Use common can_change_mtu function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

Use common can_change_mtu function.

Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The variable err was of the type u32. It was being compared with < 0, and being
an unsigned variable the comparison would have been always false.

Moreover, err was getting the return value from set_reset_mode() and
xcan_set_bittiming(), and both are returning int.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Reviewed-by: Michal Simek <michal.simek@xilinx.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

these variable were only assigned some values, but then never
reused again.
so they are safe to be removed.

Signed-off-by: Sudip Mukherjee <sudip@vectorindia.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

It seems struct esd_usb2 dev is not deallocated on disconnect. The patch adds
the missing deallocation.

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Acked-by: Matthias Fuchs <matthias.fuchs@esd.eu>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

The CAN device drivers can use can_is_canfd_skb() to check if the frame to send
is on CAN FD mode or normal CAN mode.

Acked-by: Oliver Hartkopp <socketcan@hartkopp.net>
Signed-off-by: Dong Aisheng <b29396@freescale.com>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

This patch fixes a typo in CAN's dev.c:

    CIA -> CiA

which stands for CAN in Automation.

Signed-off-by: Roman Fietze <roman.fietze@telemotive.de>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

ikfree_skb() is Called in can_free_echo_skb(), which might be called from (TX
Error) interrupt, which triggers the folloing warning:

[ 1153.360705] ------------[ cut here ]------------
[ 1153.360715] WARNING: CPU: 0 PID: 31 at net/core/skbuff.c:563 skb_release_head_state+0xb9/0xd0()
[ 1153.360772] Call Trace:
[ 1153.360778]  [<c167906f>] dump_stack+0x41/0x52
[ 1153.360782]  [<c105bb7e>] warn_slowpath_common+0x7e/0xa0
[ 1153.360784]  [<c158b909>] ? skb_release_head_state+0xb9/0xd0
[ 1153.360786]  [<c158b909>] ? skb_release_head_state+0xb9/0xd0
[ 1153.360788]  [<c105bc42>] warn_slowpath_null+0x22/0x30
[ 1153.360791]  [<c158b909>] skb_release_head_state+0xb9/0xd0
[ 1153.360793]  [<c158be90>] skb_release_all+0x10/0x30
[ 1153.360795]  [<c158bf06>] kfree_skb+0x36/0x80
[ 1153.360799]  [<f8486938>] ? can_free_echo_skb+0x28/0x40 [can_dev]
[ 1153.360802]  [<f8486938>] can_free_echo_skb+0x28/0x40 [can_dev]
[ 1153.360805]  [<f849a12c>] esd_pci402_interrupt+0x34c/0x57a [esd402]
[ 1153.360809]  [<c10a75b5>] handle_irq_event_percpu+0x35/0x180
[ 1153.360811]  [<c10a7623>] ? handle_irq_event_percpu+0xa3/0x180
[ 1153.360813]  [<c10a7731>] handle_irq_event+0x31/0x50
[ 1153.360816]  [<c10a9c7f>] handle_fasteoi_irq+0x6f/0x120
[ 1153.360818]  [<c10a9c10>] ? handle_edge_irq+0x110/0x110
[ 1153.360822]  [<c1011b61>] handle_irq+0x71/0x90
[ 1153.360823]  <IRQ>  [<c168152c>] do_IRQ+0x3c/0xd0
[ 1153.360829]  [<c1680b6c>] common_interrupt+0x2c/0x34
[ 1153.360834]  [<c107d277>] ? finish_task_switch+0x47/0xf0
[ 1153.360836]  [<c167c27b>] __schedule+0x35b/0x7e0
[ 1153.360839]  [<c10a5334>] ? console_unlock+0x2c4/0x4d0
[ 1153.360842]  [<c13df500>] ? n_tty_receive_buf_common+0x890/0x890
[ 1153.360845]  [<c10707b6>] ? process_one_work+0x196/0x370
[ 1153.360847]  [<c167c723>] schedule+0x23/0x60
[ 1153.360849]  [<c1070de1>] worker_thread+0x161/0x460
[ 1153.360852]  [<c1090fcf>] ? __wake_up_locked+0x1f/0x30
[ 1153.360854]  [<c1070c80>] ? rescuer_thread+0x2f0/0x2f0
[ 1153.360856]  [<c1074f01>] kthread+0xa1/0xc0
[ 1153.360859]  [<c1680401>] ret_from_kernel_thread+0x21/0x30
[ 1153.360861]  [<c1074e60>] ? kthread_create_on_node+0x110/0x110
[ 1153.360863] ---[ end trace 5ff83639cbb74b35 ]---

This patch replaces the kfree_skb() by dev_kfree_skb_any().

Signed-off-by: Thomas Körper <thomas.koerper@esd.eu>
Cc: linux-stable <stable@vger.kernel.org>
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>

It has been reported that generating an MLD listener report on
devices with large MTUs (e.g. 9000) and a high number of IPv6
addresses can trigger a skb_over_panic():

skbuff: skb_over_panic: text:ffffffff80612a5d len:3776 put:20
head:ffff88046d751000 data:ffff88046d751010 tail:0xed0 end:0xec0
dev:port1
 ------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:100!
invalid opcode: 0000 [#1] SMP
Modules linked in: ixgbe(O)
CPU: 3 PID: 0 Comm: swapper/3 Tainted: G O 3.14.23+ #4
[...]
Call Trace:
 <IRQ>
 [<ffffffff80578226>] ? skb_put+0x3a/0x3b
 [<ffffffff80612a5d>] ? add_grhead+0x45/0x8e
 [<ffffffff80612e3a>] ? add_grec+0x394/0x3d4
 [<ffffffff80613222>] ? mld_ifc_timer_expire+0x195/0x20d
 [<ffffffff8061308d>] ? mld_dad_timer_expire+0x45/0x45
 [<ffffffff80255b5d>] ? call_timer_fn.isra.29+0x12/0x68
 [<ffffffff80255d16>] ? run_timer_softirq+0x163/0x182
 [<ffffffff80250e6f>] ? __do_softirq+0xe0/0x21d
 [<ffffffff8025112b>] ? irq_exit+0x4e/0xd3
 [<ffffffff802214bb>] ? smp_apic_timer_interrupt+0x3b/0x46
 [<ffffffff8063f10a>] ? apic_timer_interrupt+0x6a/0x70

mld_newpack() skb allocations are usually requested with dev->mtu
in size, since commit 72e09ad1 ("ipv6: avoid high order allocations")
we have changed the limit in order to be less likely to fail.

However, in MLD/IGMP code, we have some rather ugly AVAILABLE(skb)
macros, which determine if we may end up doing an skb_put() for
adding another record. To avoid possible fragmentation, we check
the skb's tailroom as skb->dev->mtu - skb->len, which is a wrong
assumption as the actual max allocation size can be much smaller.

The IGMP case doesn't have this issue as commit 57e1ab6e


("igmp: refine skb allocations") stores the allocation size in
the cb[].

Set a reserved_tailroom to make it fit into the MTU and use
skb_availroom() helper instead. This also allows to get rid of
igmp_skb_size().

Reported-by: Wei Liu <lw1a2.jing@gmail.com>
Fixes: 72e09ad1

 ("ipv6: avoid high order allocations")
Signed-off-by: Daniel Borkmann <dborkman@redhat.com>
Cc: Eric Dumazet <edumazet@google.com>
Cc: Hannes Frederic Sowa <hannes@stressinduktion.org>
Cc: David L Stevens <david.stevens@oracle.com>
Acked-by: Eric Dumazet <edumazet@google.com>
Acked-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Added the USB VID/PID for the HP lt4112 LTE/HSPA+ Gobi 4G Modem (Huawei me906e)

Signed-off-by: Martin Hauke <mardnh@gmx.de>
Acked-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pravin B Shelar says:

====================
Open vSwitch

Following fixes are accumulated in ovs-repo.
Three of them are related to protocol processing, one is
related to memory leak in case of error and one is to
fix race.
Patch "Validate IPv6 flow key and mask values" has conflicts
with net-next, Let me know if you want me to send the patch
for net-next.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Solves possible lockup issues that can be seen from firmware DCB agents calling
into the DCB app api.

DCB firmware event queues can be tied in with NAPI so that dcb events are
generated in softIRQ context. This can results in calls to dcb_*app()
functions which try to take the dcb_lock.

If the the event triggers while we also have the dcb_lock because lldpad or
some other agent happened to be issuing a  get/set command we could see a cpu
lockup.

This code was not originally written with firmware agents in mind, hence
grabbing dcb_lock from softIRQ context was not considered.

Signed-off-by: Anish Bhatt <anish@chelsio.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

In case of any failure ieee802154fake_probe() just calls unregister_netdev().
But it does not look safe to unregister netdevice before it was registered.

The patch implements straightforward resource deallocation in case of
failure in ieee802154fake_probe().

Found by Linux Driver Verification project (linuxtesting.org).

Signed-off-by: Alexey Khoroshilov <khoroshilov@ispras.ru>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pablo Neira Ayuso says:

====================
Netfilter/IPVS fixes for net

The following patchset contains Netfilter updates for your net tree,
they are:

1) Fix missing initialization of the range structure (allocated in the
   stack) in nft_masq_{ipv4, ipv6}_eval, from Daniel Borkmann.

2) Make sure the data we receive from userspace contains the req_version
   structure, otherwise return an error incomplete on truncated input.
   From Dan Carpenter.

3) Fix handling og skb->sk which may cause incorrect handling
   of connections from a local process. Via Simon Horman, patch from
   Calvin Owens.

4) Fix wrong netns in nft_compat when setting target and match params
   structure.

5) Relax chain type validation in nft_compat that was recently included,
   this broke the matches that need to be run from the route chain type.
   Now iptables-test.py automated regression tests report success again
   and we avoid the only possible problematic case, which is the use of
   nat targets out of nat chain type.

6) Use match->table to validate the tablename, instead of the match->name.
   Again patch for nft_compat.

7) Restore the synchronous release of objects from the commit and abort
   path in nf_tables. This is causing two major problems: splats when using
   nft_compat, given that matches and targets may sleep and call_rcu is
   invoked from softirq context. Moreover Patrick reported possible event
   notification reordering when rules refer to anonymous sets.

8) Fix race condition in between packets that are being confirmed by
   conntrack and the ctnetlink flush operation. This happens since the
   removal of the central spinlock. Thanks to Jesper D. Brouer to looking
   into this.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

The TX_IN_SEL offset for the CPSW_PORT/TX_IN_CTL register was
incorrect. This caused the Dual MAC mode to never get set when
it should. It also caused possible unintentional setting of a
bit in the CPSW_PORT/TX_BLKS_REM register.

The purpose of setting the Dual MAC mode for this register is to:

    "... allow packets from both ethernet ports to be written into
     the FIFO without one port starving the other port."
					- AM335x ARM TRM

Signed-off-by: John Ogness <john.ogness@linutronix.de>
Reviewed-by: Mugunthan V N <mugunthanvnm@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Otherwise the exported symbols might be discarded because of no users
in vmlinux.

Reported-by: Jim Davis <jim.epost@gmail.com>
Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
Signed-off-by: David S. Miller <davem@davemloft.net>

Trying to add an unreachable route incorrectly returns -ESRCH if
if custom FIB rules are present:

[root@localhost ~]# ip route add 74.125.31.199 dev eth0 via 1.2.3.4
RTNETLINK answers: Network is unreachable
[root@localhost ~]# ip rule add to 55.66.77.88 table 200
[root@localhost ~]# ip route add 74.125.31.199 dev eth0 via 1.2.3.4
RTNETLINK answers: No such process
[root@localhost ~]#

Commit 83886b6b ("[NET]: Change "not found"
return value for rule lookup") changed fib_rules_lookup()
to use -ESRCH as a "not found" code internally, but for user space it
should be translated into -ENETUNREACH. Handle the translation centrally in
ipv4-specific fib_lookup(), leaving the DECnet case alone.

On a related note, commit b7a71b51
("ipv4: removed redundant conditional") removed a similar translation from
ip_route_input_slow() prematurely AIUI.

Fixes: b7a71b51

 ("ipv4: removed redundant conditional")
Signed-off-by: Panu Matilainen <pmatilai@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Reject flow label key and mask values with invalid bits set.
Introduced by commit 3fdbd1ce

 ("openvswitch: add ipv6 'set'
action").

Signed-off-by: Jarno Rajahalme <jrajahalme@nicira.com>
Acked-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

dp read operations depends on ovs_dp_cmd_fill_info(). This API
needs to looup vport to find dp name, but vport lookup can
fail. Therefore to keep vport reference alive we need to
take ovs lock.

Introduced by commit 6093ae9a

 ("openvswitch: Minimize
dp and vport critical sections").

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>
Acked-by: Andy Zhou <azhou@nicira.com>

match_validate() enforce that a mask matching on NDP attributes has also an
exact match on ICMPv6 type.
The ICMPv6 type, which is 8-bit wide, is stored in the 'tp.src' field of
'struct sw_flow_key', which is 16-bit wide.
Therefore, an exact match on ICMPv6 type should only check the first 8 bits.

This commit fixes a bug that prevented flows with an exact match on NDP field
from being installed
Introduced by commit 03f0d916

 ("openvswitch: Mega flow implementation").

Signed-off-by: Daniele Di Proietto <ddiproietto@vmware.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

The checksum of ICMPv6 packets uses the IP pseudoheader as part of
the calculation, unlike ICMP in IPv4. This was not implemented,
which means that modifying the IP addresses of an ICMPv6 packet
would cause the checksum to no longer be correct as the psuedoheader
did not match.
Introduced by commit 3fdbd1ce

 ("openvswitch: add ipv6 'set' action").

Reported-by: Neal Shrader <icosahedral@gmail.com>
Signed-off-by: Jesse Gross <jesse@nicira.com>
Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

Need to free memory in case of sample action error.

Introduced by commit 651887b0

 ("openvswitch: Sample
action without side effects").

Signed-off-by: Pravin B Shelar <pshelar@nicira.com>

Joe Stringer says:

====================
Implement ndo_gso_check() for vxlan nics

Most NICs that report NETIF_F_GSO_UDP_TUNNEL support VXLAN, and not other
UDP-based encapsulation protocols where the format and size of the header may
differ. This patch series implements a generic ndo_gso_check() for detecting
VXLAN, then reuses it for these NICs.

Implementation shamelessly stolen from Tom Herbert (with minor fixups):
http://thread.gmane.org/gmane.linux.network/332428/focus=333111



v2: Drop i40e/fm10k patches (code diverged; handling separately).
    Refactor common code into vxlan_gso_check() helper.
    Minor style fixes.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

Use vxlan_gso_check() to advertise offload support for this NIC.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Shahed Shaikh <shahed.shaikh@qlogic.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use vxlan_gso_check() to advertise offload support for this NIC.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Use vxlan_gso_check() to advertise offload support for this NIC.

Signed-off-by: Joe Stringer <joestringer@nicira.com>
Acked-by: Sathya Perla <sperla@emulex.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Most NICs that report NETIF_F_GSO_UDP_TUNNEL support VXLAN, and not
other UDP-based encapsulation protocols where the format and size of the
header differs. This patch implements a generic ndo_gso_check() for
VXLAN which will only advertise GSO support when the skb looks like it
contains VXLAN (or no UDP tunnelling at all).

Implementation shamelessly stolen from Tom Herbert:
http://thread.gmane.org/gmane.linux.network/332428/focus=333111



Signed-off-by: Joe Stringer <joestringer@nicira.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

John W. Linville says:

====================
pull request: wireless 2014-11-13

Please pull this set of a few more wireless fixes intended for the
3.18 stream...

For the mac80211 bits, Johannes says:

"This has just one fix, for an issue with the CCMP decryption
that can cause a kernel crash. I'm not sure it's remotely
exploitable, but it's an important fix nonetheless."

For the iwlwifi bits, Emmanuel says:

"Two fixes here - we weren't updating mac80211 if a scan
was cut short by RFKILL which confused cfg80211. As a
result, the latter wouldn't allow to run another scan.
Liad fixes a small bug in the firmware dump."

On top of that...

Arend van Spriel corrects a channel width conversion that caused a
WARNING in brcmfmac.

Hauke Mehrtens avoids a NULL pointer dereference in b43.

Larry Finger hits a trio of rtlwifi bugs left over from recent
backporting from the Realtek vendor driver.

Miaoqing Pan fixes a clocking problem in ath9k that could affect
packet timestamps and such.

Stanislaw Gruszka addresses an payload alignment issue that has been
plaguing rt2x00.

Please let me know if there are problems!
====================

Signed-off-by: David S. Miller <davem@davemloft.net>

There could be a signed overflow in the following code.

The expression, (32-logmask) is comprised between 0 and 31 included.
It may be equal to 31.
In such a case the left shift will produce a signed integer overflow.
According to the C99 Standard, this is an undefined behavior.
A simple fix is to replace the signed int 1 with the unsigned int 1U.

Signed-off-by: Vincent BENAYOUN <vincent.benayoun@trust-in-soft.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

After removal of the central spinlock nf_conntrack_lock, in
commit 93bb0ceb ("netfilter: conntrack: remove central
spinlock nf_conntrack_lock"), it is possible to race against
get_next_corpse().

The race is against the get_next_corpse() cleanup on
the "unconfirmed" list (a per-cpu list with seperate locking),
which set the DYING bit.

Fix this race, in __nf_conntrack_confirm(), by removing the CT
from unconfirmed list before checking the DYING bit.  In case
race occured, re-add the CT to the dying list.

While at this, fix coding style of the comment that has been
updated.

Fixes: 93bb0ceb

 ("netfilter: conntrack: remove central spinlock nf_conntrack_lock")
Reported-by: bill bonaparte <programme110@gmail.com>
Signed-off-by: bill bonaparte <programme110@gmail.com>
Signed-off-by: Jesper Dangaard Brouer <brouer@redhat.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

Pull virtio bugfix from Michael S Tsirkin:
 "This fixes a crash in virtio console multi-channel mode that got
  introduced in -rc1"

* tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost:
  virtio_console: move early VQ enablement

Pull networking fixes from David Miller:

 1) sunhme driver lacks DMA mapping error checks, based upon a report by
    Meelis Roos.

 2) Fix memory leak in mvpp2 driver, from Sudip Mukherjee.

 3) DMA memory allocation sizes are wrong in systemport ethernet driver,
    fix from Florian Fainelli.

 4) Fix use after free in mac80211 defragmentation code, from Johannes
    Berg.

 5) Some networking uapi headers missing from Kbuild file, from Stephen
    Hemminger.

 6) TUN driver gets csum_start offset wrong when VLAN accel is enabled,
    and macvtap has a similar bug, from Herbert Xu.

 7) Adjust several tunneling drivers to set dev->iflink after registry,
    because registry sets that to -1 overwriting whatever we did.  From
    Steffen Klassert.

 8) Geneve forgets to set inner tunneling type, causing GSO segmentation
    to fail on some NICs.  From Jesse Gross.

 9) Fix several locking bugs in stmmac driver, from Fabrice Gasnier and
    Giu...

Merge misc fixes from Andrew Morton:
 "15 fixes"

* emailed patches from Andrew Morton <akpm@linux-foundation.org>:
  MAINTAINERS: add IIO include files
  kernel/panic.c: update comments for print_tainted
  mem-hotplug: reset node present pages when hot-adding a new pgdat
  mem-hotplug: reset node managed pages when hot-adding a new pgdat
  mm/debug-pagealloc: correct freepage accounting and order resetting
  fanotify: fix notification of groups with inode & mount marks
  mm, compaction: prevent infinite loop in compact_zone
  mm: alloc_contig_range: demote pages busy message from warn to info
  mm/slab: fix unalignment problem on Malta with EVA due to slab merge
  mm/page_alloc: restrict max order of merging on isolated pageblock
  mm/page_alloc: move freepage counting logic to __free_one_page()
  mm/page_alloc: add freepage on isolate pageblock to correct buddy list
  mm/page_alloc: fix incorrect isolation behavior by rechecking migratetype
  mm/compaction: skip the range until proper target pageblock is met
  zram: avoid kunmap_atomic() of a NULL pointer

Pull Ceph fixes from Sage Weil:
 "There is an overflow bug fix for cephfs from Zheng, a fix for handling
  large authentication ticket buffers in libceph from Ilya, and a few
  fixes for the request handling code from Ilya that affect RBD volumes"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  libceph: change from BUG to WARN for __remove_osd() asserts
  libceph: clear r_req_lru_item in __unregister_linger_request()
  libceph: unlink from o_linger_requests when clearing r_osd
  libceph: do not crash on large auth tickets
  ceph: fix flush tid comparision

Pull HID fixes from Jiri Kosina:

 - fix for an oops in HID core upon repeated subdriver insertion/removal
   under certain circumstances, by Benjamin Tissoires

 - quirk for another Elan Touchscreen device, by Adel Gadllah

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/hid:
  HID: core: cleanup .claimed field on disconnect
  HID: usbhid: enable always-poll quirk for Elan Touchscreen 0103

Files under include/linux/iio were not reported as part of the IIO
subsystem.

Signed-off-by: Daniel Baluta <daniel.baluta@intel.com>
Reported-by: Cristina Ciocan <cristina.ciocan@intel.com>
Reviewed-by: Jingoo Han <jg1.han@samsung.com>
Cc: Hartmut Knaack <knaack.h@gmx.de>
Cc: Lars-Peter Clausen <lars@metafoo.de>
Cc: Peter Meerwald <pmeerw@pmeerw.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Commit 69361eef

 ("panic: add TAINT_SOFTLOCKUP") added the 'L' flag,
but failed to update the comments for print_tainted().  So, update the
comments.

Signed-off-by: Xie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

When memory is hot-added, all the memory is in offline state.  So clear
all zones' present_pages because they will be updated in online_pages()
and offline_pages().  Otherwise, /proc/zoneinfo will corrupt:

When the memory of node2 is offline:

  # cat /proc/zoneinfo
  ......
  Node 2, zone   Movable
  ......
        spanned  8388608
        present  8388608
        managed  0

When we online memory on node2:

  # cat /proc/zoneinfo
  ......
  Node 2, zone   Movable
  ......
        spanned  8388608
        present  16777216
        managed  8388608

Signed-off-by: Tang Chen <tangchen@cn.fujitsu.com>
Reviewed-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com>
Cc: <stable@vger.kernel.org>	[3.16+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

In free_area_init_core(), zone->managed_pages is set to an approximate
value for lowmem, and will be adjusted when the bootmem allocator frees
pages into the buddy system.

But free_area_init_core() is also called by hotadd_new_pgdat() when
hot-adding memory.  As a result, zone->managed_pages of the newly added
node's pgdat is set to an approximate value in the very beginning.

Even if the memory on that node has node been onlined,
/sys/device/system/node/nodeXXX/meminfo has wrong value:

  hot-add node2 (memory not onlined)
  cat /sys/device/system/node/node2/meminfo
  Node 2 MemTotal:       33554432 kB
  Node 2 MemFree:               0 kB
  Node 2 MemUsed:        33554432 kB
  Node 2 Active:                0 kB

This patch fixes this problem by reset node managed pages to 0 after
hot-adding a new node.

1. Move reset_managed_pages_done from reset_node_managed_pages() to
   reset_all_zones_managed_pages()
2. Make reset_node_managed_pages()...

One thing I did in this patch is fixing freepage accounting.  If we
clear guard page and link it onto isolate buddy list, we should not
increase freepage count.  This patch adds conditional branch to skip
counting in this case.  Without this patch, this overcounting happens
frequently if guard order is set and CMA is used.

Another thing fixed in this patch is the target to reset order.  In
__free_one_page(), we check the buddy page whether it is a guard page or
not.  And, if so, we should clear guard attribute on the buddy page and
reset order of it to 0.  But, current code resets original page's order
rather than buddy one's.  Maybe, this doesn't have any problem, because
whole merged page's order will be re-assigned soon.  But, it is better
to correct code.

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Gioh Kim <gioh.kim@lge.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>