, "Hard LOCKUP");
- printk_prefer_direct_exit();
-
__this_cpu_write(hard_watchdog_warn, true);
return;
}