diff --git a/arch/arm64/kernel/rootguard/oplus_guard_general.c b/arch/arm64/kernel/rootguard/oplus_guard_general.c
index 22e4999f356c..191b3af7467c 100644
--- a/arch/arm64/kernel/rootguard/oplus_guard_general.c
+++ b/arch/arm64/kernel/rootguard/oplus_guard_general.c
@@ -83,7 +83,7 @@ static int __init boot_state_init(void)
 	return 0;
 }
 
-static void __exit boot_state_exit()
+static void __exit boot_state_exit(void)
 {
 	return ;
 }
diff --git a/drivers/gpu/drm/msm/oplus/oppo_dc_diming.c b/drivers/gpu/drm/msm/oplus/oppo_dc_diming.c
index ecf671aa335c..1af0c2c06517 100644
--- a/drivers/gpu/drm/msm/oplus/oppo_dc_diming.c
+++ b/drivers/gpu/drm/msm/oplus/oppo_dc_diming.c
@@ -43,7 +43,7 @@ extern atomic_t oppo_dimlayer_hbm_vblank_ref;
 extern int oppo_dc2_alpha;
 extern int oppo_seed_backlight;
 extern int oppo_panel_alpha;
-extern oppo_dc_v2_on;
+extern int oppo_dc_v2_on;
 extern ktime_t oppo_backlight_time;
 #ifdef OPLUS_FEATURE_AOD_RAMLESS
 /* Yuwei.Zhang@MULTIMEDIA.DISPLAY.LCD, 2020/09/25, sepolicy for aod ramless */
diff --git a/drivers/gpu/drm/msm/oplus/oppo_display_panel.c b/drivers/gpu/drm/msm/oplus/oppo_display_panel.c
index ad6f5e805e1b..ae2fe00085aa 100644
--- a/drivers/gpu/drm/msm/oplus/oppo_display_panel.c
+++ b/drivers/gpu/drm/msm/oplus/oppo_display_panel.c
@@ -162,7 +162,7 @@ static const struct file_operations panel_ops =
 	.write              = panel_write,
 };
 
-static int __init oppo_display_panel_init()
+static int __init oppo_display_panel_init(void)
 {
 	int rc = 0;
 
diff --git a/drivers/nfc/oppo_nfc/oppo_nfc.c b/drivers/nfc/oppo_nfc/oppo_nfc.c
index ec59ad3e1e57..52f59f57f69c 100644
--- a/drivers/nfc/oppo_nfc/oppo_nfc.c
+++ b/drivers/nfc/oppo_nfc/oppo_nfc.c
@@ -19,7 +19,7 @@
 static char current_chipset[32];
 static bool support_nfc = false;
 
-bool is_nfc_support()
+bool is_nfc_support(void)
 {
 	return support_nfc;
 }
diff --git a/drivers/power/oppo/charger_ic/oplus_battery_msm7125_R.c b/drivers/power/oppo/charger_ic/oplus_battery_msm7125_R.c
index f6d0b6060644..a1a9e7669af8 100644
--- a/drivers/power/oppo/charger_ic/oplus_battery_msm7125_R.c
+++ b/drivers/power/oppo/charger_ic/oplus_battery_msm7125_R.c
@@ -16914,7 +16914,7 @@ int oplus_chg_get_charger_subtype(void)
 }
 
 extern int oplus_pdo_select(int vbus_mv, int ibus_ma);
-int oplus_chg_set_pd_config()
+int oplus_chg_set_pd_config(void)
 {
 	int ret = -1;
 	struct oplus_chg_chip *chip = g_oplus_chip;
@@ -17065,7 +17065,7 @@ int oplus_chg_enable_qc_detect(void)
 	return ret;
 }
 
-int oplus_chg_set_qc_config()
+int oplus_chg_set_qc_config(void)
 {
 	int ret = -1;
 	struct smb_charger *chg = NULL;
diff --git a/drivers/power/oppo/gauge_ic/oplus_optiga/Platform/board.c b/drivers/power/oppo/gauge_ic/oplus_optiga/Platform/board.c
index 9f6e1039c9cc..ce06f69577a7 100644
--- a/drivers/power/oppo/gauge_ic/oplus_optiga/Platform/board.c
+++ b/drivers/power/oppo/gauge_ic/oplus_optiga/Platform/board.c
@@ -28,7 +28,7 @@ void timing_init(void)
 	g_culNvmTimeout 			= 10000;	//5.1ms
 }
 
-uint8_t get_pin()
+uint8_t get_pin(void)
 {
 	return get_optiga_pin();
 }
diff --git a/drivers/power/oppo/gauge_ic/oplus_optiga/SWI/Optiga_Swi.c b/drivers/power/oppo/gauge_ic/oplus_optiga/SWI/Optiga_Swi.c
index 3e676dab3bc7..46177780cbc6 100644
--- a/drivers/power/oppo/gauge_ic/oplus_optiga/SWI/Optiga_Swi.c
+++ b/drivers/power/oppo/gauge_ic/oplus_optiga/SWI/Optiga_Swi.c
@@ -599,7 +599,7 @@ static BOOL b_push( uint8_t ub_Data )
 *
 * \return  Size of ub_Stack
 ********************************************************************/
-static uint8_t ub_SizeOfStack()
+static uint8_t ub_SizeOfStack(void)
 {
     return ub_StackPointer;
 }
diff --git a/drivers/power/oppo/gauge_ic/oplus_optiga/oplus_optiga.c b/drivers/power/oppo/gauge_ic/oplus_optiga/oplus_optiga.c
index 09b19fa1b59e..4ead18e97786 100644
--- a/drivers/power/oppo/gauge_ic/oplus_optiga/oplus_optiga.c
+++ b/drivers/power/oppo/gauge_ic/oplus_optiga/oplus_optiga.c
@@ -123,7 +123,7 @@ void oem_gpio_control(unsigned gpio, int level)
 }
 EXPORT_SYMBOL_GPL(oem_gpio_control);
 
-static try_count = 0;
+static int try_count = 0;
 void set_optiga_pin(uint8_t level){
 	int en = level;
 
diff --git a/drivers/power/oppo/oplus_vooc.c b/drivers/power/oppo/oplus_vooc.c
index f727f511e123..fce671acf19f 100644
--- a/drivers/power/oppo/oplus_vooc.c
+++ b/drivers/power/oppo/oplus_vooc.c
@@ -86,7 +86,7 @@ static bool oplus_vooc_is_battemp_exit(void)
 		return false;
 }
 
-void oplus_vooc_battery_update()
+void oplus_vooc_battery_update(void)
 {
 	struct oplus_vooc_chip *chip = g_vooc_chip;
 /*
@@ -1842,7 +1842,7 @@ void oplus_vooc_set_fastchg_to_warm_false(void)
 	}
 }
 
-bool oplus_vooc_get_fastchg_low_temp_full()
+bool oplus_vooc_get_fastchg_low_temp_full(void)
 {
 	if (!g_vooc_chip) {
 		return false;
diff --git a/drivers/regulator/qcom_pm8008-regulator.c b/drivers/regulator/qcom_pm8008-regulator.c
index 4b15cdc4c17d..0c6d9029e61c 100644
--- a/drivers/regulator/qcom_pm8008-regulator.c
+++ b/drivers/regulator/qcom_pm8008-regulator.c
@@ -756,7 +756,7 @@ static int pm8008_register_ldo(struct pm8008_regulator *pm8008_reg,
 
 #ifdef VENDOR_EDIT
 /*zhixian.Mai @Cam.Drv, 2019/9/29, Add for PM8008 i2c error */
-void  pm8008_do_reset()
+void  pm8008_do_reset(void)
 {
 	unsigned int val = 0;
 	int rc = 0;
diff --git a/drivers/soc/oplus/oplus_nandswap/nandswap.h b/drivers/soc/oplus/oplus_nandswap/nandswap.h
index 5671411b7592..2c391df79806 100644
--- a/drivers/soc/oplus/oplus_nandswap/nandswap.h
+++ b/drivers/soc/oplus/oplus_nandswap/nandswap.h
@@ -30,7 +30,7 @@ enum {
 };
 
 extern struct task_struct *nswapoutd;
-static inline bool current_is_nswapoutd()
+static inline bool current_is_nswapoutd(void)
 {
 	return current == nswapoutd;
 }
diff --git a/drivers/soc/oplus/sensor/oplus_sensor_devinfo.c b/drivers/soc/oplus/sensor/oplus_sensor_devinfo.c
index 8ec648422453..40df9ce0ca61 100644
--- a/drivers/soc/oplus/sensor/oplus_sensor_devinfo.c
+++ b/drivers/soc/oplus/sensor/oplus_sensor_devinfo.c
@@ -33,7 +33,7 @@ __attribute__((weak)) void oplus_device_dir_redirect(struct sensor_info * chip)
     pr_info("%s oplus_device_dir_redirect \n", __func__);
 };
 
-__attribute__((weak)) unsigned int get_serialID()
+__attribute__((weak)) unsigned int get_serialID(void)
 {
     return 0;
 };
@@ -1033,7 +1033,7 @@ static struct file_operations row_coe_fops = {
     .write = row_coe_write_proc,
 };
 
-static int oplus_als_cali_data_init()
+static int oplus_als_cali_data_init(void)
 {
     int rc = 0;
     struct proc_dir_entry *pentry;
diff --git a/drivers/soc/oplus/system/dump_device_info/dump_device_info.c b/drivers/soc/oplus/system/dump_device_info/dump_device_info.c
index 9b77f6b000de..5d08647a64fc 100644
--- a/drivers/soc/oplus/system/dump_device_info/dump_device_info.c
+++ b/drivers/soc/oplus/system/dump_device_info/dump_device_info.c
@@ -107,7 +107,7 @@ static void  pstore_device_info_init(void )
         psinfo->bufsize = oldsize ;
 }
 
-static void board_soc_info_init()
+static void board_soc_info_init(void)
 {
 
         scnprintf(pcb_version, sizeof(pcb_version), "%x", get_PCB_Version()); 
diff --git a/drivers/soc/oplus/system/oplus_project/qcom/oplus_project.c b/drivers/soc/oplus/system/oplus_project/qcom/oplus_project.c
index 946ec5dc521c..255ef1de151f 100644
--- a/drivers/soc/oplus/system/oplus_project/qcom/oplus_project.c
+++ b/drivers/soc/oplus/system/oplus_project/qcom/oplus_project.c
@@ -341,7 +341,7 @@ uint32_t get_oppo_feature(enum F_INDEX index)
 EXPORT_SYMBOL(get_oppo_feature);
 
 #define SERIALNO_LEN 16
-unsigned int get_serialID()
+unsigned int get_serialID(void)
 {
     unsigned int serial_id = 0xFFFFFFFF;
 
@@ -571,7 +571,7 @@ static int project_read_func(struct seq_file *s, void *v)
     return 0;
 }
 
-unsigned int get_cdt_version()
+unsigned int get_cdt_version(void)
 {
     init_project_version();
 
diff --git a/drivers/soc/oplus/system/uboot_log/uboot_log.c b/drivers/soc/oplus/system/uboot_log/uboot_log.c
index e7fdd6d1e144..537922c52be2 100644
--- a/drivers/soc/oplus/system/uboot_log/uboot_log.c
+++ b/drivers/soc/oplus/system/uboot_log/uboot_log.c
@@ -59,7 +59,7 @@ static u32 	uboot_log_buf_len;
 /*
  * init uboot/kboot log buffer addr/size
  */
-static int uboot_kboot_buffer_init()
+static int uboot_kboot_buffer_init(void)
 {
 	struct reserved_mem *r_mem = NULL;
 	struct device_node *reserved_memory, *kboot_uboot_logmemory;
@@ -191,7 +191,7 @@ int ubootback_thread_fn(void *data)
 	return 0;
 }
 
-static int __init kernel_uboot_log_init()
+static int __init kernel_uboot_log_init(void)
 {
 	struct proc_dir_entry *pEntry = NULL;
 
diff --git a/drivers/soc/qcom/oppo_watchdog_util.c b/drivers/soc/qcom/oppo_watchdog_util.c
index 35a460f02cde..9febf8d05786 100644
--- a/drivers/soc/qcom/oppo_watchdog_util.c
+++ b/drivers/soc/qcom/oppo_watchdog_util.c
@@ -139,7 +139,7 @@ static void print_top10_irqs(void)
 		irqno_sort[8], o_irq_counter.irqs_delta[irqno_sort[8]], irqno_sort[9], o_irq_counter.irqs_delta[irqno_sort[9]], o_irq_counter.all_irqs_delta);
 }
 
-void dump_cpu_online_mask()
+void dump_cpu_online_mask(void)
 {
 	static char alive_mask_buf[MASK_SIZE];
 	struct cpumask avail_mask;
@@ -164,7 +164,7 @@ void get_cpu_ping_mask(cpumask_t *pmask)
 		*cpumask_bits(&avail_mask), *cpumask_bits(pmask), o_irq_counter.all_irqs_delta);
 }
 
-void print_smp_call_cpu()
+void print_smp_call_cpu(void)
 {
 	printk(KERN_INFO "cpu of last smp_call_function_any: %d\n",
 		smp_call_any_cpu);
@@ -228,7 +228,7 @@ int try_to_recover_pending(struct task_struct *w_task)
 	return 0;
 }
 
-void reset_recovery_tried()
+void reset_recovery_tried(void)
 {
 	recovery_tried = 0;
 }
diff --git a/drivers/staging/qca-wifi-host-cmn/hif/src/ce/ce_service_legacy.c b/drivers/staging/qca-wifi-host-cmn/hif/src/ce/ce_service_legacy.c
index 0997fccce51a..366069e97a25 100644
--- a/drivers/staging/qca-wifi-host-cmn/hif/src/ce/ce_service_legacy.c
+++ b/drivers/staging/qca-wifi-host-cmn/hif/src/ce/ce_service_legacy.c
@@ -1317,7 +1317,7 @@ struct ce_ops ce_service_legacy = {
 #endif
 };
 
-struct ce_ops *ce_services_legacy()
+struct ce_ops *ce_services_legacy(void)
 {
 	return &ce_service_legacy;
 }
diff --git a/drivers/staging/qca-wifi-host-cmn/target_if/core/src/target_if_main.c b/drivers/staging/qca-wifi-host-cmn/target_if/core/src/target_if_main.c
index a622ca425d36..a565aab1d547 100644
--- a/drivers/staging/qca-wifi-host-cmn/target_if/core/src/target_if_main.c
+++ b/drivers/staging/qca-wifi-host-cmn/target_if/core/src/target_if_main.c
@@ -88,7 +88,7 @@
 
 static struct target_if_ctx *g_target_if_ctx;
 
-struct target_if_ctx *target_if_get_ctx()
+struct target_if_ctx *target_if_get_ctx(void)
 {
 	return g_target_if_ctx;
 }
diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c
index 0fe851a1a140..2a8b03b082cc 100644
--- a/kernel/sched/rt.c
+++ b/kernel/sched/rt.c
@@ -1479,7 +1479,7 @@ task_may_not_preempt(struct task_struct *task, int cpu)
 }
 #if defined (CONFIG_SCHED_WALT) && defined (OPLUS_FEATURE_UIFIRST)
 extern bool is_sf(struct task_struct *p);
-extern sysctl_slide_boost_enabled;
+extern int sysctl_slide_boost_enabled;
 #endif
 static int
 select_task_rq_rt(struct task_struct *p, int cpu, int sd_flag, int flags,
diff --git a/net/oplus_nwpower/oplus_nwpower.c b/net/oplus_nwpower/oplus_nwpower.c
index dbc64c13301d..d943c2fa94fc 100644
--- a/net/oplus_nwpower/oplus_nwpower.c
+++ b/net/oplus_nwpower/oplus_nwpower.c
@@ -616,7 +616,7 @@ static void oplus_print_ipa_wakeup(bool unsl)
 	}
 }
 
-static void oplus_reset_qrtr_wakeup()
+static void oplus_reset_qrtr_wakeup(void)
 {
 	int i;
 
@@ -636,7 +636,7 @@ static void oplus_reset_qrtr_wakeup()
 	nw_pcie2_wakeup_times = 0;
 }
 
-static void oplus_reset_ipa_wakeup()
+static void oplus_reset_ipa_wakeup(void)
 {
 	int i;
 	int j;
diff --git a/net/oplus_sla/oplus_sla.c b/net/oplus_sla/oplus_sla.c
index fca40ccd216a..8a6e9d6ed8ba 100644
--- a/net/oplus_sla/oplus_sla.c
+++ b/net/oplus_sla/oplus_sla.c
@@ -811,7 +811,7 @@ static int enable_oplus_sla_module(struct nlmsghdr *nlh)
 	return 0;
 }
 
-static int enable_oplus_limit_speed()
+static int enable_oplus_limit_speed(void)
 {
 	sla_write_lock();
 	rate_limit_info.rate_limit_enable = 1;
@@ -820,7 +820,7 @@ static int enable_oplus_limit_speed()
 	return 0;
 }
 
-static int disable_oplus_limit_speed()
+static int disable_oplus_limit_speed(void)
 {
 	sla_write_lock();
 	rate_limit_info.rate_limit_enable = 0;
diff --git a/techpack/audio/4.0/asoc/codecs/sia81xx/sia81xx_socket.c b/techpack/audio/4.0/asoc/codecs/sia81xx/sia81xx_socket.c
index 102cdc9ea9d7..ebaf3f136e15 100644
--- a/techpack/audio/4.0/asoc/codecs/sia81xx/sia81xx_socket.c
+++ b/techpack/audio/4.0/asoc/codecs/sia81xx/sia81xx_socket.c
@@ -546,7 +546,7 @@ end :
 	return 0;
 }
 
-int sia81xx_open_sock_server()
+int sia81xx_open_sock_server(void)
 {
 	int ret = 0;
 	struct sockaddr_in s_addr;
diff --git a/techpack/audio/4.0/asoc/kona.c b/techpack/audio/4.0/asoc/kona.c
index b795e7069390..5cd9b3ed25d0 100644
--- a/techpack/audio/4.0/asoc/kona.c
+++ b/techpack/audio/4.0/asoc/kona.c
@@ -8336,7 +8336,7 @@ static const struct file_operations smartpa_id_proc_ops = {
 };
 
 /* chengong@ODM_LQ@Multimedia.Audio,2019/10/29,add for smartpa evt1 */
-static void odm_mi2s_be_dai_rename()
+static void odm_mi2s_be_dai_rename(void)
 {
 	int i = 0;