sched: Fix negative count for jump label

hulk inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I7DA63
CVE: NA

--------------------------------

Add mutex lock to prevent negative count for jump label.

[28612.530675] ------------[ cut here ]------------
[28612.532708] jump label: negative count!
[28612.535031] WARNING: CPU: 4 PID: 3899 at kernel/jump_label.c:202
	__static_key_slow_dec_cpuslocked+0x204/0x240
[28612.538216] Kernel panic - not syncing: panic_on_warn set ...
[28612.538216]
[28612.540487] CPU: 4 PID: 3899 Comm: sh Kdump: loaded Not tainted
[28612.542788] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
[28612.546455] Call Trace:
[28612.547339]  dump_stack+0xc6/0x11e
[28612.548546]  ? __static_key_slow_dec_cpuslocked+0x200/0x240
[28612.550352]  panic+0x1d6/0x46b
[28612.551375]  ? refcount_error_report+0x2a5/0x2a5
[28612.552915]  ? kmsg_dump_rewind_nolock+0xde/0xde
[28612.554358]  ? sched_clock_cpu+0x18/0x1b0
[28612.555699]  ? __warn+0x1d1/0x210
[28612.556799]  ? __static_key_slow_dec_cpuslocked+0x204/0x240
[28612.558548]  __warn+0x1ec/0x210
[28612.559621]  ? __static_key_slow_dec_cpuslocked+0x204/0x240
[28612.561536]  report_bug+0x1ee/0x2b0
[28612.562706]  fixup_bug.part.4+0x37/0x80
[28612.563937]  do_error_trap+0x21c/0x260
[28612.565109]  ? fixup_bug.part.4+0x80/0x80
[28612.566453]  ? check_preemption_disabled+0x34/0x1f0
[28612.567991]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[28612.569534]  ? lockdep_hardirqs_off+0x1cb/0x2b0
[28612.570993]  ? error_entry+0x9a/0x130
[28612.572138]  ? trace_hardirqs_off_caller+0x59/0x1a0
[28612.573710]  ? trace_hardirqs_off_thunk+0x1a/0x1c
[28612.575232]  invalid_op+0x14/0x20
[root@lo[ca2lh8ost6 12.576387]  ? vprintk_func+0x68/0x1a0
[28612.577827]  ? __static_key_slow_dec_cpuslocked+0x204/0x240
smartg[ri2d]8# 612.579662]  ? __static_key_slow_dec_cpuslocked+0x204/0x240
[28612.581781]  ? static_key_disable+0x30/0x30
[28612.583248]  ? s
tatic_key_slow_dec+0x57/0x90
[28612.584997]  ? tg_set_dynamic_affinity_mode+0x42/0x70
[28612.586714]  ? cgroup_file_write+0x471/0x6a0
[28612.588162]  ? cgroup_css.part.4+0x100/0x100
[28612.589579]  ? cgroup_css.part.4+0x100/0x100
[28612.591031]  ? kernfs_fop_write+0x2af/0x430
[28612.592625]  ? kernfs_vma_page_mkwrite+0x230/0x230
[28612.594274]  ? __vfs_write+0xef/0x680
[28612.595590]  ? kernel_read+0x110/0x110
ea8612.596899]  ? check_preemption_disabled+0x3mkd4ir/: 0canxno1t fcr0
Signed-off-by: NHui Tang <tanghui20@huawei.com>
Reviewed-by: NZhang Qiao <zhangqiao22@huawei.com>
Signed-off-by: NZhang Changzhong <zhangchangzhong@huawei.com>

kernel/sched/fair.c

@@ -5286,6 +5286,8 @@ static inline void unthrottle_offline_cfs_rqs(struct rq *rq) {}
 #define AUTO_AFFINITY_DEFAULT_PERIOD_MS 2000
 #define IS_DOMAIN_SET(level, mask)	((1 << (level)) & (mask))
 
+static DEFINE_MUTEX(smart_grid_used_mutex);
+
 static inline unsigned long cpu_util(int cpu);
 static unsigned long target_load(int cpu, int type);
 static unsigned long capacity_of(int cpu);
@@ -5454,9 +5456,11 @@ void start_auto_affinity(struct auto_affinity *auto_affi)
 {
 	ktime_t delay_ms;
 
+	mutex_lock(&smart_grid_used_mutex);
 	raw_spin_lock_irq(&auto_affi->lock);
 	if (auto_affi->period_active == 1) {
 		raw_spin_unlock_irq(&auto_affi->lock);
+		mutex_unlock(&smart_grid_used_mutex);
 		return;
 	}
 
@@ -5469,15 +5473,18 @@ void start_auto_affinity(struct auto_affinity *auto_affi)
 	raw_spin_unlock_irq(&auto_affi->lock);
 
 	smart_grid_usage_inc();
+	mutex_unlock(&smart_grid_used_mutex);
 }
 
 void stop_auto_affinity(struct auto_affinity *auto_affi)
 {
 	struct affinity_domain *ad = &auto_affi->ad;
 
+	mutex_lock(&smart_grid_used_mutex);
 	raw_spin_lock_irq(&auto_affi->lock);
 	if (auto_affi->period_active == 0) {
 		raw_spin_unlock_irq(&auto_affi->lock);
+		mutex_unlock(&smart_grid_used_mutex);
 		return;
 	}
 
@@ -5488,6 +5495,7 @@ void stop_auto_affinity(struct auto_affinity *auto_affi)
 	raw_spin_unlock_irq(&auto_affi->lock);
 
 	smart_grid_usage_dec();
+	mutex_unlock(&smart_grid_used_mutex);
 }
 
 static struct sched_group *sd_find_idlest_group(struct sched_domain *sd)
@@ -5693,7 +5701,7 @@ static void destroy_auto_affinity(struct task_group *tg)
 {
 	struct auto_affinity *auto_affi = tg->auto_affinity;
 
-	if (auto_affi->mode)
+	if (auto_affi->period_active)
 		smart_grid_usage_dec();
 
 	hrtimer_cancel(&auto_affi->period_timer);