diff --git a/drivers/atm/horizon.c b/drivers/atm/horizon.c
index 5ddc203206b8fb..9660adb2f2866e 100644
--- a/drivers/atm/horizon.c
+++ b/drivers/atm/horizon.c
@@ -2182,10 +2182,10 @@ static int hrz_open (struct atm_vcc *atm_vcc)
   
   // Part of the job is done by atm_pcr_goal which gives us a PCR
   // specification which says: EITHER grab the maximum available PCR
-  // (and perhaps a lower bound which we musn't pass), OR grab this
+  // (and perhaps a lower bound which we mustn't pass), OR grab this
   // amount, rounding down if you have to (and perhaps a lower bound
-  // which we musn't pass) OR grab this amount, rounding up if you
-  // have to (and perhaps an upper bound which we musn't pass). If any
+  // which we mustn't pass) OR grab this amount, rounding up if you
+  // have to (and perhaps an upper bound which we mustn't pass). If any
   // bounds ARE passed we fail. Note that rounding is only rounding to
   // match device limitations, we do not round down to satisfy
   // bandwidth availability even if this would not violate any given
diff --git a/drivers/iio/adc/stm32-adc-core.c b/drivers/iio/adc/stm32-adc-core.c
index 40be7d9fadbf58..011db67632fdd2 100644
--- a/drivers/iio/adc/stm32-adc-core.c
+++ b/drivers/iio/adc/stm32-adc-core.c
@@ -206,7 +206,7 @@ static int stm32h7_adc_clk_sel(struct platform_device *pdev,
 	if (priv->aclk) {
 		/*
 		 * Asynchronous clock modes (e.g. ckmode == 0)
-		 * From spec: PLL output musn't exceed max rate
+		 * From spec: PLL output mustn't exceed max rate
 		 */
 		rate = clk_get_rate(priv->aclk);
 		if (!rate) {
diff --git a/kernel/hung_task.c b/kernel/hung_task.c
index 751593ed7c0b0b..92e9c2bd7e60f1 100644
--- a/kernel/hung_task.c
+++ b/kernel/hung_task.c
@@ -90,7 +90,7 @@ static void check_hung_task(struct task_struct *t, unsigned long timeout)
 	/*
 	 * When a freshly created task is scheduled once, changes its state to
 	 * TASK_UNINTERRUPTIBLE without having ever been switched out once, it
-	 * musn't be checked.
+	 * mustn't be checked.
 	 */
 	if (unlikely(!switch_count))
 		return;