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Michael S. Tsirkin 09e35a4a1c mm/gup_benchmark: handle gup failures 
Patch series "mm/get_user_pages_fast fixes, cleanups", v2.

Turns out get_user_pages_fast and __get_user_pages_fast return different
values on error when given a single page: __get_user_pages_fast returns
0.  get_user_pages_fast returns either 0 or an error.

Callers of get_user_pages_fast expect an error so fix it up to return an
error consistently.

Stress the difference between get_user_pages_fast and
__get_user_pages_fast to make sure callers aren't confused.

This patch (of 3):

__gup_benchmark_ioctl does not handle the case where get_user_pages_fast
fails:

 - a negative return code will cause a buffer overrun

 - returning with partial success will cause use of uninitialized
   memory.

[akpm@linux-foundation.org: simplification]
Link: http://lkml.kernel.org/r/1522962072-182137-3-git-send-email-mst@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Huang Ying <ying.huang@intel.com>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Thorsten Leemhuis <regressions@leemhuis.info>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2018-04-13 17:10:27 -07:00
..
kasan
slab, slub: skip unnecessary kasan_cache_shutdown()
2018-04-05 21:36:24 -07:00
backing-dev.c
mm/vmscan: don't mess with pgdat->flags in memcg reclaim
2018-04-11 10:28:30 -07:00
balloon_compaction.c
virtio_balloon: fix deadlock on OOM
2017-11-14 23:57:38 +02:00
bootmem.c
mm: docs: fix parameter names mismatch
2018-02-06 18:32:48 -08:00
cleancache.c
fs: switch ->s_uuid to uuid_t
2017-06-05 16:59:12 +02:00
cma_debug.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
cma.c
mm/cma: manage the memory of the CMA area by using the ZONE_MOVABLE
2018-04-11 10:28:32 -07:00
cma.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
compaction.c
mm/cma: remove ALLOC_CMA
2018-04-11 10:28:32 -07:00
debug_page_ref.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
debug.c
mm/debug.c: provide useful debugging information for VM_BUG
2018-01-04 16:45:09 -08:00
dmapool.c
lib/vsprintf.c: remove %Z support
2017-02-27 18:43:47 -08:00
early_ioremap.c
mm/early_ioremap: Fix boot hang with earlyprintk=efi,keep
2017-12-11 14:54:44 +01:00
fadvise.c
mm: add ksys_fadvise64_64() helper; remove in-kernel call to sys_fadvise64_64()
2018-04-02 20:16:10 +02:00
failslab.c
mm: make should_failslab always available for fault injection
2018-04-05 21:36:26 -07:00
filemap.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
frame_vector.c
mm/frame_vector.c: release a semaphore in 'get_vaddr_frames()'
2017-12-14 16:00:48 -08:00
frontswap.c
mm, frontswap: convert frontswap_enabled to static key
2016-07-26 16:19:19 -07:00
gup_benchmark.c
mm/gup_benchmark: handle gup failures
2018-04-13 17:10:27 -07:00
gup.c
mm/gup.c: fix coding style issues.
2018-04-05 21:36:26 -07:00
highmem.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
hmm.c
mm/hmm.c: remove superfluous RCU protection around radix tree lookup
2018-04-11 10:28:31 -07:00
huge_memory.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
hugetlb_cgroup.c
mm, hugetlb_cgroup: round limit_in_bytes down to hugepage size
2016-05-20 17:58:30 -07:00
hugetlb.c
mm, hugetlbfs: introduce ->pagesize() to vm_operations_struct
2018-04-05 21:36:26 -07:00
hwpoison-inject.c
mm/memory_failure: Remove unused trapno from memory_failure
2018-01-23 12:17:42 -06:00
init-mm.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
internal.h
mm/cma: remove ALLOC_CMA
2018-04-11 10:28:32 -07:00
interval_tree.c
mm/interval_tree.c: use vma_pages() helper
2018-01-31 17:18:37 -08:00
Kconfig
treewide: simplify Kconfig dependencies for removed archs
2018-03-26 15:55:57 +02:00
Kconfig.debug
kmemcheck: rip it out
2017-11-15 18:21:05 -08:00
khugepaged.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
kmemleak-test.c
…
kmemleak.c
mm: kernel-doc: add missing parameter descriptions
2018-04-05 21:36:27 -07:00
ksm.c
mm/ksm.c: fix inconsistent accounting of zero pages
2018-04-11 10:28:31 -07:00
list_lru.c
mm: make counting of list_lru_one::nr_items lockless
2018-04-05 21:36:27 -07:00
maccess.c
mm: docs: fix parameter names mismatch
2018-02-06 18:32:48 -08:00
madvise.c
mm/memory_failure: Remove unused trapno from memory_failure
2018-01-23 12:17:42 -06:00
Makefile
mm/swap_slots.c: use conditional compilation
2018-04-05 21:36:24 -07:00
memblock.c
powerpc updates for 4.17
2018-04-07 12:08:19 -07:00
memcontrol.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
memory_hotplug.c
mm: unclutter THP migration
2018-04-11 10:28:32 -07:00
memory-failure.c
mm, migrate: remove reason argument from new_page_t
2018-04-11 10:28:32 -07:00
memory.c
mm: swap: unify cluster-based and vma-based swap readahead
2018-04-05 21:36:25 -07:00
mempolicy.c
mm: unclutter THP migration
2018-04-11 10:28:32 -07:00
mempool.c
kasan: detect invalid frees for large mempool objects
2018-02-06 18:32:43 -08:00
memtest.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
migrate.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
mincore.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mlock.c
mm, mlock, vmscan: no more skipping pagevecs
2018-02-21 15:35:42 -08:00
mm_init.c
…
mmap.c
mm: introduce MAP_FIXED_NOREPLACE
2018-04-11 10:28:38 -07:00
mmu_context.c
sched/headers: Prepare to move the task_lock()/unlock() APIs to <linux/sched/task.h>
2017-03-02 08:42:38 +01:00
mmu_notifier.c
mm, mmu_notifier: annotate mmu notifiers with blockable invalidate callbacks
2018-01-31 17:18:38 -08:00
mmzone.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
mprotect.c
sched/numa: avoid trapping faults and attempting migration of file-backed dirty pages
2018-04-11 10:28:31 -07:00
mremap.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
msync.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nobootmem.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
nommu.c
mm/nommu: remove description of alloc_vm_area
2018-04-05 21:36:26 -07:00
oom_kill.c
mm,oom_reaper: check for MMF_OOM_SKIP before complaining
2018-04-05 21:36:27 -07:00
page_alloc.c
xen, mm: allow deferred page initialization for xen pv domains
2018-04-11 10:28:38 -07:00
page_counter.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
page_ext.c
mm/page_ext.c: make page_ext_init a noop when CONFIG_PAGE_EXTENSION but nothing uses it
2018-01-31 17:18:39 -08:00
page_idle.c
mm: thp: fix potential clearing to referenced flag in page_idle_clear_pte_refs_one()
2018-04-05 21:36:25 -07:00
page_io.c
block: convert to bio_first_bvec_all & bio_first_page_all
2018-01-06 09:18:00 -07:00
page_isolation.c
mm, migrate: remove reason argument from new_page_t
2018-04-11 10:28:32 -07:00
page_owner.c
mm/page_owner.c: make early_page_owner_param() __init
2018-04-05 21:36:26 -07:00
page_poison.c
mm/page_poison.c: make early_page_poison_param() __init
2018-04-05 21:36:26 -07:00
page_vma_mapped.c
mm, page_vma_mapped: Introduce pfn_in_hpage()
2018-01-22 12:15:57 -08:00
page-writeback.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
pagewalk.c
mm: kernel-doc: add missing parameter descriptions
2018-04-05 21:36:27 -07:00
percpu-internal.h
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
percpu-km.c
percpu: allow select gfp to be passed to underlying allocators
2018-02-18 05:33:01 -08:00
percpu-stats.c
mm: reuse DEFINE_SHOW_ATTRIBUTE() macro
2018-04-05 21:36:25 -07:00
percpu-vm.c
percpu: allow select gfp to be passed to underlying allocators
2018-02-18 05:33:01 -08:00
percpu.c
arch: remove obsolete architecture ports
2018-04-02 20:20:12 -07:00
pgtable-generic.c
mm: do not lose dirty and accessed bits in pmdp_invalidate()
2018-01-31 17:18:38 -08:00
process_vm_access.c
mm: docs: add blank lines to silence sphinx "Unexpected indentation" errors
2018-02-06 18:32:48 -08:00
quicklist.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
readahead.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
rmap.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
rodata_test.c
mm: fix RODATA_TEST failure "rodata_test: test data was not read only"
2017-10-03 17:54:24 -07:00
shmem.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
slab_common.c
mm: make should_failslab always available for fault injection
2018-04-05 21:36:26 -07:00
slab.c
slab, slub: skip unnecessary kasan_cache_shutdown()
2018-04-05 21:36:24 -07:00
slab.h
slab, slub: skip unnecessary kasan_cache_shutdown()
2018-04-05 21:36:24 -07:00
slob.c
slab, slub, slob: add slab_flags_t
2017-11-15 18:21:01 -08:00
slub.c
kasan, slub: fix handling of kasan_slab_free hook
2018-04-11 10:28:32 -07:00
sparse-vmemmap.c
mm: merge vmem_altmap_alloc into altmap_alloc_block_buf
2018-01-08 11:46:23 -08:00
sparse.c
mm/memory_hotplug: optimize memory hotplug
2018-04-05 21:36:25 -07:00
swap_cgroup.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
swap_slots.c
mm/swap_slots.c: use conditional compilation
2018-04-05 21:36:24 -07:00
swap_state.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
swap.c
mm/swap.c: remove @cold parameter description for release_pages()
2018-04-05 21:36:26 -07:00
swapfile.c
mm/swapfile.c: make pointer swap_avail_heads static
2018-04-11 10:28:32 -07:00
truncate.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
usercopy.c
usercopy: WARN() on slab cache usercopy region violations
2018-01-15 12:07:48 -08:00
userfaultfd.c
mm/userfaultfd.c: remove duplicate include
2018-02-06 18:32:47 -08:00
util.c
exec: pass stack rlimit into mm layout functions
2018-04-11 10:28:37 -07:00
vmacache.c
License cleanup: add SPDX GPL-2.0 license identifier to files with no license
2017-11-02 11:10:55 +01:00
vmalloc.c
vmalloc: fix __GFP_HIGHMEM usage for vmalloc_32 on 32b systems
2018-02-21 15:35:43 -08:00
vmpressure.c
mm, vmpressure: pass-through notification support
2017-07-10 16:32:31 -07:00
vmscan.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
vmstat.c
mm: introduce NR_INDIRECTLY_RECLAIMABLE_BYTES
2018-04-11 10:28:29 -07:00
workingset.c
page cache: use xa_lock
2018-04-11 10:28:39 -07:00
z3fold.c
mm/z3fold.c: use gfpflags_allow_blocking
2018-04-11 10:28:31 -07:00
zbud.c
mm: docs: fix parameter names mismatch
2018-02-06 18:32:48 -08:00
zpool.c
mm/zpool.c: zpool_evictable: fix mismatch in parameter name and kernel-doc
2018-02-21 15:35:43 -08:00
zsmalloc.c
mm: kernel-doc: add missing parameter descriptions
2018-04-05 21:36:27 -07:00
zswap.c
mm, swap, frontswap: fix THP swap if frontswap enabled
2018-02-21 15:35:43 -08:00