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John Hubbard 6a005645ed mm/gup: documentation fix for pin_user_pages*() APIs 
All of the pin_user_pages*() API calls will cause pages to be
dma-pinned.  As such, they are all suitable for either DMA, RDMA, and/or
Direct IO.

The documentation should say so, but it was instead saying that three of
the API calls were only suitable for Direct IO.  This was discovered
when a reviewer wondered why an API call that specifically recommended
against Case 2 (DMA/RDMA) was being used in a DMA situation [1].

Fix this by simply deleting those claims.  The gup.c comments already
refer to the more extensive Documentation/core-api/pin_user_pages.rst,
which does have the correct guidance.  So let's just write it once,
there.

[1] https://lore.kernel.org/r/20200529074658.GM30374@kadam

Signed-off-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Pankaj Gupta <pankaj.gupta.linux@gmail.com>
Acked-by: Souptick Joarder <jrdr.linux@gmail.com>
Cc: Dan Carpenter <dan.carpenter@oracle.com>
Cc: Jan Kara <jack@suse.cz>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: http://lkml.kernel.org/r/20200529084515.46259-1-jhubbard@nvidia.com
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-06-08 11:05:56 -07:00
..
kasan
mm: remove __ARCH_HAS_5LEVEL_HACK and include/asm-generic/5level-fixup.h
2020-06-04 19:06:21 -07:00
backing-dev.c
bdi: remove the name field in struct backing_dev_info
2020-05-09 16:15:13 -06:00
balloon_compaction.c
mm/balloon_compaction: suppress allocation warnings
2019-09-04 07:42:01 -04:00
cleancache.c
Driver Core and debugfs changes for 5.3-rc1
2019-07-12 12:24:03 -07:00
cma_debug.c
mm/cma_debug.c: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
cma.c
mm: cma: NUMA node interface
2020-04-10 15:36:21 -07:00
cma.h
…
compaction.c
mm/compaction: fix a typo in comment "pessemistic"->"pessimistic"
2020-06-04 19:06:23 -07:00
debug_page_ref.c
…
debug_vm_pgtable.c
mm/debug: add tests validating architecture page table helpers
2020-06-04 19:06:21 -07:00
debug.c
mm, dump_page(): do not crash with invalid mapping pointer
2020-06-02 10:59:06 -07:00
dmapool.c
mm/dmapool.c: micro-optimisation remove unnecessary branch
2020-04-07 10:43:42 -07:00
early_ioremap.c
mm/early_ioremap.c: use %pa to print resource_size_t variables
2020-01-31 10:30:38 -08:00
fadvise.c
mm: return void from various readahead functions
2020-06-02 10:59:06 -07:00
failslab.c
mm/failslab.c: by default, do not fail allocations with direct reclaim only
2019-07-12 11:05:43 -07:00
filemap.c
mm/filemap: fix a typo in comment "unneccssary"->"unnecessary"
2020-06-04 19:06:24 -07:00
frame_vector.c
mm/gup: frame_vector: convert get_user_pages() --> pin_user_pages()
2020-06-08 11:05:56 -07:00
frontswap.c
mm/frontswap: fix some typos in frontswap.c
2020-06-04 19:06:24 -07:00
gup_benchmark.c
mm/gup_benchmark: support pin_user_pages() and related calls
2020-04-02 09:35:27 -07:00
gup.c
mm/gup: documentation fix for pin_user_pages*() APIs
2020-06-08 11:05:56 -07:00
highmem.c
mm, x86/mm: Untangle address space layout definitions from basic pgtable type definitions
2019-12-10 10:12:55 +01:00
hmm.c
mm/hmm: remove the customizable pfn format from hmm_range_fault
2020-05-11 10:47:29 -03:00
huge_memory.c
powerpc updates for 5.8
2020-06-05 12:39:30 -07:00
hugetlb_cgroup.c
mm: use fallthrough;
2020-04-07 10:43:41 -07:00
hugetlb.c
mm/hugetlb: fix a typos in comments
2020-06-04 19:06:23 -07:00
hwpoison-inject.c
mm/hwpoison-inject: use DEFINE_DEBUGFS_ATTRIBUTE to define debugfs fops
2019-12-01 12:59:09 -08:00
init-mm.c
mm/init-mm.c: include <linux/mman.h> for vm_committed_as_batch
2019-10-19 06:32:32 -04:00
internal.h
mm: fix a typo in comment "strucure"->"structure"
2020-06-04 19:06:24 -07:00
interval_tree.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 248
2019-06-19 17:09:08 +02:00
Kconfig
mm/memory_hotplug: disable the functionality for 32b
2020-06-04 19:06:23 -07:00
Kconfig.debug
mm: add DEBUG_WX support
2020-06-03 20:09:49 -07:00
khugepaged.c
mm: fold and remove lru_cache_add_anon() and lru_cache_add_file()
2020-06-03 20:09:48 -07:00
kmemleak-test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 333
2019-06-05 17:37:06 +02:00
kmemleak.c
mm/kmemleak.c: use address-of operator on section symbols
2020-04-02 09:35:26 -07:00
ksm.c
mm: ksm: fix a typo in comment "alreaady"->"already"
2020-06-04 19:06:23 -07:00
list_lru.c
mm/list_lru: fix a typo in comment "numbesr"->"numbers"
2020-06-04 19:06:24 -07:00
maccess.c
uaccess: Add strict non-pagefault kernel-space read function
2019-11-02 12:39:12 -07:00
madvise.c
mm: check that mm is still valid in madvise()
2020-04-24 13:28:03 -07:00
Makefile
mm/debug: add tests validating architecture page table helpers
2020-06-04 19:06:21 -07:00
mapping_dirty_helpers.c
mm/mapping_dirty_helpers: update huge page-table entry callbacks
2020-04-02 09:35:29 -07:00
memblock.c
mm/memblock: fix a typo in comment "implict"->"implicit"
2020-06-04 19:06:23 -07:00
memcontrol.c
mm, memcg: fix some typos in memcontrol.c
2020-06-04 19:06:24 -07:00
memfd.c
mm: page cache: store only head pages in i_pages
2019-09-24 15:54:08 -07:00
memory_hotplug.c
mm/memory_hotplug: fix a typo in comment "recoreded"->"recorded"
2020-06-04 19:06:23 -07:00
memory-failure.c
ACPI updates for 5.8-rc1
2020-06-02 13:25:52 -07:00
memory.c
mm/memory: fix a typo in comment "attampt"->"attempt"
2020-06-04 19:06:24 -07:00
mempolicy.c
mm, mempolicy: fix up gup usage in lookup_node
2020-06-03 20:09:49 -07:00
mempool.c
docs/core-api/mm: fix return value descriptions in mm/
2019-03-05 21:07:20 -08:00
memremap.c
mm/memremap: set caching mode for PCI P2PDMA memory to WC
2020-04-10 15:36:21 -07:00
memtest.c
…
migrate.c
mm: memcontrol: delete unused lrucare handling
2020-06-03 20:09:48 -07:00
mincore.c
mm: pagewalk: add 'depth' parameter to pte_hole
2020-02-04 03:05:25 +00:00
mlock.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
mm_init.c
mm/mm_init.c: report kasan-tag information stored in page->flags
2020-06-02 10:59:12 -07:00
mmap.c
mm: mmap: fix a typo in comment "compatbility"->"compatibility"
2020-06-04 19:06:23 -07:00
mmu_context.c
…
mmu_gather.c
asm-generic/tlb: provide MMU_GATHER_TABLE_FREE
2020-02-04 03:05:26 +00:00
mmu_notifier.c
mm/mmu_notifier: silence PROVE_RCU_LIST warnings
2020-03-21 18:56:06 -07:00
mmzone.c
…
mprotect.c
mm/vma: introduce VM_ACCESS_FLAGS
2020-04-10 15:36:21 -07:00
mremap.c
Merge branch 'akpm' (patches from Andrew)
2020-06-04 19:18:29 -07:00
msync.c
mm: untag user pointers passed to memory syscalls
2019-09-25 17:51:41 -07:00
nommu.c
mm: remove vmalloc_sync_(un)mappings()
2020-06-02 10:59:12 -07:00
oom_kill.c
mm/page_alloc: integrate classzone_idx and high_zoneidx
2020-06-03 20:09:44 -07:00
page_alloc.c
kernel/sysctl: support handling command line aliases
2020-06-08 11:05:56 -07:00
page_counter.c
mm, memcg: prevent memory.min load/store tearing
2020-04-02 09:35:29 -07:00
page_ext.c
mm/page_ext.c: drop pfn_present() check when onlining
2020-04-07 10:43:40 -07:00
page_idle.c
mm/page_idle.c: skip offline pages
2020-06-08 11:05:55 -07:00
page_io.c
fs: Enable bmap() function to properly return errors
2020-02-03 08:05:37 -05:00
page_isolation.c
mm: add function __putback_isolated_page
2020-04-07 10:43:38 -07:00
page_owner.c
mm: rename gfpflags_to_migratetype to gfp_migratetype for same convention
2020-06-03 20:09:45 -07:00
page_poison.c
mm/page_poison.c: fix a typo in a comment
2019-09-24 15:54:08 -07:00
page_reporting.c
mm/page_reporting: add budget limit on how many pages can be reported per pass
2020-04-07 10:43:39 -07:00
page_reporting.h
mm: introduce Reported pages
2020-04-07 10:43:38 -07:00
page_vma_mapped.c
mm/page_vma_mapped.c: explicitly compare pfn for normal, hugetlbfs and THP page
2020-01-31 10:30:38 -08:00
page-writeback.c
mm/page-writeback: fix a typo in comment "effictive"->"effective"
2020-06-04 19:06:24 -07:00
pagewalk.c
x86: mm: avoid allocating struct mm_struct on the stack
2020-02-04 03:05:25 +00:00
percpu-internal.h
percpu: convert chunk hints to be based on pcpu_block_md
2019-03-13 12:25:31 -07:00
percpu-km.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu-stats.c
percpu: update copyright emails to dennis@kernel.org
2020-04-01 10:09:12 -07:00
percpu-vm.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428
2019-06-05 17:37:16 +02:00
percpu.c
mm: remove the pgprot argument to __vmalloc
2020-06-02 10:59:11 -07:00
pgtable-generic.c
mm/thp: rename pmd_mknotpresent() as pmd_mkinvalid()
2020-06-03 20:09:49 -07:00
process_vm_access.c
mm: docs: Fix a comment in process_vm_rw_core
2020-03-25 10:04:01 -05:00
ptdump.c
x86: mm: ptdump: calculate effective permissions correctly
2020-06-02 10:59:09 -07:00
readahead.c
mm: use memalloc_nofs_save in readahead path
2020-06-02 10:59:07 -07:00
rmap.c
mm: memcontrol: switch to native NR_ANON_THPS counter
2020-06-03 20:09:47 -07:00
rodata_test.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441
2019-06-05 17:37:17 +02:00
shmem.c
mm: fold and remove lru_cache_add_anon() and lru_cache_add_file()
2020-06-03 20:09:48 -07:00
shuffle.c
mm: adjust shuffle code to allow for future coalescing
2020-04-07 10:43:38 -07:00
shuffle.h
mm: adjust shuffle code to allow for future coalescing
2020-04-07 10:43:38 -07:00
slab_common.c
usercopy: mark dma-kmalloc caches as usercopy caches
2020-06-02 10:59:06 -07:00
slab.c
mm/page_alloc: integrate classzone_idx and high_zoneidx
2020-06-03 20:09:44 -07:00
slab.h
mm: kmem: rename (__)memcg_kmem_(un)charge_memcg() to __memcg_kmem_(un)charge()
2020-04-02 09:35:28 -07:00
slob.c
mm/sl[uo]b: export __kmalloc_track(_node)_caller
2020-03-26 14:45:51 +01:00
slub.c
mm/slub: fix a typo in comment "disambiguiation"->"disambiguation"
2020-06-04 19:06:24 -07:00
sparse-vmemmap.c
mm/sparsemem: convert kmalloc_section_memmap() to populate_section_memmap()
2019-07-18 17:08:07 -07:00
sparse.c
mm/sparse: fix a typo in comment "convienence"->"convenience"
2020-06-04 19:06:24 -07:00
swap_cgroup.c
mm: memcontrol: make swap tracking an integral part of memory control
2020-06-03 20:09:48 -07:00
swap_slots.c
mm/swap_slots.c: assign|reset cache slot by value directly
2020-04-02 09:35:27 -07:00
swap_state.c
mm: vmscan: reclaim writepage is IO cost
2020-06-03 20:09:49 -07:00
swap.c
mm: swap: memcg: fix memcg stats for huge pages
2020-06-03 20:09:49 -07:00
swapfile.c
mm: memcontrol: charge swapin pages on instantiation
2020-06-03 20:09:48 -07:00
truncate.c
mm/thp: allow dropping THP from page cache
2019-10-19 06:32:33 -04:00
usercopy.c
usercopy: Avoid HIGHMEM pfn warning
2019-09-17 15:20:17 -07:00
userfaultfd.c
mm: memcontrol: delete unused lrucare handling
2020-06-03 20:09:48 -07:00
util.c
mm: add kvfree_sensitive() for freeing sensitive data objects
2020-06-04 19:06:22 -07:00
vmacache.c
mm: get rid of vmacache_flush_all() entirely
2018-09-13 15:18:04 -10:00
vmalloc.c
mm/vmalloc: fix a typo in comment
2020-06-04 19:06:21 -07:00
vmpressure.c
mm: vmpressure: use mem_cgroup_is_root API
2020-04-02 09:35:31 -07:00
vmscan.c
mm/vmsan: fix some typos in comment
2020-06-04 19:06:23 -07:00
vmstat.c
mm/vmstat.c: convert to use DEFINE_SEQ_ATTRIBUTE macro
2020-06-04 19:06:26 -07:00
workingset.c
mm: vmscan: reclaim writepage is IO cost
2020-06-03 20:09:49 -07:00
z3fold.c
mm/z3fold: silence kmemleak false positives of slots
2020-05-28 11:35:40 -07:00
zbud.c
mm: use false for bool variable
2020-06-04 19:06:24 -07:00
zpool.c
zpool: add malloc_support_movable to zpool_driver
2019-09-24 15:54:12 -07:00
zsmalloc.c
mm: remove map_vm_range
2020-06-02 10:59:11 -07:00
zswap.c
mm/zswap: allow setting default status, compressor and allocator in Kconfig
2020-04-07 10:43:41 -07:00