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Naoya Horiguchi 669c5b32b5 pagewalk: improve vma handling 
commit fafaa4264eba49fd10695c193a82760558d093f4 upstream.

Current implementation of page table walker has a fundamental problem in
vma handling, which started when we tried to handle vma(VM_HUGETLB).
Because it's done in pgd loop, considering vma boundary makes code
complicated and bug-prone.

From the users viewpoint, some user checks some vma-related condition to
determine whether the user really does page walk over the vma.

In order to solve these, this patch moves vma check outside pgd loop and
introduce a new callback ->test_walk().

Signed-off-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Pavel Emelyanov <xemul@parallels.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
[bwh: Backported to 3.16 as dependency of L1TF mitigation]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
 		2019-07-27 21:51:51 +02:00
..
kasan kasan, module, vmalloc: rework shadow allocation for modules 2015-05-04 14:03:58 -07:00
Kconfig Import T813XXS2BRC2 kernel source changes 2018-05-26 00:39:42 +02:00
Kconfig.debug
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Makefile BACKPORT: mm/zpool: implement common zpool api to zbud/zsmalloc 2016-05-18 14:35:03 +05:30
backing-dev.c
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balloon_compaction.c
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bootmem.c
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bounce.c
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cleancache.c
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compaction.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
debug-pagealloc.c mm/debug-pagealloc.c: print page physical address for 2015-08-23 23:19:22 -07:00
dmapool.c
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early_ioremap.c
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fadvise.c mm/fadvise.c: fix signed overflow UBSAN complaint 2019-07-27 21:51:37 +02:00
failslab.c
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filemap.c mm, fs: check for fatal signals in do_generic_file_read() 2019-07-27 21:43:51 +02:00
filemap_xip.c
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fremap.c
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frontswap.c
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highmem.c
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huge_memory.c mm/huge_memory.c: respect FOLL_FORCE/FOLL_COW for thp 2019-07-27 21:43:25 +02:00
hugetlb.c mm: hugetlbfs: skip shared VMAs when unmapping private pages to satisfy a fault 2015-10-22 14:37:50 -07:00
hugetlb_cgroup.c
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hwpoison-inject.c
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init-mm.c
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internal.h mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
interval_tree.c
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kmemcheck.c
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kmemleak-test.c
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kmemleak.c mm: kmemleak: allow safe memory scanning during kmemleak disabling 2015-06-22 10:47:32 +05:30
ksm.c mm,ksm: fix endless looping in allocating memory when ksm enable 2019-07-27 21:42:51 +02:00
maccess.c
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madvise.c mm/madvise.c: fix madvise() infinite loop under special circumstances 2019-07-27 21:45:21 +02:00
memblock.c
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memcontrol.c UPSTREAM: memcg: Only free spare array when readers are done 2016-05-18 14:36:06 +05:30
memory-failure.c This is the 3.10.98 stable release 2017-04-18 17:17:24 +02:00
memory.c mm/memory.c: check return value of ioremap_prot 2019-07-27 21:51:23 +02:00
memory_hotplug.c mm/memory_hotplug.c: check start_pfn in test_pages_in_a_zone() 2019-07-27 21:43:51 +02:00
mempolicy.c mm/mempolicy.c: avoid use uninitialized preferred_node 2019-07-27 21:49:27 +02:00
mempool.c
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memtest.c memtest: use phys_addr_t for physical addresses 2015-04-01 09:27:43 -07:00
migrate.c Sanitize 'move_pages()' permission checks 2019-07-27 21:44:50 +02:00
mincore.c
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mlock.c mm: reorder can_do_mlock to fix audit denial 2015-09-16 18:20:13 +05:30
mm_init.c
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mmap.c mm/mmap.c: do not blow on PROT_NONE MAP_FIXED holes in the stack 2019-07-27 21:44:55 +02:00
mmu_context.c
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mmu_notifier.c
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mmzone.c
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mprotect.c mm/mprotect: add a cond_resched() inside change_pmd_range() 2019-07-27 21:46:25 +02:00
mremap.c
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msync.c
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nobootmem.c
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nommu.c This is the 3.10.73 stable release 2015-04-24 18:14:57 -07:00
oom_kill.c This is the 3.10.67 stable release 2015-04-24 18:04:40 -07:00
page-writeback.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_alloc.c mm: fix cma accounting in zone_watermark_ok 2019-07-27 21:51:09 +02:00
page_cgroup.c
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page_io.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
page_isolation.c mm: add zone counter for cma pages 2019-07-27 21:51:09 +02:00
pageowner.c
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pagewalk.c pagewalk: improve vma handling 2019-07-27 21:51:51 +02:00
percpu-km.c
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percpu-vm.c
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percpu.c
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pgtable-generic.c
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process_reclaim.c lowmemorykiller: Introduce sysfs node for ALMK and PPR adj threshold 2016-07-06 23:07:02 -07:00
process_vm_access.c ptrace: use fsuid, fsgid, effective creds for fs access checks 2016-02-25 11:57:47 -08:00
quicklist.c
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readahead.c readahead: make context readahead more conservative 2019-07-27 21:49:54 +02:00
rmap.c mm: Enhance per process reclaim to consider shared pages 2015-04-16 10:14:27 -07:00
shmem.c tmpfs: fix regression hang in fallocate undo 2019-07-27 21:41:47 +02:00
showmem.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
slab.c cpuset: PF_SPREAD_PAGE and PF_SPREAD_SLAB should be atomic flags 2019-07-27 21:44:59 +02:00
slab.h
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slab_common.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
slob.c
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slub.c mm: slub: add kernel address sanitizer support for slub allocator 2015-05-04 14:03:56 -07:00
sparse-vmemmap.c
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sparse.c
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swap.c
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swap_state.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
swapfile.c swapfile: fix memory corruption via malformed swapfile 2019-07-27 21:42:14 +02:00
truncate.c
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util.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
vmpressure.c mm: vmpressure: fix sending wrong events on underflow 2019-07-27 21:43:56 +02:00
vmscan.c mm: fix the NULL mapping case in __isolate_lru_page() 2019-07-27 21:49:37 +02:00
vmstat.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zbud.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zpool.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zsmalloc.c Import latest Samsung release 2017-04-18 03:43:52 +02:00
zswap.c Import latest Samsung release 2017-04-18 03:43:52 +02:00