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Wanpeng Li 6518e4a0e7 mm/memory-hotplug: fix lowmem count overflow when offline pages 
commit cea27eb2a202959783f81254c48c250ddd80e129 upstream.

The logic for the memory-remove code fails to correctly account the
Total High Memory when a memory block which contains High Memory is
offlined as shown in the example below.  The following patch fixes it.

Before logic memory remove:

MemTotal:        7603740 kB
MemFree:         6329612 kB
Buffers:           94352 kB
Cached:           872008 kB
SwapCached:            0 kB
Active:           626932 kB
Inactive:         519216 kB
Active(anon):     180776 kB
Inactive(anon):   222944 kB
Active(file):     446156 kB
Inactive(file):   296272 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:       7294672 kB
HighFree:        5704696 kB
LowTotal:         309068 kB
LowFree:          624916 kB

After logic memory remove:

MemTotal:        7079452 kB
MemFree:         5805976 kB
Buffers:           94372 kB
Cached:           872000 kB
SwapCached:            0 kB
Active:           626936 kB
Inactive:         519236 kB
Active(anon):     180780 kB
Inactive(anon):   222944 kB
Active(file):     446156 kB
Inactive(file):   296292 kB
Unevictable:           0 kB
Mlocked:               0 kB
HighTotal:       7294672 kB
HighFree:        5181024 kB
LowTotal:       4294752076 kB
LowFree:          624952 kB

[mhocko@suse.cz: fix CONFIG_HIGHMEM=n build]
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2013-07-20 17:16:09 -07:00
..
backing-dev.c
bdi: allow block devices to say that they require stable page writes
2013-02-21 17:22:19 -08:00
balloon_compaction.c
mm: introduce a common interface for balloon pages mobility
2012-12-11 17:22:26 -08:00
bootmem.c
mm: Add alloc_bootmem_low_pages_nopanic()
2013-01-29 19:32:59 -08:00
bounce.c
block: optionally snapshot page contents to provide stable pages during write
2013-02-21 17:22:20 -08:00
cleancache.c
fs: encode_fh: return FILEID_INVALID if invalid fid_type
2013-02-26 02:46:10 -05:00
compaction.c
mm: add & use zone_end_pfn() and zone_spans_pfn()
2013-02-23 17:50:20 -08:00
debug-pagealloc.c
mm, x86: Remove debug_pagealloc_enabled
2011-12-06 09:24:07 +01:00
dmapool.c
dmapool: make DMAPOOL_DEBUG detect corruption of free marker
2012-12-11 17:22:24 -08:00
fadvise.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
failslab.c
switch debugfs to umode_t
2012-01-03 22:54:56 -05:00
filemap_xip.c
mm: move all mmu notifier invocations to be done outside the PT lock
2012-10-09 16:22:58 +09:00
filemap.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
fremap.c
Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs"
2013-03-28 17:45:51 -07:00
frontswap.c
frontswap: support exclusive gets if tmem backend is capable
2012-09-21 10:38:12 -04:00
highmem.c
Some nice cleanups, and even a patch my wife did as a "live" demo for
2012-12-20 08:37:05 -08:00
huge_memory.c
mm/THP: use pmd_populate() to update the pmd with pgtable_t pointer
2013-06-07 12:52:42 -07:00
hugetlb_cgroup.c
mm/hugetlb: create hugetlb cgroup file in hugetlb_init
2012-12-18 15:02:15 -08:00
hugetlb.c
futex: Take hugepages into account when generating futex_key
2013-07-13 11:39:17 -07:00
hwpoison-inject.c
memcg: rename config variables
2012-07-31 18:42:43 -07:00
init-mm.c
atomic: use <linux/atomic.h>
2011-07-26 16:49:47 -07:00
internal.h
mm: accelerate munlock() treatment of THP pages
2013-02-27 19:10:09 -08:00
interval_tree.c
mm: add CONFIG_DEBUG_VM_RB build option
2012-10-09 16:22:42 +09:00
Kconfig
Select VIRT_TO_BUS directly where needed
2013-03-12 11:16:40 -07:00
Kconfig.debug
mm: more intensive memory corruption debugging
2012-01-10 16:30:42 -08:00
kmemcheck.c
kmemcheck: Fix build errors due to missing slab.h
2010-03-30 22:02:32 +09:00
kmemleak-test.c
kmemleak: remove memset by using kzalloc
2011-01-27 18:31:51 +00:00
kmemleak.c
hlist: drop the node parameter from iterators
2013-02-27 19:10:24 -08:00
ksm.c
ksm: fix m68k build: only NUMA needs pfn_to_nid
2013-03-08 15:05:34 -08:00
maccess.c
mm: Map most files to use export.h instead of module.h
2011-10-31 09:20:12 -04:00
madvise.c
mm: make madvise(MADV_WILLNEED) support swap file prefetch
2013-02-23 17:50:10 -08:00
Makefile
mm: introduce a common interface for balloon pages mobility
2012-12-11 17:22:26 -08:00
memblock.c
x86, ACPI, mm: Revert movablemem_map support
2013-03-02 09:34:39 -08:00
memcontrol.c
memcg, kmem: fix reference count handling on the error path
2013-07-20 17:16:08 -07:00
memory_hotplug.c
mm/hotplug: only free wait_table if it's allocated by vmalloc
2013-03-22 16:41:20 -07:00
memory-failure.c
HWPOISON: change order of error_states[]'s elements
2013-02-23 17:50:22 -08:00
memory.c
vm: add vm_iomap_memory() helper function
2013-04-16 16:45:45 -07:00
mempolicy.c
mm/mempolicy.c: fix sp_node_init() argument ordering
2013-03-08 15:05:34 -08:00
mempool.c
mempool: add @gfp_mask to mempool_create_node()
2012-06-25 11:53:47 +02:00
migrate.c
mm: migration: add migrate_entry_wait_huge()
2013-06-20 12:01:31 -07:00
mincore.c
swap: make each swap partition have one address_space
2013-02-23 17:50:17 -08:00
mlock.c
Revert "mm: introduce VM_POPULATE flag to better deal with racy userspace programs"
2013-03-28 17:45:51 -07:00
mm_init.c
mm: init: report on last-nid information stored in page->flags
2013-02-23 17:50:18 -08:00
mmap.c
shm: fix null pointer deref when userspace specifies invalid hugepage size
2013-05-19 11:38:21 -07:00
mmu_context.c
mm, counters: remove task argument to sync_mm_rss() and __sync_task_rss_stat()
2012-03-21 17:54:59 -07:00
mmu_notifier.c
mm: mmu_notifier: re-fix freed page still mapped in secondary MMU
2013-06-07 12:52:41 -07:00
mmzone.c
mm: rename page struct field helpers
2013-02-23 17:50:18 -08:00
mprotect.c
mm/mprotect.c: coding-style cleanups
2012-12-18 15:02:15 -08:00
mremap.c
mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write()
2013-02-23 17:50:17 -08:00
msync.c
sanitize vfs_fsync calling conventions
2010-05-21 18:31:21 -04:00
nobootmem.c
mm: Add alloc_bootmem_low_pages_nopanic()
2013-01-29 19:32:59 -08:00
nommu.c
vm: add no-mmu vm_iomap_memory() stub
2013-04-27 13:25:38 -07:00
oom_kill.c
memcg, oom: provide more precise dump info while memcg oom happening
2013-02-23 17:50:08 -08:00
page_alloc.c
mm/memory-hotplug: fix lowmem count overflow when offline pages
2013-07-20 17:16:09 -07:00
page_cgroup.c
memcontrol: use N_MEMORY instead N_HIGH_MEMORY
2012-12-12 17:38:32 -08:00
page_io.c
mm: swap: mark swap pages writeback before queueing for direct IO
2013-05-07 20:33:10 -07:00
page_isolation.c
mm: fix zone_watermark_ok_safe() accounting of isolated pages
2013-01-04 16:11:46 -08:00
page-writeback.c
2 writeback fixes
2013-02-28 13:21:44 -08:00
pagewalk.c
mm/pagewalk.c: walk_page_range should avoid VM_PFNMAP areas
2013-06-07 12:52:42 -07:00
percpu-km.c
percpu: clear memory allocated with the km allocator
2010-10-02 10:28:42 +03:00
percpu-vm.c
mm: fix kernel-doc warnings
2012-06-20 14:39:36 -07:00
percpu.c
mm, percpu: Make sure percpu_alloc early parameter has an argument
2012-12-02 06:23:04 -08:00
pgtable-generic.c
mm: Only flush the TLB when clearing an accessible pte
2012-12-11 14:28:34 +00:00
process_vm_access.c
Fix: compat_rw_copy_check_uvector() misuse in aio, readv, writev, and security keys
2013-03-12 11:05:45 -07:00
quicklist.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
readahead.c
switch simple cases of fget_light to fdget
2012-09-26 22:20:08 -04:00
rmap.c
mm/rmap: rename anon_vma_unlock() => anon_vma_unlock_write()
2013-02-23 17:50:17 -08:00
shmem.c
fix nommu breakage in shmem.c
2013-03-01 23:50:45 -05:00
slab_common.c
slab: propagate tunable values
2012-12-18 15:02:14 -08:00
slab.c
taint: add explicit flag to show whether lock dep is still OK.
2013-01-21 17:17:57 +10:30
slab.h
slab: propagate tunable values
2012-12-18 15:02:14 -08:00
slob.c
mm: rename page struct field helpers
2013-02-23 17:50:18 -08:00
slub.c
The sweeping change is to make add_taint() explicitly indicate whether to disable
2013-02-25 15:41:43 -08:00
sparse-vmemmap.c
mm: delete various needless include <linux/module.h>
2011-10-31 09:20:11 -04:00
sparse.c
memory-failure: use num_poisoned_pages instead of mce_bad_pages
2013-02-23 17:50:15 -08:00
swap_state.c
swap: avoid read_swap_cache_async() race to deadlock while waiting on discard I/O completion
2013-06-20 12:01:30 -07:00
swap.c
swap: make each swap partition have one address_space
2013-02-23 17:50:17 -08:00
swapfile.c
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2013-02-26 20:16:07 -08:00
truncate.c
mm: drop vmtruncate
2012-12-20 18:46:29 -05:00
util.c
swap: make each swap partition have one address_space
2013-02-23 17:50:17 -08:00
vmalloc.c
mm: use NUMA_NO_NODE
2013-02-23 17:50:21 -08:00
vmscan.c
mm/vmscan: fix error return in kswapd_run()
2013-04-17 16:10:45 -07:00
vmstat.c
mm: add & use zone_end_pfn() and zone_spans_pfn()
2013-02-23 17:50:20 -08:00