diff --git a/arch/arm/src/gd32f4/gd32f4xx_serial.c b/arch/arm/src/gd32f4/gd32f4xx_serial.c
index bdd5a822f66..b653b5ad29d 100644
--- a/arch/arm/src/gd32f4/gd32f4xx_serial.c
+++ b/arch/arm/src/gd32f4/gd32f4xx_serial.c
@@ -158,6 +158,7 @@ struct up_dev_s
   const uint8_t   stop_2bits;    /* True: Configure with 2 stop bits instead of 1 */
   const uint32_t  tx_gpio;       /* USART TX GPIO pin configuration */
   const uint32_t  rx_gpio;       /* USART RX GPIO pin configuration */
+  spinlock_t      lock;          /* Spinlock */
 
 #  ifdef CONFIG_SERIAL_IFLOWCONTROL
   const uint32_t  rts_gpio;      /* UART RTS GPIO pin configuration */
diff --git a/arch/arm/src/imxrt/imxrt_edma.c b/arch/arm/src/imxrt/imxrt_edma.c
index b1413dece13..5ebbc24ed4b 100644
--- a/arch/arm/src/imxrt/imxrt_edma.c
+++ b/arch/arm/src/imxrt/imxrt_edma.c
@@ -145,6 +145,7 @@ struct imxrt_edma_s
   /* This array describes each DMA channel */
 
   struct imxrt_dmach_s dmach[IMXRT_EDMA_NCHANNELS];
+  spinlock_t lock;                /* Spinlock */
 };
 
 /****************************************************************************
diff --git a/arch/arm/src/stm32u5/stm32_serial.c b/arch/arm/src/stm32u5/stm32_serial.c
index 810e4d1844c..8740919d961 100644
--- a/arch/arm/src/stm32u5/stm32_serial.c
+++ b/arch/arm/src/stm32u5/stm32_serial.c
@@ -501,7 +501,7 @@ static struct stm32_serial_s g_lpuart1priv =
   .rs485_dir_polarity = true,
 #    endif
 #  endif
-  .lock =             = SP_UNLOCKED,
+  .lock               = SP_UNLOCKED,
 };
 #endif
 
@@ -623,7 +623,7 @@ static struct stm32_serial_s g_usart2priv =
   .rs485_dir_polarity = true,
 #    endif
 #  endif
-  .lock =             = SP_UNLOCKED,
+  .lock               = SP_UNLOCKED,
 };
 #endif
 
@@ -685,7 +685,7 @@ static struct stm32_serial_s g_usart3priv =
   .rs485_dir_polarity = true,
 #    endif
 #  endif
-  .lock =             = SP_UNLOCKED,
+  .lock               = SP_UNLOCKED,
 };
 #endif
 
@@ -747,7 +747,7 @@ static struct stm32_serial_s g_uart4priv =
   .rs485_dir_polarity = true,
 #    endif
 #  endif
-  .lock =             = SP_UNLOCKED,
+  .lock               = SP_UNLOCKED,
 };
 #endif
 
@@ -809,7 +809,7 @@ static struct stm32_serial_s g_uart5priv =
   .rs485_dir_polarity = true,
 #    endif
 #  endif
-  .lock =             = SP_UNLOCKED,
+  .lock               = SP_UNLOCKED,
 };
 #endif