Commit 9a4f90e2 authored by Lorenzo Stoakes's avatar Lorenzo Stoakes Committed by Andrew Morton
Browse files

mm: remove mm/io-mapping.c 

This is dead code, which was used from commit b739f125 ("i915: use
io_mapping_map_user") but reverted a month later by commit 0e4fe0c9
("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: default avatarLorenzo Stoakes <lorenzo.stoakes@oracle.com>
Acked-by: default avatarDavid Hildenbrand <david@redhat.com>
Acked-by: default avatarVlastimil 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: default avatarAndrew Morton <akpm@linux-foundation.org>
parent 22d02290

Documentation/core-api/mm-api.rst

+0 −1
Original line number Diff line number Diff line
@@ -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

include/linux/io-mapping.h

+0 −3
Original line number Diff line number Diff line
@@ -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 */

mm/Kconfig

+0 −4
Original line number Diff line number Diff line
@@ -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

mm/Makefile

+0 −1
Original line number Diff line number Diff line
@@ -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

mm/io-mapping.c

deleted100644 → 0
+0 −30
Original line number Diff line number Diff line 
// SPDX-License-Identifier: GPL-2.0-only



#include <linux/mm.h>

#include <linux/io-mapping.h>



/**

 * io_mapping_map_user - remap an I/O mapping to userspace

 * @iomap: the source io_mapping

 * @vma: user vma to map to

 * @addr: target user address to start at

 * @pfn: physical address of kernel memory

 * @size: size of map area

 *

 *  Note: this is only safe if the mm semaphore is held when called.

 */

int io_mapping_map_user(struct io_mapping *iomap, struct vm_area_struct *vma,

		unsigned long addr, unsigned long pfn, unsigned long size)

{

	vm_flags_t expected_flags = VM_PFNMAP | VM_DONTEXPAND | VM_DONTDUMP;



	if (WARN_ON_ONCE((vma->vm_flags & expected_flags) != expected_flags))

		return -EINVAL;



	pgprot_t remap_prot = __pgprot((pgprot_val(iomap->prot) & _PAGE_CACHE_MASK) |

				       (pgprot_val(vma->vm_page_prot) & ~_PAGE_CACHE_MASK));



	/* We rely on prevalidation of the io-mapping to skip pfnmap tracking. */

	return remap_pfn_range_notrack(vma, addr, pfn, size, remap_prot);

}

EXPORT_SYMBOL_GPL(io_mapping_map_user);