mm: remove mm/io-mapping.c

ljskernel · akpm00 · commit 9a4f90e24661 · 2025-08-02T12:06:10.000-07:00
This is dead code, which was used from commit b739f12 ("i915: use io_mapping_map_user") but reverted a month later by commit 0e4fe0c ("Revert "i915: use io_mapping_map_user"") back in 2021. Since then nobody has used it, so remove it. [akpm@linux-foundation.org: update Documentation/core-api/mm-api.rst, per Vlastimil] Link: https://lkml.kernel.org/r/20250725142901.81502-1-lorenzo.stoakes@oracle.com Signed-off-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Acked-by: David Hildenbrand <david@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Cc: Liam Howlett <liam.howlett@oracle.com> Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Mike Rapoport <rppt@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
diff --git a/Documentation/core-api/mm-api.rst b/Documentation/core-api/mm-api.rst
@@ -139,4 +139,3 @@ More Memory Management Functions
 .. kernel-doc:: mm/mmu_notifier.c
 .. kernel-doc:: mm/balloon_compaction.c
 .. kernel-doc:: mm/huge_memory.c
-.. kernel-doc:: mm/io-mapping.c
diff --git a/include/linux/io-mapping.h b/include/linux/io-mapping.h
@@ -225,7 +225,4 @@ io_mapping_free(struct io_mapping *iomap)
 	kfree(iomap);
 }
 
-int io_mapping_map_user(struct io_mapping *iomap, struct vm_area_struct *vma,
-		unsigned long addr, unsigned long pfn, unsigned long size);
-
 #endif /* _LINUX_IO_MAPPING_H */
diff --git a/mm/Kconfig b/mm/Kconfig
@@ -1242,10 +1242,6 @@ config KMAP_LOCAL
 config KMAP_LOCAL_NON_LINEAR_PTE_ARRAY
 	bool
 
-# struct io_mapping based helper.  Selected by drivers that need them
-config IO_MAPPING
-	bool
-
 config MEMFD_CREATE
 	bool "Enable memfd_create() system call" if EXPERT
 
diff --git a/mm/Makefile b/mm/Makefile
@@ -141,7 +141,6 @@ obj-$(CONFIG_MEMFD_CREATE) += memfd.o
 obj-$(CONFIG_MAPPING_DIRTY_HELPERS) += mapping_dirty_helpers.o
 obj-$(CONFIG_PTDUMP) += ptdump.o
 obj-$(CONFIG_PAGE_REPORTING) += page_reporting.o
-obj-$(CONFIG_IO_MAPPING) += io-mapping.o
 obj-$(CONFIG_HAVE_BOOTMEM_INFO_NODE) += bootmem_info.o
 obj-$(CONFIG_GENERIC_IOREMAP) += ioremap.o
 obj-$(CONFIG_SHRINKER_DEBUG) += shrinker_debug.o
diff --git a/mm/io-mapping.c b/mm/io-mapping.c

Original file line number	Diff line number	Diff line change
`@@ -225,7 +225,4 @@ io_mapping_free(struct io_mapping *iomap)`
`225`	`225`	`kfree(iomap);`
`226`	`226`	`}`
`227`	`227`
`228`		`-int io_mapping_map_user(struct io_mapping iomap, struct vm_area_struct vma,`
`229`		`- unsigned long addr, unsigned long pfn, unsigned long size);`
`230`		`-`
`231`	`228`	`#endif /* _LINUX_IO_MAPPING_H */`