Linus Torvalds 00a3d660cb Revert "fs: do not prefault sys_write() user buffer pages" ... This reverts commit 998ef75ddb. The commit itself does not appear to be buggy per se, but it is exposing a bug in ext4 (and Ted thinks ext3 too, but we solved that by getting rid of it). It's too late in the release cycle to really worry about this, even if Dave Hansen has a patch that may actually fix the underlying ext4 problem. We can (and should) revisit this for the next release. The problem is that moving the prefaulting later now exposes a special case with partially successful writes that isn't handled correctly. And the prefaulting likely isn't normally even that much of a performance issue - it looks like at least one reason Dave saw this in his performance tests is that he also ran them on Skylake that now supports the new SMAP code, which makes the normally very cheap user space prefaulting noticeably more expensive. Bisected-and-acked-by: Ted Ts'o <tytso@mit.edu> Analyzed-and-acked-by: Dave Hansen <dave.hansen@linux.intel.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		2015-10-07 08:32:38 +01:00
..
kasan	kasan: fix last shadow judgement in memory_is_poisoned_16()	2015-09-17 21:16:07 -07:00
backing-dev.c
balloon_compaction.c
bootmem.c
cleancache.c
cma_debug.c
cma.c
cma.h
compaction.c
debug-pagealloc.c
debug.c
dmapool.c	dmapool: fix overflow condition in pool_find_page()	2015-10-01 21:42:35 -04:00
early_ioremap.c
fadvise.c
failslab.c
filemap.c	Revert "fs: do not prefault sys_write() user buffer pages"	2015-10-07 08:32:38 +01:00
frame_vector.c
frontswap.c
gup.c
highmem.c
huge_memory.c
hugetlb_cgroup.c
hugetlb.c	mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault	2015-10-01 21:42:35 -04:00
hwpoison-inject.c
init-mm.c
internal.h
interval_tree.c
Kconfig	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
Kconfig.debug
kmemcheck.c
kmemleak-test.c
kmemleak.c
ksm.c
list_lru.c
maccess.c
madvise.c
Makefile	media updates for v4.3-rc1	2015-09-11 16:42:39 -07:00
memblock.c
memcontrol.c	memcg: remove pcp_counter_lock	2015-10-01 21:42:35 -04:00
memory_hotplug.c
memory-failure.c
memory.c
mempolicy.c
mempool.c
memtest.c
migrate.c	memcg: fix dirty page migration	2015-10-01 21:42:35 -04:00
mincore.c
mlock.c
mm_init.c
mmap.c	mm, dax: VMA with vm_ops->pfn_mkwrite wants to be write-notified	2015-09-22 15:09:53 -07:00
mmu_context.c
mmu_notifier.c
mmzone.c
mprotect.c
mremap.c
msync.c
nobootmem.c
nommu.c
oom_kill.c
page_alloc.c
page_counter.c
page_ext.c
page_idle.c
page_io.c
page_isolation.c
page_owner.c
page-writeback.c
pagewalk.c
percpu-km.c
percpu-vm.c
percpu.c
pgtable-generic.c
process_vm_access.c
quicklist.c
readahead.c
rmap.c
shmem.c
slab_common.c
slab.c	mm/slab: fix unexpected index mapping result of kmalloc_size(INDEX_NODE+1)	2015-10-01 21:42:35 -04:00
slab.h
slob.c
slub.c
sparse-vmemmap.c
sparse.c
swap_cgroup.c
swap_state.c
swap.c
swapfile.c
truncate.c
userfaultfd.c
util.c
vmacache.c
vmalloc.c
vmpressure.c
vmscan.c	vmscan: fix sane_reclaim helper for legacy memcg	2015-09-22 15:09:53 -07:00
vmstat.c
workingset.c
zbud.c
zpool.c
zsmalloc.c
zswap.c