FreshBSD

afs: Fix missing timeout reset

In afs_wait_for_call_to_complete(), rather than immediately aborting an
operation if a signal occurs, the code attempts to wait for it to
complete, using a schedule timeout of 2*RTT (or min 2 jiffies) and a
check that we're still receiving relevant packets from the server before
we consider aborting the call.  We may even ping the server to check on
the status of the call.

However, there's a missing timeout reset in the event that we do
actually get a packet to process, such that if we then get a couple of
short stalls, we then time out when progress is actually being made.

Fix this by resetting the timeout any time we get something to process.
If it's the failure of the call then the call state will get changed and
we'll exit the loop shortly thereafter.

A symptom of this is data fetches and stores failing with EINTR when
they really shouldn't.

Fixes: bc5e3a546d55 ("rxrpc: Use MSG_WAITALL to tell sendmsg() to temporarily ignore 
signals")
Signed-off-by: David Howells <dhowells at redhat.com>
Reviewed-by: Marc Dionne <marc.dionne at auristor.com>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

mdio_bus: Fix init if CONFIG_RESET_CONTROLLER=n

Commit 1d4639567d97 ("mdio_bus: Fix PTR_ERR applied after initialization
to constant") accidentally changed a check from -ENOTSUPP to -ENOSYS,
causing failures if reset controller support is not enabled.  E.g. on
r7s72100/rskrza1:

    sh-eth e8203000.ethernet: MDIO init failed: -524
    sh-eth: probe of e8203000.ethernet failed with error -524

Seen on r8a7740/armadillo, r7s72100/rskrza1, and r7s9210/rza2mevb.

Fixes: 1d4639567d97 ("mdio_bus: Fix PTR_ERR applied after initialization to constant")
Signed-off-by: Geert Uytterhoeven <geert+renesas at glider.be>
Cc: YueHaibing <yuehaibing at huawei.com>
Cc: David S. Miller <davem at davemloft.net>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

Linux 5.4-rc8

Merge tag 'iommu-fixes-v5.4-rc7' of 
git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu

Pull iommu fixes from Joerg Roedel:

 - Fix for Intel IOMMU to correct invalidation commands when in SVA
   mode.

 - Update MAINTAINERS entry for Intel IOMMU

* tag 'iommu-fixes-v5.4-rc7' of git://git.kernel.org/pub/scm/linux/kernel/git/joro/iommu:
  iommu/vt-d: Fix QI_DEV_IOTLB_PFSID and QI_DEV_EIOTLB_PFSID macros
  MAINTAINERS: Update for INTEL IOMMU (VT-d) entry

Merge branch 'sched-urgent-for-linus' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull misc scheduler fixes from Ingo Molnar:

 - Fix potential deadlock under CONFIG_DEBUG_OBJECTS=y

 - PELT metrics update ordering fix

 - uclamp logic fix

* 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  sched/uclamp: Fix incorrect condition
  sched/pelt: Fix update of blocked PELT ordering
  sched/core: Avoid spurious lock dependencies

Merge branch 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux

Pull i2c fixes from Wolfram Sang:
 "An I2C core fix to prevent a use-after-free in a rare error path,
  and an I2C ACPI addition to work around broken HW/firmware related
  to touchscreens"

* 'i2c/for-current' of git://git.kernel.org/pub/scm/linux/kernel/git/wsa/linux:
  i2c: core: fix use after free in of_i2c_notify
  i2c: acpi: Force bus speed to 400KHz if a Silead touchscreen is present

Merge branch 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6

Pull crypto fix from Herbert Xu:
 "This reverts a number of changes to the khwrng thread which feeds the
  kernel random number pool from hwrng drivers. They were trying to fix
  issues with suspend-and-resume but ended up causing regressions"

* 'linus' of git://git.kernel.org/pub/scm/linux/kernel/git/herbert/crypto-2.6:
  Revert "hwrng: core - Freeze khwrng thread during suspend"

Revert "hwrng: core - Freeze khwrng thread during suspend"

This reverts commit 03a3bb7ae631 ("hwrng: core - Freeze khwrng
thread during suspend"), ff296293b353 ("random: Support freezable
kthreads in add_hwgenerator_randomness()") and 59b569480dc8 ("random:
Use wait_event_freezable() in add_hwgenerator_randomness()").

These patches introduced regressions and we need more time to
get them ready for mainline.

Signed-off-by: Herbert Xu <herbert at gondor.apana.org.au>

Merge branch 'x86-urgent-for-linus' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Ingo Molnar:
 "Two fixes: disable unreliable HPET on Intel Coffe Lake platforms, and
  fix a lockdep splat in the resctrl code"

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Fix potential lockdep warning
  x86/quirks: Disable HPET on Intel Coffe Lake platforms

Merge branch 'timers-urgent-for-linus' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull timer fix from Ingo Molnar:
 "Fix integer truncation bug in __do_adjtimex()"

* 'timers-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  ntp/y2038: Remove incorrect time_t truncation

Merge branch 'perf-urgent-for-linus' of 
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull perf fixes from Ingo Molnar:
 "Misc fixes: a handful of AUX event handling related fixes, a Sparse
  fix and two ABI fixes"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf/core: Fix missing static inline on perf_cgroup_switch()
  perf/core: Consistently fail fork on allocation failures
  perf/aux: Disallow aux_output for kernel events
  perf/core: Reattach a misplaced comment
  perf/aux: Fix the aux_output group inheritance fix
  perf/core: Disallow uncore-cgroup events

Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net

Pull networking fixes from David Miller:

 1) Fix memory leak in xfrm_state code, from Steffen Klassert.

 2) Fix races between devlink reload operations and device
    setup/cleanup, from Jiri Pirko.

 3) Null deref in NFC code, from Stephan Gerhold.

 4) Refcount fixes in SMC, from Ursula Braun.

 5) Memory leak in slcan open error paths, from Jouni Hogander.

 6) Fix ETS bandwidth validation in hns3, from Yonglong Liu.

 7) Info leak on short USB request answers in ax88172a driver, from
    Oliver Neukum.

 8) Release mem region properly in ep93xx_eth, from Chuhong Yuan.

 9) PTP config timestamp flags validation, from Richard Cochran.

10) Dangling pointers after SKB data realloc in seg6, from Andrea Mayer.

    [25 lines not shown]

ipmr: Fix skb headroom in ipmr_get_route().

In route.c, inet_rtm_getroute_build_skb() creates an skb with no
headroom. This skb is then used by inet_rtm_getroute() which may pass
it to rt_fill_info() and, from there, to ipmr_get_route(). The later
might try to reuse this skb by cloning it and prepending an IPv4
header. But since the original skb has no headroom, skb_push() triggers
skb_under_panic():

skbuff: skb_under_panic: text:00000000ca46ad8a len:80 put:20 head:00000000cd28494e 
data:000000009366fd6b tail:0x3c end:0xec0 dev:veth0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:108!
invalid opcode: 0000 [#1] SMP KASAN PTI
CPU: 6 PID: 587 Comm: ip Not tainted 5.4.0-rc6+ #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.12.0-2.fc30 04/01/2014
RIP: 0010:skb_panic+0xbf/0xd0
Code: 41 a2 ff 8b 4b 70 4c 8b 4d d0 48 c7 c7 20 76 f5 8b 44 8b 45 bc 48 8b 55 c0 48 8b 75 
c8 41 54 41 57 41 56 41 55 e8 75 dc 7a ff <0f> 0b 0f 1f 44 00 00 66 2e 0f 1f 84 00 00 00 
00 00 0f 1f 44 00 00
RSP: 0018:ffff888059ddf0b0 EFLAGS: 00010286
RAX: 0000000000000086 RBX: ffff888060a315c0 RCX: ffffffff8abe4822
RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff88806c9a79cc
RBP: ffff888059ddf118 R08: ffffed100d9361b1 R09: ffffed100d9361b0
R10: ffff88805c68aee3 R11: ffffed100d9361b1 R12: ffff88805d218000

    [37 lines not shown]

net: hns3: cleanup of stray struct hns3_link_mode_mapping

This patch cleans-up the stray left over code. It has no
functionality impact.

Signed-off-by: Salil Mehta <salil.mehta at huawei.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

net/smc: fix fastopen for non-blocking connect()

FASTOPEN does not work with SMC-sockets. Since SMC allows fallback to
TCP native during connection start, the FASTOPEN setsockopts trigger
this fallback, if the SMC-socket is still in state SMC_INIT.
But if a FASTOPEN setsockopt is called after a non-blocking connect(),
this is broken, and fallback does not make sense.
This change complements
commit cd2063604ea6 ("net/smc: avoid fallback in case of non-blocking connect")
and fixes the syzbot reported problem "WARNING in smc_unhash_sk".

Reported-by: syzbot+8488cc4cf1c9e09b8b86 at syzkaller.appspotmail.com
Fixes: e1bbdd570474 ("net/smc: reduce sock_put() for fallback sockets")
Signed-off-by: Ursula Braun <ubraun at linux.ibm.com>
Signed-off-by: Karsten Graul <kgraul at linux.ibm.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

rds: ib: update WR sizes when bringing up connection

Currently WR sizes are updated from rds_ib_sysctl_max_send_wr and
rds_ib_sysctl_max_recv_wr when a connection is shut down. As a result,
a connection being down while rds_ib_sysctl_max_send_wr or
rds_ib_sysctl_max_recv_wr are updated, will not update the sizes when
it comes back up.

Move resizing of WRs to rds_ib_setup_qp so that connections will be setup
with the most current WR sizes.

Signed-off-by: Dag Moxnes <dag.moxnes at oracle.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar at oracle.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

net: gemini: add missed free_netdev

This driver forgets to free allocated netdev in remove like
what is done in probe failure.
Add the free to fix it.

Signed-off-by: Chuhong Yuan <hslester96 at gmail.com>
Reviewed-by: Linus Walleij <linus.walleij at linaro.org>
Signed-off-by: David S. Miller <davem at davemloft.net>

net: dsa: tag_8021q: Fix dsa_8021q_restore_pvid for an absent pvid

This sequence of operations:
ip link set dev br0 type bridge vlan_filtering 1
bridge vlan del dev swp2 vid 1
ip link set dev br0 type bridge vlan_filtering 1
ip link set dev br0 type bridge vlan_filtering 0

apparently fails with the message:

[   31.305716] sja1105 spi0.1: Reset switch and programmed static config. Reason: VLAN 
filtering
[   31.322161] sja1105 spi0.1: Couldn't determine PVID attributes (pvid 0)
[   31.328939] sja1105 spi0.1: Failed to setup VLAN tagging for port 1: -2
[   31.335599] ------------[ cut here ]------------
[   31.340215] WARNING: CPU: 1 PID: 194 at net/switchdev/switchdev.c:157 
switchdev_port_attr_set_now+0x9c/0xa4
[   31.349981] br0: Commit of attribute (id=6) failed.
[   31.354890] Modules linked in:
[   31.357942] CPU: 1 PID: 194 Comm: ip Not tainted 5.4.0-rc6-01792-gf4f632e07665-dirty 
#2062
[   31.366167] Hardware name: Freescale LS1021A
[   31.370437] [<c03144dc>] (unwind_backtrace) from [<c030e184>] (show_stack+0x10/0x14)
[   31.378153] [<c030e184>] (show_stack) from [<c11d1c1c>] (dump_stack+0xe0/0x10c)
[   31.385437] [<c11d1c1c>] (dump_stack) from [<c034c730>] (__warn+0xf4/0x10c)

    [48 lines not shown]

seg6: fix skb transport_header after decap_and_validate()

in the receive path (more precisely in ip6_rcv_core()) the
skb->transport_header is set to skb->network_header + sizeof(*hdr). As a
consequence, after routing operations, destination input expects to find
skb->transport_header correctly set to the next protocol (or extension
header) that follows the network protocol. However, decap behaviors (DX*,
DT*) remove the outer IPv6 and SRH extension and do not set again the
skb->transport_header pointer correctly. For this reason, the patch sets
the skb->transport_header to the skb->network_header + sizeof(hdr) in each
DX* and DT* behavior.

Signed-off-by: Andrea Mayer <andrea.mayer at uniroma2.it>
Signed-off-by: David S. Miller <davem at davemloft.net>

seg6: fix srh pointer in get_srh()

pskb_may_pull may change pointers in header. For this reason, it is
mandatory to reload any pointer that points into skb header.

Signed-off-by: Andrea Mayer <andrea.mayer at uniroma2.it>
Signed-off-by: David S. Miller <davem at davemloft.net>

Merge branch 'seg6-fixes-to-Segment-Routing-in-IPv6'

Andrea Mayer says:

====================
seg6: fixes to Segment Routing in IPv6

This patchset is divided in 2 patches and it introduces some fixes
to Segment Routing in IPv6, which are:

- in function get_srh() fix the srh pointer after calling
  pskb_may_pull();

- fix the skb->transport_header after calling decap_and_validate()
  function;

Any comments on the patchset are welcome.
====================

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

octeontx2-af: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style in
header files related to Marvell OcteonTX2 network devices.
It uses an expilict block comment for the SPDX License
Identifier.

Changes made by using a script provided by Joe Perches here:
https://lkml.org/lkml/2019/2/7/46.

Suggested-by: Joe Perches <joe at perches.com>
Signed-off-by: Nishad Kamdar <nishadkamdar at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

net: stmmac: Use the correct style for SPDX License Identifier

This patch corrects the SPDX License Identifier style in
header files related to STMicroelectronics based Multi-Gigabit
Ethernet driver. For C header files Documentation/process/license-rules.rst
mandates C-like comments (opposed to C source files where
C++ style should be used).

Changes made by using a script provided by Joe Perches here:
https://lkml.org/lkml/2019/2/7/46.

Suggested-by: Joe Perches <joe at perches.com>
Signed-off-by: Nishad Kamdar <nishadkamdar at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

Merge branch 'akpm' (patches from Andrew)

Merge misc fixes from Andrew Morton:
 "11 fixes"

MM fixes and one xz decompressor fix.

* emailed patches from Andrew Morton <akpm at linux-foundation.org>:
  mm/debug.c: PageAnon() is true for PageKsm() pages
  mm/debug.c: __dump_page() prints an extra line
  mm/page_io.c: do not free shared swap slots
  mm/memory_hotplug: fix try_offline_node()
  mm,thp: recheck each page before collapsing file THP
  mm: slub: really fix slab walking for init_on_free
  mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup()
  mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()
  lib/xz: fix XZ_DYNALLOC to avoid useless memory reallocations
  mm: fix trying to reclaim unevictable lru page when calling madvise_pageout
  mm: mempolicy: fix the wrong return value and potential pages leak of mbind

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input

Pull more input fixes from Dmitry Torokhov:
 "A couple of fixes in driver teardown paths and another ID for
  Synaptics RMI mode"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input:
  Input: synaptics - enable RMI mode for X1 Extreme 2nd Generation
  Input: synaptics-rmi4 - destroy F54 poller workqueue when removing
  Input: ff-memless - kill timer in destroy()

mm/debug.c: PageAnon() is true for PageKsm() pages

PageAnon() and PageKsm() use the low two bits of the page->mapping
pointer to indicate the page type.  PageAnon() only checks the LSB while
PageKsm() checks the least significant 2 bits are equal to 3.

Therefore, PageAnon() is true for KSM pages.  __dump_page() incorrectly
will never print "ksm" because it checks PageAnon() first.  Fix this by
checking PageKsm() first.

Link: http://lkml.kernel.org/r/20191113000651.20677-1-rcampbell at nvidia.com
Fixes: 1c6fb1d89e73 ("mm: print more information about mapping in __dump_page")
Signed-off-by: Ralph Campbell <rcampbell at nvidia.com>
Acked-by: Michal Hocko <mhocko at suse.com>
Cc: Jerome Glisse <jglisse at redhat.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

lib/xz: fix XZ_DYNALLOC to avoid useless memory reallocations

s->dict.allocated was initialized to 0 but never set after a successful
allocation, thus the code always thought that the dictionary buffer has
to be reallocated.

Link: http://lkml.kernel.org/r/20191104185107.3b6330df at tukaani.org
Signed-off-by: Lasse Collin <lasse.collin at tukaani.org>
Reported-by: Yu Sun <yusun2 at cisco.com>
Acked-by: Daniel Walker <danielwa at cisco.com>
Cc: "Yixia Si (yisi)" <yisi at cisco.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()

We've encountered a rcu stall in get_mem_cgroup_from_mm():

  rcu: INFO: rcu_sched self-detected stall on CPU
  rcu: 33-....: (21000 ticks this GP) idle=6c6/1/0x4000000000000002 softirq=35441/35441 
fqs=5017
  (t=21031 jiffies g=324821 q=95837) NMI backtrace for cpu 33
  <...>
  RIP: 0010:get_mem_cgroup_from_mm+0x2f/0x90
  <...>
   __memcg_kmem_charge+0x55/0x140
   __alloc_pages_nodemask+0x267/0x320
   pipe_write+0x1ad/0x400
   new_sync_write+0x127/0x1c0
   __kernel_write+0x4f/0xf0
   dump_emit+0x91/0xc0
   writenote+0xa0/0xc0
   elf_core_dump+0x11af/0x1430
   do_coredump+0xc65/0xee0
   get_signal+0x132/0x7c0
   do_signal+0x36/0x640
   exit_to_usermode_loop+0x61/0xd0
   do_syscall_64+0xd4/0x100
   entry_SYSCALL_64_after_hwframe+0x44/0xa9

    [32 lines not shown]

mm: hugetlb: switch to css_tryget() in hugetlb_cgroup_charge_cgroup()

An exiting task might belong to an offline cgroup.  In this case an
attempt to grab a cgroup reference from the task can end up with an
infinite loop in hugetlb_cgroup_charge_cgroup(), because neither the
cgroup will become online, neither the task will be migrated to a live
cgroup.

Fix this by switching over to css_tryget().  As css_tryget_online()
can't guarantee that the cgroup won't go offline, in most cases the
check doesn't make sense.  In this particular case users of
hugetlb_cgroup_charge_cgroup() are not affected by this change.

A similar problem is described by commit 18fa84a2db0e ("cgroup: Use
css_tryget() instead of css_tryget_online() in task_get_css()").

Link: http://lkml.kernel.org/r/20191106225131.3543616-2-guro at fb.com
Signed-off-by: Roman Gushchin <guro at fb.com>
Acked-by: Johannes Weiner <hannes at cmpxchg.org>
Acked-by: Tejun Heo <tj at kernel.org>
Reviewed-by: Shakeel Butt <shakeelb at google.com>
Cc: Michal Hocko <mhocko at kernel.org>
Cc: <stable at vger.kernel.org>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>

mm,thp: recheck each page before collapsing file THP

In collapse_file(), for !is_shmem case, current check cannot guarantee
the locked page is up-to-date.  Specifically, xas_unlock_irq() should
not be called before lock_page() and get_page(); and it is necessary to
recheck PageUptodate() after locking the page.

With this bug and CONFIG_READ_ONLY_THP_FOR_FS=y, madvise(HUGE)'ed .text
may contain corrupted data.  This is because khugepaged mistakenly
collapses some not up-to-date sub pages into a huge page, and assumes
the huge page is up-to-date.  This will NOT corrupt data in the disk,
because the page is read-only and never written back.  Fix this by
properly checking PageUptodate() after locking the page.  This check
replaces "VM_BUG_ON_PAGE(!PageUptodate(page), page);".

Also, move PageDirty() check after locking the page.  Current khugepaged
should not try to collapse dirty file THP, because it is limited to
read-only .text.  The only case we hit a dirty page here is when the
page hasn't been written since write.  Bail out and retry when this
happens.

syzbot reported bug on previous version of this patch.

Link: http://lkml.kernel.org/r/20191106060930.2571389-2-songliubraving at fb.com
Fixes: 99cb0dbd47a1 ("mm,thp: add read-only THP support for (non-shmem) FS")

    [8 lines not shown]

mm/page_io.c: do not free shared swap slots

The following race is observed due to which a processes faulting on a
swap entry, finds the page neither in swapcache nor swap.  This causes
zram to give a zero filled page that gets mapped to the process,
resulting in a user space crash later.

Consider parent and child processes Pa and Pb sharing the same swap slot
with swap_count 2.  Swap is on zram with SWP_SYNCHRONOUS_IO set.
Virtual address 'VA' of Pa and Pb points to the shared swap entry.

Pa                                       Pb

fault on VA                              fault on VA
do_swap_page                             do_swap_page
lookup_swap_cache fails                  lookup_swap_cache fails
                                         Pb scheduled out
swapin_readahead (deletes zram entry)
swap_free (makes swap_count 1)
                                         Pb scheduled in
                                         swap_readpage (swap_count == 1)
                                         Takes SWP_SYNCHRONOUS_IO path
                                         zram enrty absent
                                         zram gives a zero filled page


    [14 lines not shown]

mm/debug.c: __dump_page() prints an extra line

When dumping struct page information, __dump_page() prints the page type
with a trailing blank followed by the page flags on a separate line:

  anon
  flags: 0x100000000090034(uptodate|lru|active|head|swapbacked)

It looks like the intent was to use pr_cont() for printing "flags:" but
pr_cont() usage is discouraged so fix this by extending the format to
include the flags into a single line:

  anon flags: 0x100000000090034(uptodate|lru|active|head|swapbacked)

If the page is file backed, the name might be long so use two lines:

  shmem_aops name:"dev/zero"
  flags: 0x10000000008000c(uptodate|dirty|swapbacked)

Eliminate pr_conf() usage as well for appending compound_mapcount.

Link: http://lkml.kernel.org/r/20191112012608.16926-1-rcampbell at nvidia.com
Signed-off-by: Ralph Campbell <rcampbell at nvidia.com>
Reviewed-by: Andrew Morton <akpm at linux-foundation.org>
Cc: Jerome Glisse <jglisse at redhat.com>

    [2 lines not shown]

mm/memory_hotplug: fix try_offline_node()

try_offline_node() is pretty much broken right now:

 - The node span is updated when onlining memory, not when adding it. We
   ignore memory that was mever onlined. Bad.

 - We touch possible garbage memmaps. The pfn_to_nid(pfn) can easily
   trigger a kernel panic. Bad for memory that is offline but also bad
   for subsection hotadd with ZONE_DEVICE, whereby the memmap of the
   first PFN of a section might contain garbage.

 - Sections belonging to mixed nodes are not properly considered.

As memory blocks might belong to multiple nodes, we would have to walk
all pageblocks (or at least subsections) within present sections.
However, we don't have a way to identify whether a memmap that is not
online was initialized (relevant for ZONE_DEVICE).  This makes things
more complicated.

Luckily, we can piggy pack on the node span and the nid stored in memory
blocks.  Currently, the node span is grown when calling
move_pfn_range_to_zone() - e.g., when onlining memory, and shrunk when
removing memory, before calling try_offline_node().  Sysfs links are
created via link_mem_sections(), e.g., during boot or when adding

    [71 lines not shown]

mm: slub: really fix slab walking for init_on_free

Commit 1b7e816fc80e ("mm: slub: Fix slab walking for init_on_free")
fixed one problem with the slab walking but missed a key detail: When
walking the list, the head and tail pointers need to be updated since we
end up reversing the list as a result.  Without doing this, bulk free is
broken.

One way this is exposed is a NULL pointer with slub_debug=F:

  =============================================================================
  BUG skbuff_head_cache (Tainted: G                T): Object already free
  -----------------------------------------------------------------------------

  INFO: Slab 0x000000000d2d2f8f objects=16 used=3 fp=0x0000000064309071 
flags=0x3fff00000000201
  BUG: kernel NULL pointer dereference, address: 0000000000000000
  Oops: 0000 [#1] PREEMPT SMP PTI
  RIP: 0010:print_trailer+0x70/0x1d5
  Call Trace:
   <IRQ>
   free_debug_processing.cold.37+0xc9/0x149
   __slab_free+0x22a/0x3d0
   kmem_cache_free_bulk+0x415/0x420
   __kfree_skb_flush+0x30/0x40

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mm: mempolicy: fix the wrong return value and potential pages leak of mbind

Commit d883544515aa ("mm: mempolicy: make the behavior consistent when
MPOL_MF_MOVE* and MPOL_MF_STRICT were specified") fixed the return value
of mbind() for a couple of corner cases.  But, it altered the errno for
some other cases, for example, mbind() should return -EFAULT when part
or all of the memory range specified by nodemask and maxnode points
outside your accessible address space, or there was an unmapped hole in
the specified memory range specified by addr and len.

Fix this by preserving the errno returned by queue_pages_range().  And,
the pagelist may be not empty even though queue_pages_range() returns
error, put the pages back to LRU since mbind_range() is not called to
really apply the policy so those pages should not be migrated, this is
also the old behavior before the problematic commit.

Link: http://lkml.kernel.org/r/1572454731-3925-1-git-send-email-yang.shi at linux.alibaba.com
Fixes: d883544515aa ("mm: mempolicy: make the behavior consistent when MPOL_MF_MOVE* and 
MPOL_MF_STRICT were specified")
Signed-off-by: Yang Shi <yang.shi at linux.alibaba.com>
Reported-by: Li Xinhai <lixinhai.lxh at gmail.com>
Reviewed-by: Li Xinhai <lixinhai.lxh at gmail.com>
Cc: Vlastimil Babka <vbabka at suse.cz>
Cc: Michal Hocko <mhocko at suse.com>
Cc: Mel Gorman <mgorman at techsingularity.net>

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mm: fix trying to reclaim unevictable lru page when calling madvise_pageout

Recently, I hit the following issue when running upstream.

  kernel BUG at mm/vmscan.c:1521!
  invalid opcode: 0000 [#1] SMP KASAN PTI
  CPU: 0 PID: 23385 Comm: syz-executor.6 Not tainted 5.4.0-rc4+ #1
  RIP: 0010:shrink_page_list+0x12b6/0x3530 mm/vmscan.c:1521
  Call Trace:
   reclaim_pages+0x499/0x800 mm/vmscan.c:2188
   madvise_cold_or_pageout_pte_range+0x58a/0x710 mm/madvise.c:453
   walk_pmd_range mm/pagewalk.c:53 [inline]
   walk_pud_range mm/pagewalk.c:112 [inline]
   walk_p4d_range mm/pagewalk.c:139 [inline]
   walk_pgd_range mm/pagewalk.c:166 [inline]
   __walk_page_range+0x45a/0xc20 mm/pagewalk.c:261
   walk_page_range+0x179/0x310 mm/pagewalk.c:349
   madvise_pageout_page_range mm/madvise.c:506 [inline]
   madvise_pageout+0x1f0/0x330 mm/madvise.c:542
   madvise_vma mm/madvise.c:931 [inline]
   __do_sys_madvise+0x7d2/0x1600 mm/madvise.c:1113
   do_syscall_64+0x9f/0x4c0 arch/x86/entry/common.c:290
   entry_SYSCALL_64_after_hwframe+0x49/0xbe

madvise_pageout() accesses the specified range of the vma and isolates

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Input: synaptics - enable RMI mode for X1 Extreme 2nd Generation

Just got one of these for debugging some unrelated issues, and noticed
that Lenovo seems to have gone back to using RMI4 over smbus with
Synaptics touchpads on some of their new systems, particularly this one.
So, let's enable RMI mode for the X1 Extreme 2nd Generation.

Signed-off-by: Lyude Paul <lyude at redhat.com>
Link: https://lore.kernel.org/r/20191115221814.31903-1-lyude at redhat.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov at gmail.com>

Merge tag 'for-linus-20191115' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "A few fixes that should make it into this release. This contains:

   - io_uring:
        - The timeout command assumes sequence == 0 means that we want
          one completion, but this kind of overloading is unfortunate as
          it prevents users from doing a pure time based wait. Since
          this operation was introduced in this cycle, let's correct it
          now, while we can. (me)
        - One-liner to fix an issue with dependent links and fixed
          buffer reads. The actual IO completed fine, but the link got
          severed since we stored the wrong expected value. (me)
        - Add TIMEOUT to list of opcodes that don't need a file. (Pavel)

   - rsxx missing workqueue destry calls. Old bug. (Chuhong)

   - Fix blk-iocost active list check (Jiufei)

   - Fix impossible-to-hit overflow merge condition, that still hit some
     folks very rarely (Junichi)

   - Fix bfq hang issue from 5.3. This didn't get marked for stable, but
     will go into stable post this merge (Paolo)"

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i2c: core: fix use after free in of_i2c_notify

We can't use "adap->dev" after it has been freed.

Fixes: 5bf4fa7daea6 ("i2c: break out OF support into separate file")
Signed-off-by: Wen Yang <wenyang at linux.alibaba.com>
Signed-off-by: Wolfram Sang <wsa at the-dreams.de>

i2c: acpi: Force bus speed to 400KHz if a Silead touchscreen is present

Many cheap devices use Silead touchscreen controllers. Testing has shown
repeatedly that these touchscreen controllers work fine at 400KHz, but for
unknown reasons do not work properly at 100KHz. This has been seen on
both ARM and x86 devices using totally different i2c controllers.

On some devices the ACPI tables list another device at the same I2C-bus
as only being capable of 100KHz, testing has shown that these other
devices work fine at 400KHz (as can be expected of any recent I2C hw).

This commit makes i2c_acpi_find_bus_speed() always return 400KHz if a
Silead touchscreen controller is present, fixing the touchscreen not
working on devices which ACPI tables' wrongly list another device on the
same bus as only being capable of 100KHz.

Specifically this fixes the touchscreen on the Jumper EZpad 6 m4 not
working.

Reported-by: youling 257 <youling257 at gmail.com>
Tested-by: youling 257 <youling257 at gmail.com>
Signed-off-by: Hans de Goede <hdegoede at redhat.com>
Reviewed-by: Jarkko Nikula <jarkko.nikula at linux.intel.com>
Acked-by: Mika Westerberg <mika.westerberg at linux.intel.com>
[wsa: rewording warning a little]

    [2 lines not shown]

ptp: Extend the test program to check the external time stamp flags.

Because each driver and hardware has different capabilities, the test
cannot provide a simple pass/fail result, but it can at least show what
combinations of flags are supported.

Signed-off-by: Richard Cochran <richardcochran at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

Merge branch 'ptp-Validate-the-ancillary-ioctl-flags-more-carefully'

Richard Cochran says:

====================
ptp: Validate the ancillary ioctl flags more carefully.

The flags passed to the ioctls for periodic output signals and
time stamping of external signals were never checked, and thus formed
a useless ABI inadvertently.  More recently, a version 2 of the ioctls
was introduced in order make the flags meaningful.  This series
tightens up the checks on the new ioctl flags.

- Patch 1 ensures at least one edge flag is set for the new ioctl.
- Patches 2-7 are Jacob's recent checks, picking up the tags.
- Patch 8 introduces a "strict" flag for passing to the drivers when the
  new ioctl is used.
- Patches 9-12 implement the "strict" checking in the drivers.
- Patch 13 extends the test program to exercise combinations of flags.
====================

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

mlx5: Reject requests to enable time stamping on both edges.

This driver enables rising edge or falling edge, but not both, and so
this patch validates that the request contains only one of the two
edges.

Signed-off-by: Richard Cochran <richardcochran at gmail.com>
Reviewed-by: Saeed Mahameed <saeedm at mellanox.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

igb: Reject requests that fail to enable time stamping on both edges.

This hardware always time stamps rising and falling edges, and so this
patch validates that the request does contains both edges.

Signed-off-by: Richard Cochran <richardcochran at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

mv88e6xxx: Reject requests to enable time stamping on both edges.

This driver enables rising edge or falling edge, but not both, and so
this patch validates that the request contains only one of the two
edges.

Signed-off-by: Richard Cochran <richardcochran at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

ptp: Validate requests to enable time stamping of external signals.

Commit 415606588c61 ("PTP: introduce new versions of IOCTLs")
introduced a new external time stamp ioctl that validates the flags.
This patch extends the validation to ensure that at least one rising
or falling edge flag is set when enabling external time stamps.

Signed-off-by: Richard Cochran <richardcochran at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

renesas: reject unsupported external timestamp flags

Fix the renesas PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

Cc: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>
Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
Reviewed-by: Richard Cochran <richardcochran at gmail.com>
Reviewed-by: Sergei Shtylyov <sergei.shtylyov at cogentembedded.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

mlx5: reject unsupported external timestamp flags

Fix the mlx5 core PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

[ RC: I'm not 100% sure what this driver does, but if I'm not wrong it
      follows the dp83640:

  flags                                                 Meaning
  ----------------------------------------------------  --------------------------
  PTP_ENABLE_FEATURE                                    Time stamp rising edge
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE                    Time stamp rising edge
  PTP_ENABLE_FEATURE|PTP_FALLING_EDGE                   Time stamp falling edge
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE   Time stamp falling edge
]

Cc: Feras Daoud <ferasda at mellanox.com>
Cc: Eugenia Emantayev <eugenia at mellanox.com>
Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
Reviewed-by: Richard Cochran <richardcochran at gmail.com>

    [2 lines not shown]

igb: reject unsupported external timestamp flags

Fix the igb PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

This HW always time stamps both edges:

  flags                                                 Meaning
  ----------------------------------------------------  --------------------------
  PTP_ENABLE_FEATURE                                    Time stamp both edges
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE                    Time stamp both edges
  PTP_ENABLE_FEATURE|PTP_FALLING_EDGE                   Time stamp both edges
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE   Time stamp both edges

Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
Tested-by: Aaron Brown <aaron.f.brown at intel.com>
Signed-off-by: David S. Miller <davem at davemloft.net>

dp83640: reject unsupported external timestamp flags

Fix the dp83640 PTP support to explicitly reject any future flags that
get added to the external timestamp request ioctl.

In order to maintain currently functioning code, this patch accepts all
three current flags. This is because the PTP_RISING_EDGE and
PTP_FALLING_EDGE flags have unclear semantics and each driver seems to
have interpreted them slightly differently.

For the record, the semantics of this driver are:

  flags                                                 Meaning
  ----------------------------------------------------  --------------------------
  PTP_ENABLE_FEATURE                                    Time stamp rising edge
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE                    Time stamp rising edge
  PTP_ENABLE_FEATURE|PTP_FALLING_EDGE                   Time stamp falling edge
  PTP_ENABLE_FEATURE|PTP_RISING_EDGE|PTP_FALLING_EDGE   Time stamp falling edge

Cc: Stefan Sørensen <stefan.sorensen at spectralink.com>
Cc: Richard Cochran <richardcochran at gmail.com>
Signed-off-by: Jacob Keller <jacob.e.keller at intel.com>
Reviewed-by: Richard Cochran <richardcochran at gmail.com>
Signed-off-by: David S. Miller <davem at davemloft.net>