diff --git a/sys/arm/arm/busdma_machdep.c b/sys/arm/arm/busdma_machdep.c
index 8a06e7245cd..caa9ae43834 100644
--- a/sys/arm/arm/busdma_machdep.c
+++ b/sys/arm/arm/busdma_machdep.c
@@ -419,9 +419,7 @@ must_bounce(bus_dma_tag_t dmat, bus_dmamap_t map, bus_addr_t paddr,
 
 /*
  * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example).  Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg.  Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
+ * busdma_swi, for example).
  */
 void
 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
diff --git a/sys/arm64/arm64/busdma_machdep.c b/sys/arm64/arm64/busdma_machdep.c
index a4c6d206558..5d42d4e58c2 100644
--- a/sys/arm64/arm64/busdma_machdep.c
+++ b/sys/arm64/arm64/busdma_machdep.c
@@ -53,9 +53,7 @@ __FBSDID("$FreeBSD$");
 
 /*
  * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example).  Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg.  Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
+ * busdma_swi, for example).
  */
 void
 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
diff --git a/sys/mips/mips/busdma_machdep.c b/sys/mips/mips/busdma_machdep.c
index c707af167ab..80e57cd0414 100644
--- a/sys/mips/mips/busdma_machdep.c
+++ b/sys/mips/mips/busdma_machdep.c
@@ -298,9 +298,7 @@ _bus_dma_can_bounce(vm_offset_t lowaddr, vm_offset_t highaddr)
 
 /*
  * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example).  Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg.  Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
+ * busdma_swi, for example).
  */
 void
 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
diff --git a/sys/powerpc/powerpc/busdma_machdep.c b/sys/powerpc/powerpc/busdma_machdep.c
index 94f5f501501..d513b7e6553 100644
--- a/sys/powerpc/powerpc/busdma_machdep.c
+++ b/sys/powerpc/powerpc/busdma_machdep.c
@@ -186,9 +186,7 @@ run_filter(bus_dma_tag_t dmat, bus_addr_t paddr)
 
 /*
  * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example).  Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg.  Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
+ * busdma_swi, for example).
  */
 void
 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
diff --git a/sys/riscv/riscv/busdma_machdep.c b/sys/riscv/riscv/busdma_machdep.c
index 7b1c3027bad..f510a3c437d 100644
--- a/sys/riscv/riscv/busdma_machdep.c
+++ b/sys/riscv/riscv/busdma_machdep.c
@@ -53,9 +53,7 @@ __FBSDID("$FreeBSD$");
 
 /*
  * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example).  Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg.  Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
+ * busdma_swi, for example).
  */
 void
 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)
diff --git a/sys/x86/x86/busdma_machdep.c b/sys/x86/x86/busdma_machdep.c
index d0f0526a75c..d07cad21c47 100644
--- a/sys/x86/x86/busdma_machdep.c
+++ b/sys/x86/x86/busdma_machdep.c
@@ -57,9 +57,7 @@ __FBSDID("$FreeBSD$");
 
 /*
  * Convenience function for manipulating driver locks from busdma (during
- * busdma_swi, for example).  Drivers that don't provide their own locks
- * should specify &Giant to dmat->lockfuncarg.  Drivers that use their own
- * non-mutex locking scheme don't have to use this at all.
+ * busdma_swi, for example).
  */
 void
 busdma_lock_mutex(void *arg, bus_dma_lock_op_t op)