diff --git a/Documentation/x86/x86_64/boot-options.rst b/Documentation/x86/x86_64/boot-options.rst
index 6a4285a3c7a4..2b98efb5ba7f 100644
--- a/Documentation/x86/x86_64/boot-options.rst
+++ b/Documentation/x86/x86_64/boot-options.rst
@@ -230,7 +230,7 @@ IOMMU (input/output memory management unit)
 ===========================================
 Multiple x86-64 PCI-DMA mapping implementations exist, for example:
 
-   1. <lib/dma-direct.c>: use no hardware/software IOMMU at all
+   1. <kernel/dma/direct.c>: use no hardware/software IOMMU at all
       (e.g. because you have < 3 GB memory).
       Kernel boot message: "PCI-DMA: Disabling IOMMU"
 
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index c9cfa760cd57..ab8d25d3e358 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -256,7 +256,7 @@ __initcall(register_memory);
  * This function checks if the reserved crashkernel is allowed on the specific
  * IA64 machine flavour. Machines without an IO TLB use swiotlb and require
  * some memory below 4 GB (i.e. in 32 bit area), see the implementation of
- * lib/swiotlb.c. The hpzx1 architecture has an IO TLB but cannot use that
+ * kernel/dma/swiotlb.c. The hpzx1 architecture has an IO TLB but cannot use that
  * in kdump case. See the comment in sba_init() in sba_iommu.c.
  *
  * So, the only machvec that really supports loading the kdump kernel
diff --git a/arch/x86/kernel/pci-swiotlb.c b/arch/x86/kernel/pci-swiotlb.c
index 5f5302028a9a..c2cfa5e7c152 100644
--- a/arch/x86/kernel/pci-swiotlb.c
+++ b/arch/x86/kernel/pci-swiotlb.c
@@ -1,5 +1,4 @@
 // SPDX-License-Identifier: GPL-2.0
-/* Glue code to lib/swiotlb.c */
 
 #include <linux/pci.h>
 #include <linux/cache.h>
diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
index bbe35bf879f5..77ea96b794bd 100644
--- a/arch/x86/kernel/setup.c
+++ b/arch/x86/kernel/setup.c
@@ -486,7 +486,7 @@ static int __init reserve_crashkernel_low(void)
 	ret = parse_crashkernel_low(boot_command_line, total_low_mem, &low_size, &base);
 	if (ret) {
 		/*
-		 * two parts from lib/swiotlb.c:
+		 * two parts from kernel/dma/swiotlb.c:
 		 * -swiotlb size: user-specified with swiotlb= or default.
 		 *
 		 * -swiotlb overflow buffer: now hardcoded to 32k. We round it
diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c
index 97bbc12dd6b2..6269a175385d 100644
--- a/arch/x86/pci/sta2x11-fixup.c
+++ b/arch/x86/pci/sta2x11-fixup.c
@@ -1,8 +1,6 @@
 // SPDX-License-Identifier: GPL-2.0-only
 /*
- * arch/x86/pci/sta2x11-fixup.c
- * glue code for lib/swiotlb.c and DMA translation between STA2x11
- * AMBA memory mapping and the X86 memory mapping
+ * DMA translation between STA2x11 AMBA memory mapping and the x86 memory mapping
  *
  * ST Microelectronics ConneXt (STA2X11/STA2X10)
  *