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mm: remove mm/io-mapping.c

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This is dead code, which was used from commit b739f125e4 ("i915: use
io_mapping_map_user") but reverted a month later by commit 0e4fe0c9f2
("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>
This commit is contained in:
Lorenzo Stoakes 2025-07-25 15:29:01 +01:00 committed by Andrew Morton
parent 22d0229093
commit 9a4f90e246
5 changed files with 0 additions and 39 deletions
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1
Documentation/core-api/mm-api.rst
View File

@ -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

3
include/linux/io-mapping.h
View File

@ -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 */

4
mm/Kconfig
View File

@ -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

1
mm/Makefile
View File

@ -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

30
mm/io-mapping.c
View File

@ -1,30 +0,0 @@
// 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);