diff --git a/boards/arm/at32/at32f437-mini/src/at32_ethernet.c b/boards/arm/at32/at32f437-mini/src/at32_ethernet.c
index 2821c61a4c..390598ceb9 100644
--- a/boards/arm/at32/at32f437-mini/src/at32_ethernet.c
+++ b/boards/arm/at32/at32f437-mini/src/at32_ethernet.c
@@ -81,9 +81,8 @@
  * Private Data
  ****************************************************************************/
 
-static spinlock_t g_ethmac_lock = SP_UNLOCKED;
-
 #ifdef HAVE_NETMONITOR
+static spinlock_t g_ethmac_lock = SP_UNLOCKED;
 static xcpt_t g_ethmac_handler;
 static void  *g_ethmac_arg;
 #endif
diff --git a/boards/arm/imxrt/imxrt1020-evk/src/imxrt_ethernet.c b/boards/arm/imxrt/imxrt1020-evk/src/imxrt_ethernet.c
index 9bdd3f07f6..185130095e 100644
--- a/boards/arm/imxrt/imxrt1020-evk/src/imxrt_ethernet.c
+++ b/boards/arm/imxrt/imxrt1020-evk/src/imxrt_ethernet.c
@@ -76,7 +76,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef GPIO_ENET_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/imxrt/imxrt1050-evk/src/imxrt_ethernet.c b/boards/arm/imxrt/imxrt1050-evk/src/imxrt_ethernet.c
index fea90e458b..30e499cf65 100644
--- a/boards/arm/imxrt/imxrt1050-evk/src/imxrt_ethernet.c
+++ b/boards/arm/imxrt/imxrt1050-evk/src/imxrt_ethernet.c
@@ -79,7 +79,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_IMXRT_GPIO1_0_15_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/imxrt/imxrt1060-evk/src/imxrt_ethernet.c b/boards/arm/imxrt/imxrt1060-evk/src/imxrt_ethernet.c
index 18c6cf7885..dc643e48dc 100644
--- a/boards/arm/imxrt/imxrt1060-evk/src/imxrt_ethernet.c
+++ b/boards/arm/imxrt/imxrt1060-evk/src/imxrt_ethernet.c
@@ -77,7 +77,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_IMXRT_GPIO1_0_15_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/imxrt/imxrt1064-evk/src/imxrt_ethernet.c b/boards/arm/imxrt/imxrt1064-evk/src/imxrt_ethernet.c
index 0dcfc4da65..00d7ad09bb 100644
--- a/boards/arm/imxrt/imxrt1064-evk/src/imxrt_ethernet.c
+++ b/boards/arm/imxrt/imxrt1064-evk/src/imxrt_ethernet.c
@@ -77,7 +77,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_IMXRT_GPIO1_0_15_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/imxrt/teensy-4.x/src/imxrt_ethernet.c b/boards/arm/imxrt/teensy-4.x/src/imxrt_ethernet.c
index 6053bcaec9..d32c21fef9 100644
--- a/boards/arm/imxrt/teensy-4.x/src/imxrt_ethernet.c
+++ b/boards/arm/imxrt/teensy-4.x/src/imxrt_ethernet.c
@@ -77,7 +77,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_IMXRT_GPIO1_0_15_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/sama5/sama5d2-xult/src/sam_ethernet.c b/boards/arm/sama5/sama5d2-xult/src/sam_ethernet.c
index f6424c3ba1..e7ebf6e943 100644
--- a/boards/arm/sama5/sama5d2-xult/src/sam_ethernet.c
+++ b/boards/arm/sama5/sama5d2-xult/src/sam_ethernet.c
@@ -86,7 +86,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_SAMA5_PIOE_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/sama5/sama5d3x-ek/src/sam_ethernet.c b/boards/arm/sama5/sama5d3x-ek/src/sam_ethernet.c
index e3d32befad..33df048ea7 100644
--- a/boards/arm/sama5/sama5d3x-ek/src/sam_ethernet.c
+++ b/boards/arm/sama5/sama5d3x-ek/src/sam_ethernet.c
@@ -86,7 +86,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_SAMA5_PIOE_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/samv7/same70-xplained/src/sam_ethernet.c b/boards/arm/samv7/same70-xplained/src/sam_ethernet.c
index d100c42689..8f91e63110 100644
--- a/boards/arm/samv7/same70-xplained/src/sam_ethernet.c
+++ b/boards/arm/samv7/same70-xplained/src/sam_ethernet.c
@@ -82,7 +82,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_SAMV7_GPIOA_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/samv7/samv71-xult/src/sam_ethernet.c b/boards/arm/samv7/samv71-xult/src/sam_ethernet.c
index 7bcdb6be69..2bc8cbd708 100644
--- a/boards/arm/samv7/samv71-xult/src/sam_ethernet.c
+++ b/boards/arm/samv7/samv71-xult/src/sam_ethernet.c
@@ -82,7 +82,9 @@
  * Private Data
  ****************************************************************************/
 
+#ifdef CONFIG_SAMV7_GPIOA_IRQ
 static spinlock_t g_phy_lock = SP_UNLOCKED;
+#endif
 
 /****************************************************************************
  * Private Functions
diff --git a/boards/arm/stm32/stm32f4discovery/src/stm32_ethernet.c b/boards/arm/stm32/stm32f4discovery/src/stm32_ethernet.c
index 45e722039f..9a39e6ef61 100644
--- a/boards/arm/stm32/stm32f4discovery/src/stm32_ethernet.c
+++ b/boards/arm/stm32/stm32f4discovery/src/stm32_ethernet.c
@@ -81,9 +81,8 @@
  * Private Data
  ****************************************************************************/
 
-static spinlock_t g_phy_lock = SP_UNLOCKED;
-
 #ifdef HAVE_NETMONITOR
+static spinlock_t g_phy_lock = SP_UNLOCKED;
 static xcpt_t g_ethmac_handler;
 static void  *g_ethmac_arg;
 #endif