GFS2 remembers the last rgrp used for allocations in ip->i_rgd.
However, block allocations are made by way of a reservations structure,
ip->i_res, which keeps the last rgrp in ip->i_res.rs_rgd, and ip->i_res
is kept in sync with ip->i_res.rs_rgd, so it's redundant.  Get rid of
ip->i_rgd and just use ip->i_res.rs_rgd in its place.

Based on patches by Robert Peterson.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

In the resource group list code, keep the last resource group added in
the last position in the array.  Check against that instead of messing
with ip->i_rgd.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

current_kernel_time64() is now just a deprecated wrapper around
ktime_get_coarse_real_ts64(), so let's just call that directly.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

Rename end_off to end_len to make the code less confusing.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>

In two places, the gfs2_io_error_bh macro is called while holding the
sd_ail_lock spin lock.  This isn't allowed because gfs2_io_error_bh
withdraws the filesystem, which can sleep because it issues a uevent.
To fix that, add a gfs2_io_error_bh_wd macro that does withdraw the
filesystem and change gfs2_io_error_bh to not withdraw the filesystem.
In those places where the new gfs2_io_error_bh is used, withdraw the
filesystem after releasing sd_ail_lock.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Reviewed-by: Andrew Price <anprice@redhat.com>

Before this patch, block reservations kept track of the inode
number. At one point, that was a valid thing to do. However, since
we made the reservation a part of the inode (rather than a pointer
to a separate allocated object) the reservation can determine the
inode number by using container_of. This saves us a little memory
in our inode.
Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Acked-by: Steven Whitehouse <swhiteho@redhat.com>
Reviewed-by: Andreas Gruenbacher <agruenba@redhat.com>

Pull networking fixes from David Miller:

 1) Fix several bpfilter/UMH bugs, in particular make the UMH build not
    depend upon X86 specific Kconfig symbols. From Alexei Starovoitov.

 2) Fix handling of modified context pointer in bpf verifier, from
    Daniel Borkmann.

 3) Kill regression in ifdown/ifup sequences for hv_netvsc driver, from
    Dexuan Cui.

 4) When the bonding primary member name changes, we have to re-evaluate
    the bond->force_primary setting, from Xiangning Yu.

 5) Eliminate possible padding beyone end of SKB in cdc_ncm driver, from
    Bjørn Mork.

 6) RX queue length reported for UDP sockets in procfs and socket diag
    are inaccurate, from Paolo Abeni.

 7) Fix br_fdb_find_port() locking, from Petr Machata.

 8) Limit sk_rcvlowat values properly in TCP, from Soheil Hassas
    Yeganeh.

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/net: (23 commits)
  tcp: limit sk_rcvlowat by the maximum receive buffer
  net: phy: dp83822: use BMCR_ANENABLE instead of BMSR_ANEGCAPABLE for DP83620
  socket: close race condition between sock_close() and sockfs_setattr()
  net: bridge: Fix locking in br_fdb_find_port()
  udp: fix rx queue len reported by diag and proc interface
  cdc_ncm: avoid padding beyond end of skb
  net/sched: act_simple: fix parsing of TCA_DEF_DATA
  net: fddi: fix a possible null-ptr-deref
  net: aquantia: fix unsigned numvecs comparison with less than zero
  net: stmmac: fix build failure due to missing COMMON_CLK dependency
  bpfilter: fix race in pipe access
  bpf, xdp: fix crash in xdp_umem_unaccount_pages
  xsk: Fix umem fill/completion queue mmap on 32-bit
  tools/bpf: fix selftest get_cgroup_id_user
  bpfilter: fix OUTPUT_FORMAT
  umh: fix race condition
  net: mscc: ocelot: Fix uninitialized error in ocelot_netdevice_event()
  bonding: re-evaluate force_primary when the primary slave name changes
  ip_tunnel: Fix name string concatenate in __ip_tunnel_create()
  hv_netvsc: Fix a network regression after ifdown/ifup
  ...

Pull RTC updates from Alexandre Belloni:
 "Setting the supported range from drivers for RTCs failing soon has
  started. A few fixes are developed along the way. Some drivers have
  been switched to SPDX by their maintainers.

  Subsystem:

   - rework of the rtc-test driver which allows to test the core more
     thoroughly

   - rtc_set_alarm() now fails early when alarms are not supported

  Drivers:

   - mktime() is now replaced by mktime64()

   - RTC range added for 88pm80x, ab-b5ze-s3, at91rm9200,
     brcmstb-waketimer, ds1685, ftrtc010, ls1x, mxc_v2, rx8581, sprd,
     st-lpc, tps6586x, tps65910 and vr41xx

   - fixed a possible race condition in probe functions

   - pxa: fix the probe function that is broken since v4.3

   - stm32: now supports stm32mp1"

* tag 'rtc-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/abelloni/linux: (78 commits)
  rtc: pxa: fix probe function
  rtc: cros-ec: Switch to SPDX identifier.
  rtc: cros-ec: Make license text and module license match.
  rtc: ensure rtc_set_alarm fails when alarms are not supported
  rtc: test: remove alarm support from the first device
  rtc: test: convert to devm_rtc_allocate_device
  rtc: ftrtc010: let the core handle range
  rtc: ftrtc010: handle dates after 2106
  rtc: ftrtc010: switch to devm_rtc_allocate_device
  rtc: mrst: switch to devm functions
  rtc: sunxi: fix possible race condition
  rtc: test: remove irq sysfs file
  rtc: test: emulate alarms using timers
  rtc: test: store time as an offset to system time
  rtc: test: allow registering many devices
  rtc: test: remove useless proc info
  rtc: ds1685: Add range
  rtc: ds1685: fix possible race condition
  rtc: sprd: Add new RTC power down check method
  rtc: sun6i: Fix bit_idx value for clk_register_gate
  ...

Pull UBI and UBIFS updates from Richard Weinberger:

 - the UBI on-disk format header file is now dual licensed

 - new way to detect Fastmap problems during runtime

 - bugfix for Fastmap

 - minor updates for UBIFS (spelling, comments, vm_fault_t, ...)

* tag 'upstream-4.18-rc1' of git://git.infradead.org/linux-ubifs:
  mtd: ubi: Update ubi-media.h to dual license
  ubi: fastmap: Detect EBA mismatches on-the-fly
  ubi: fastmap: Check each mapping only once
  ubi: fastmap: Correctly handle interrupted erasures in EBA
  ubi: fastmap: Cancel work upon detach
  ubifs: lpt: Fix wrong pnode number range in comment
  ubifs: gc: Fix typo
  ubifs: log: Some spelling fixes
  ubifs: Spelling fix someting -> something
  ubifs: journal: Remove wrong comment
  ubifs: remove set but never used variable
  ubifs, xattr: remove misguided quota flags
  fs: ubifs: Adding new return type vm_fault_t

The user-provided value to setsockopt(SO_RCVLOWAT) can be
larger than the maximum possible receive buffer. Such values
mute POLLIN signals on the socket which can stall progress
on the socket.

Limit the user-provided value to half of the maximum receive
buffer, i.e., half of sk_rcvbuf when the receive buffer size
is set by the user, or otherwise half of sysctl_tcp_rmem[2].

Fixes: d1361840 ("tcp: fix SO_RCVLOWAT and RCVBUF autotuning")
Signed-off-by: Soheil Hassas Yeganeh <soheil@google.com>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reviewed-by: Neal Cardwell <ncardwell@google.com>
Acked-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull SCSI updates from James Bottomley:
 "This is mostly updates to the usual drivers: ufs, qedf, mpt3sas, lpfc,
  xfcp, hisi_sas, cxlflash, qla2xxx.

  In the absence of Nic, we're also taking target updates which are
  mostly minor except for the tcmu refactor.

  The only real core change to worry about is the removal of high page
  bouncing (in sas, storvsc and iscsi). This has been well tested and no
  problems have shown up so far"

* tag 'scsi-misc' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi: (268 commits)
  scsi: lpfc: update driver version to 12.0.0.4
  scsi: lpfc: Fix port initialization failure.
  scsi: lpfc: Fix 16gb hbas failing cq create.
  scsi: lpfc: Fix crash in blk_mq layer when executing modprobe -r lpfc
  scsi: lpfc: correct oversubscription of nvme io requests for an adapter
  scsi: lpfc: Fix MDS diagnostics failure (Rx < Tx)
  scsi: hisi_sas: Mark PHY as in reset for nexus reset
  scsi: hisi_sas: Fix return value when get_free_slot() failed
  scsi: hisi_sas: Terminate STP reject quickly for v2 hw
  scsi: hisi_sas: Add v2 hw force PHY function for internal ATA command
  scsi: hisi_sas: Include TMF elements in struct hisi_sas_slot
  scsi: hisi_sas: Try wait commands before before controller reset
  scsi: hisi_sas: Init disks after controller reset
  scsi: hisi_sas: Create a scsi_host_template per HW module
  scsi: hisi_sas: Reset disks when discovered
  scsi: hisi_sas: Add LED feature for v3 hw
  scsi: hisi_sas: Change common allocation mode of device id
  scsi: hisi_sas: change slot index allocation mode
  scsi: hisi_sas: Introduce hisi_sas_phy_set_linkrate()
  scsi: hisi_sas: fix a typo in hisi_sas_task_prep()
  ...

DP83620 register set is compatible with the DP83848, but it also supports
100base-FX. When the hardware is configured such as that fiber mode is
enabled, autonegotiation is not possible.

The chip, however, doesn't expose this information via BMSR_ANEGCAPABLE.
Instead, this bit is always set high, even if the particular hardware
configuration makes it so that auto negotiation is not possible [1]. Under
these circumstances, the phy subsystem keeps trying for autonegotiation to
happen, without success.

Hereby, we inspect BMCR_ANENABLE bit after genphy_config_init, which on
reset is set to 0 when auto negotiation is disabled, and so we use this
value instead of BMSR_ANEGCAPABLE.

[1] https://e2e.ti.com/support/interface/ethernet/f/903/p/697165/2571170Signed-off-by: Alvaro Gamez Machado <alvaro.gamez@hazent.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

fchownat() doesn't even hold refcnt of fd until it figures out
fd is really needed (otherwise is ignored) and releases it after
it resolves the path. This means sock_close() could race with
sockfs_setattr(), which leads to a NULL pointer dereference
since typically we set sock->sk to NULL in ->release().

As pointed out by Al, this is unique to sockfs. So we can fix this
in socket layer by acquiring inode_lock in sock_close() and
checking against NULL in sockfs_setattr().

sock_release() is called in many places, only the sock_close()
path matters here. And fortunately, this should not affect normal
sock_close() as it is only called when the last fd refcnt is gone.
It only affects sock_close() with a parallel sockfs_setattr() in
progress, which is not common.

Fixes: 86741ec2 ("net: core: Add a UID field to struct sock.")
Reported-by: shankarapailoor <shankarapailoor@gmail.com>
Cc: Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>
Cc: Lorenzo Colitti <lorenzo@google.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Pull cifs fixes from Steve French:

 - one smb3 (ACL related) fix for stable

 - one SMB3 security enhancement (when mounting -t smb3 forbid less
   secure dialects)

 - some RDMA and compounding fixes

* tag '4.18-fixes-smb3' of git://git.samba.org/sfrench/cifs-2.6:
  cifs: fix a buffer leak in smb2_query_symlink
  smb3: do not allow insecure cifs mounts when using smb3
  CIFS: Fix NULL ptr deref
  CIFS: fix encryption in SMB3.1.1
  CIFS: Pass page offset for encrypting
  CIFS: Pass page offset for calculating signature
  CIFS: SMBD: Support page offset in memory registration
  CIFS: SMBD: Support page offset in RDMA recv
  CIFS: SMBD: Support page offset in RDMA send
  CIFS: When sending data on socket, pass the correct page offset
  CIFS: Introduce helper function to get page offset and length in smb_rqst
  CIFS: Calculate the correct request length based on page offset and tail size
  cifs: For SMB2 security informaion query, check for minimum sized security descriptor instead of sizeof FileAllInformation class
  CIFS: Fix signing for SMB2/3

Pull block flush handling fix from Jens Axboe:
 "Single fix that we should merge now, fixing a regression in queuing
  flush request, accessing request flags after calling the end_request
  handler"

* tag 'for-linus-20180610' of git://git.kernel.dk/linux-block:
  block: fix use-after-free in block flush handling

Pull restartable sequence support from Thomas Gleixner:
 "The restartable sequences syscall (finally):

  After a lot of back and forth discussion and massive delays caused by
  the speculative distraction of maintainers, the core set of
  restartable sequences has finally reached a consensus.

  It comes with the basic non disputed core implementation along with
  support for arm, powerpc and x86 and a full set of selftests

  It was exposed to linux-next earlier this week, so it does not fully
  comply with the merge window requirements, but there is really no
  point to drag it out for yet another cycle"

* 'core-rseq-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  rseq/selftests: Provide Makefile, scripts, gitignore
  rseq/selftests: Provide parametrized tests
  rseq/selftests: Provide basic percpu ops test
  rseq/selftests: Provide basic test
  rseq/selftests: Provide rseq library
  selftests/lib.mk: Introduce OVERRIDE_TARGETS
  powerpc: Wire up restartable sequences system call
  powerpc: Add syscall detection for restartable sequences
  powerpc: Add support for restartable sequences
  x86: Wire up restartable sequence system call
  x86: Add support for restartable sequences
  arm: Wire up restartable sequences system call
  arm: Add syscall detection for restartable sequences
  arm: Add restartable sequences support
  rseq: Introduce restartable sequences system call
  uapi/headers: Provide types_32_64.h

Pull x86 updates and fixes from Thomas Gleixner:

 - Fix the (late) fallout from the vector management rework causing
   hlist corruption and irq descriptor reference leaks caused by a
   missing sanity check.

   The straight forward fix triggered another long standing issue to
   surface. The pre rework code hid the issue due to being way slower,
   but now the chance that user space sees an EBUSY error return when
   updating irq affinities is way higher, though quite a bunch of
   userspace tools do not handle it properly despite the fact that EBUSY
   could be returned for at least 10 years.

   It turned out that the EBUSY return can be avoided completely by
   utilizing the existing delayed affinity update mechanism for irq
   remapped scenarios as well. That's a bit more error handling in the
   kernel, but avoids fruitless fingerpointing discussions with tool
   developers.

 - Decouple PHYSICAL_MASK from AMD SME as its going to be required for
   the upcoming Intel memory encryption support as well.

 - Handle legacy device ACPI detection properly for newer platforms

 - Fix the wrong argument ordering in the vector allocation tracepoint

 - Simplify the IDT setup code for the APIC=n case

 - Use the proper string helpers in the MTRR code

 - Remove a stale unused VDSO source file

 - Convert the microcode update lock to a raw spinlock as its used in
   atomic context.

* 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/intel_rdt: Enable CMT and MBM on new Skylake stepping
  x86/apic/vector: Print APIC control bits in debugfs
  genirq/affinity: Defer affinity setting if irq chip is busy
  x86/platform/uv: Use apic_ack_irq()
  x86/ioapic: Use apic_ack_irq()
  irq_remapping: Use apic_ack_irq()
  x86/apic: Provide apic_ack_irq()
  genirq/migration: Avoid out of line call if pending is not set
  genirq/generic_pending: Do not lose pending affinity update
  x86/apic/vector: Prevent hlist corruption and leaks
  x86/vector: Fix the args of vector_alloc tracepoint
  x86/idt: Simplify the idt_setup_apic_and_irq_gates()
  x86/platform/uv: Remove extra parentheses
  x86/mm: Decouple dynamic __PHYSICAL_MASK from AMD SME
  x86: Mark native_set_p4d() as __always_inline
  x86/microcode: Make the late update update_lock a raw lock for RT
  x86/mtrr: Convert to use strncpy_from_user() helper
  x86/mtrr: Convert to use match_string() helper
  x86/vdso: Remove unused file
  x86/i8237: Register device based on FADT legacy boot flag

Pull x86 pti updates from Thomas Gleixner:
 "Three small commits updating the SSB mitigation to take the updated
  AMD mitigation variants into account"

* 'x86-pti-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/bugs: Switch the selection of mitigation from CPU vendor to CPU features
  x86/bugs: Add AMD's SPEC_CTRL MSR usage
  x86/bugs: Add AMD's variant of SSB_NO

Pull more perf tooling updates from Thomas Gleixner:
 "Perf tool updates and fixes:

  perf stat:

   - Display user and system time for workload targets (Jiri Olsa)

  perf record:

   - Enable arbitrary event names thru name= modifier (Alexey Budankov)

  PowerPC:

   - Add a python script for hypervisor call statistics (Ravi Bangoria)

  Intel PT: (Adrian Hunter)

   - Fix sync_switch INTEL_PT_SS_NOT_TRACING

   - Fix decoding to accept CBR between FUP and corresponding TIP

   - Fix MTC timing after overflow

   - Fix "Unexpected indirect branch" error

  perf test:

   - record+probe_libc_inet_pton:
      - To get the symbol table for dynamic shared objects on ubuntu we
        need to pass the -D/--dynamic command line option, unlike with
        the fedora distros (Arnaldo Carvalho de Melo)

   - code-reading:
      - Fix perf_env setup for PTI entry trampolines (Adrian Hunter)

   - kmod-path:
      - Add tests for vdso32 and vdsox32 (Adrian Hunter)

   - Use header file util/debug.h (Thomas Richter)

  perf annotate:

   - Make the various UI backends (stdio, TUI, gtk) use more
     consistently structs with annotation options as specified by the
     user (Arnaldo Carvalho de Melo)

   - Move annotation specific knobs from the symbol_conf global kitchen
     sink to the annotation option structs (Arnaldo Carvalho de Melo)

  perf script:

   - Add more PMU fields to python scripts event handler dict (Jin Yao)

  Core:

   - Fix misleading error for some unparsable events mentioning PMUs
     when those are not involved in the problem (Jiri Olsa)

   - Consider BSS symbols when processing /proc/kallsyms ('B' and 'b')
     (Arnaldo Carvalho de Melo)

   - Be more robust when trying to use per-symbol histograms, checking
     for unlikely but possible cases where the space for the histograms
     wasn't allocated, print a debug message for such cases (Arnaldo
     Carvalho de Melo)

   - Fix symbol and object code resolution for vdso32 and vdsox32
     (Adrian Hunter)

   - No need to check for null when passing pointers to foo__get() style
     refcount grabbing helpers, just like in the kernel and with free(),
     its safe to pass a NULL pointer to avoid having to check it before
     each and every foo__get() call (Arnaldo Carvalho de Melo)

   - Remove some dead code (quote.[ch]) (Arnaldo Carvalho de Melo)

   - Remove some needless globals, making them local (Arnaldo Carvalho
     de Melo)

   - Reduce usage of symbol_conf.use_callchain, using other means of
     finding out if callchains are in use or available for specific
     events, as we evolved this codebase to allow requesting callchains
     for just a subset of the monitored events. In time it will help
     polish recording and showing mixed sets accross the various tools:

        perf record -e cycles/call-graph=fp/,cache-misses/call-graph=dwarf/,instructions'

     (Arnaldo Carvalho de Melo)

   - Consider PTI entry trampolines in map__rip_2objdump() (Adrian
     Hunter)"

* 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (50 commits)
  perf script python: Add dict fields introduction to Documentation
  perf script python: Add more PMU fields to event handler dict
  perf script python: Move dsoname code to a new function
  perf symbols: Add BSS symbols when reading from /proc/kallsyms
  perf annnotate: Make __symbol__inc_addr_samples handle src->histograms == NULL
  perf intel-pt: Fix "Unexpected indirect branch" error
  perf intel-pt: Fix MTC timing after overflow
  perf intel-pt: Fix decoding to accept CBR between FUP and corresponding TIP
  perf intel-pt: Fix sync_switch INTEL_PT_SS_NOT_TRACING
  perf script powerpc: Python script for hypervisor call statistics
  perf test record+probe_libc_inet_pton: Ask 'nm' for dynamic symbols
  perf map: Consider PTI entry trampolines in rip_2objdump()
  perf test code-reading: Fix perf_env setup for PTI entry trampolines
  perf tools: Fix pmu events parsing rule
  perf stat: Display user and system time
  perf record: Enable arbitrary event names thru name= modifier
  perf tools: Fix symbol and object code resolution for vdso32 and vdsox32
  perf tests kmod-path: Add tests for vdso32 and vdsox32
  perf hists: Check if a hist_entry has callchains before using them
  perf hists: Introduce hist_entry__has_callchain() method
  ...

Pull irq fixes from Thomas Gleixner:
 "Two small fixlets:

   - Add the missing iomu mapping call in the Freescale/NXP/Qualcomm/
     whoever owns it now/ SCFG MSI irqchip driver. Otherwise IRQs wont
     work at all.

   - Fix a SMP=n build warning in the STM32 irq chip driver"

* 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/ls-scfg-msi: Map MSIs in the iommu
  irqchip/stm32: Fix non-SMP build warning

Pull core fixes from Thomas Gleixner:
 "A small set of core updates:

   - Make objtool cope with GCC8 oddities some more

   - Remove a stale local_irq_save/restore sequence in the signal code
     along with the stale comment in the RCU code. The underlying issue
     which led to this has been solved long time ago, but nobody cared
     to cleanup the hackarounds"

* 'core-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  signal: Remove no longer required irqsave/restore
  rcu: Update documentation of rcu_read_unlock()
  objtool: Fix GCC 8 cold subfunction detection for aliased functions

Commit a841796f ("signal: align __lock_task_sighand() irq disabling and
RCU") introduced a rcu read side critical section with interrupts
disabled. The changelog suggested that a better long-term fix would be "to
make rt_mutex_unlock() disable irqs when acquiring the rt_mutex structure's
->wait_lock".

This long-term fix has been made in commit b4abf910 ("rtmutex: Make
wait_lock irq safe") for a different reason.

Therefore revert commit a841796f ("signal: align >
__lock_task_sighand() irq disabling and RCU") as the interrupt disable
dance is not longer required.

The change was tested on the base of b4abf910 ("rtmutex: Make wait_lock
irq safe") with a four hour run of rcutorture scenario TREE03 with lockdep
enabled as suggested by Paul McKenney.
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: bigeasy@linutronix.de
Link: https://lkml.kernel.org/r/20180525090507.22248-3-anna-maria@linutronix.de

Since commit b4abf910 ("rtmutex: Make wait_lock irq safe") the
explanation in rcu_read_unlock() documentation about irq unsafe rtmutex
wait_lock is no longer valid.

Remove it to prevent kernel developers reading the documentation to rely on
it.
Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Anna-Maria Gleixner <anna-maria@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: bigeasy@linutronix.de
Link: https://lkml.kernel.org/r/20180525090507.22248-2-anna-maria@linutronix.de

Merge proc_cmdline simplifications.

This re-writes the get_mm_cmdline() logic to be rather simpler than it
used to be, and makes the semantics for "cmdline goes past the end of
the original area" more natural.

You _can_ use prctl(PR_SET_MM) to just point your command line somewhere
else entirely, but the traditional model is to just edit things in place
and that still needs to continue to work.  At least this way the code
makes some sense.

* proc-cmdline:
  fs/proc: simplify and clarify get_mm_cmdline() function
  fs/proc: re-factor proc_pid_cmdline_read() a bit

Use the error code EUCLEAN for filesystem errors because other
filesystems use this code too.

[ And remove unused EMEMERROR  - Linus ]
Signed-off-by: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

Pull power supply and reset updates from Sebastian Reichel:
 - bq27xxx: Add BQ27426 support
 - ab8500: Drop AB8540/9540 support
 - Introduced new usb_type property
 - Properly document the power-supply ABI
 - misc. cleanups and fixes

* tag 'for-v4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-power-supply:
  MAINTAINERS: add entry for LEGO MINDSTORMS EV3
  power: supply: ab8500_charger: fix spelling mistake: "faile" -> "failed"
  power: supply: axp288_fuel_gauge: Remove polling from the driver
  power: supply: axp288_fuelguage: Do not bind when the fg function is not used
  power: supply: axp288_charger: Do not bind when the charge function is not used
  power: supply: axp288_charger: Support 3500 and 4000 mA input current limit
  power: supply: s3c-adc-battery: fix driver data initialization
  power: supply: charger-manager: Verify polling interval only when polling requested
  power: supply: sysfs: Use enum to specify property
  power: supply: ab8500: Drop AB8540/9540 support
  power: supply: ab8500_fg: fix spelling mistake: "Disharge" -> "Discharge"
  power: supply: simplify getting .drvdata
  power: supply: bq27xxx: Add support for BQ27426
  gpio-poweroff: Use gpiod_set_value_cansleep

Pull HSI update from Sebastian Reichel:
 "Just one patch for the HSI subsystem this time: use the new vm_fault_t
  return type"

* tag 'hsi-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/sre/linux-hsi:
  hsi: clients: Change return type to vm_fault_t

Pull clk updates from Stephen Boyd:
 "This time we have a good set of changes to the core framework that do
  some general cleanups, but nothing too major. The majority of the diff
  goes to two SoCs, Actions Semi and Qualcomm. A brand new driver is
  introduced for Actions Semi so it takes up some lines to add all the
  different types, and the Qualcomm diff is there because we add support
  for two SoCs and it's quite a bit of data.

  Otherwise the big driver updates are on TI Davinci and Amlogic
  platforms. And then the long tail of driver updates for various fixes
  and stuff follows after that.

  Core:
   - debugfs cleanups removing error checking and an unused provider API
   - Removal of a clk init typedef that isn't used
   - Usage of match_string() to simplify parent string name matching
   - OF clk helpers moved to their own file (linux/of_clk.h)
   - Make clk warnings more readable across kernel versions

  New Drivers:
   - Qualcomm SDM845 GCC and Video clk controllers
   - Qualcomm MSM8998 GCC
   - Actions Semi S900 SoC support
   - Nuvoton npcm750 microcontroller clks
   - Amlogic axg AO clock controller

  Removed Drivers:
   - Deprecated Rockchip clk-gate driver

  Updates:
   - debugfs functions stopped checking return values
   - Support for the MSIOF module clocks on Rensas R-Car M3-N
   - Support for the new Rensas RZ/G1C and R-Car E3 SoCs
   - Qualcomm GDSC, RCG, and PLL updates for clk changes in new SoCs
   - Berlin and Amlogic SPDX tagging
   - Usage of of_clk_get_parent_count() in more places
   - Proper implementation of the CDEV1/2 clocks on Tegra20
   - Allwinner H6 PRCM clock support and R40 EMAC support
   - Add critical flag to meson8b's fdiv2 as temporary fixup for ethernet
   - Round closest support for meson's mpll driver
   - Support for meson8b nand clocks and gxbb video decoder clocks
   - Mediatek mali clks
   - STM32MP1 fixes
   - Uniphier LD11/LD20 stream demux system clock"

* tag 'clk-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux: (134 commits)
  clk: qcom: Export clk_fabia_pll_configure()
  clk: bcm: Update and add Stingray clock entries
  dt-bindings: clk: Update Stingray binding doc
  clk-si544: Properly round requested frequency to nearest match
  clk: ingenic: jz4770: Add 150us delay after enabling VPU clock
  clk: ingenic: jz4770: Enable power of AHB1 bus after ungating VPU clock
  clk: ingenic: jz4770: Modify C1CLK clock to disable CPU clock stop on idle
  clk: ingenic: jz4770: Change OTG from custom to standard gated clock
  clk: ingenic: Support specifying "wait for clock stable" delay
  clk: ingenic: Add support for clocks whose gate bit is inverted
  clk: use match_string() helper
  clk: bcm2835: use match_string() helper
  clk: Return void from debug_init op
  clk: remove clk_debugfs_add_file()
  clk: tegra: no need to check return value of debugfs_create functions
  clk: davinci: no need to check return value of debugfs_create functions
  clk: bcm2835: no need to check return value of debugfs_create functions
  clk: no need to check return value of debugfs_create functions
  clk: imx6: add EPIT clock support
  clk: mvebu: use correct bit for 98DX3236 NAND
  ...

Pull MD updates from Shaohua Li:
 "A few fixes of MD for this merge window. Mostly bug fixes:

   - raid5 stripe batch fix from Amy

   - Read error handling for raid1 FailFast device from Gioh

   - raid10 recovery NULL pointer dereference fix from Guoqing

   - Support write hint for raid5 stripe cache from Mariusz

   - Fixes for device hot add/remove from Neil and Yufen

   - Improve flush bio scalability from Xiao"

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/shli/md:
  MD: fix lock contention for flush bios
  md/raid5: Assigning NULL to sh->batch_head before testing bit R5_Overlap of a stripe
  md/raid1: add error handling of read error from FailFast device
  md: fix NULL dereference of mddev->pers in remove_and_add_spares()
  raid5: copy write hint from origin bio to stripe
  md: fix two problems with setting the "re-add" device state.
  raid10: check bio in r10buf_pool_free to void NULL pointer dereference
  md: fix an error code format and remove unsed bio_sector

Pull sparc updates from David Miller:

 - a FPE signal fix that was also merged upstream

 - privileged ADI driver from Tom Hromatka

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
  sparc: fix compat siginfo ABI regression
  selftests: sparc64: char: Selftest for privileged ADI driver
  char: sparc64: Add privileged ADI driver

Pull IDE updates from David Miller:
 "Primarily IRQ disabling avoidance changes from Sebastian Andrzej
  Siewior"

* git://git.kernel.org/pub/scm/linux/kernel/git/davem/ide:
  ide: don't enable/disable interrupts in force threaded-IRQ mode
  ide: don't disable interrupts during kmap_atomic()
  ide: Handle irq disabling consistently
  alim15x3: move irq-restore before pci_dev_put()

Pull staging/IIO updates from Greg KH:
 "Here is the big staging and IIO driver update for 4.18-rc1.

  It was delayed as I wanted to make sure the final driver deletions did
  not cause any major merge issues, and all now looks good.

  There are a lot of patches here, just over 1000. The diffstat summary
  shows the major changes here:

	1007 files changed, 16828 insertions(+), 227770 deletions(-)

  Because of this, we might be close to shrinking the overall kernel
  source code size for two releases in a row.

  There was loads of work in this release cycle, primarily:

   - tons of ks7010 driver cleanups

   - lots of mt7621 driver fixes and cleanups

   - most driver cleanups

   - wilc1000 fixes and cleanups

   - lots and lots of IIO driver cleanups and new additions

   - debugfs cleanups for all staging drivers

   - lots of other staging driver cleanups and fixes, the shortlog has
     the full details.

  but the big user-visable things here are the removal of 3 chunks of
  code:

   - ncpfs and ipx were removed on schedule, no one has cared about this
     code since it moved to staging last year, and if it needs to come
     back, it can be reverted.

   - lustre file system is removed.

     I've ranted at the lustre developers about once a year for the past
     5 years, with no real forward progress at all to clean things up
     and get the code into the "real" part of the kernel.

     Given that the lustre developers continue to work on an external
     tree and try to port those changes to the in-kernel tree every once
     in a while, this whole thing really really is not working out at
     all. So I'm deleting it so that the developers can spend the time
     working in their out-of-tree location and get things cleaned up
     properly to get merged into the tree correctly at a later date.

  Because of these file removals, you will have merge issues on some of
  these files (2 in the ipx code, 1 in the ncpfs code, and 1 in the
  atomisp driver). Just delete those files, it's a simple merge :)

  All of this has been in linux-next for a while with no reported
  problems"

* tag 'staging-4.18-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging: (1011 commits)
  staging: ipx: delete it from the tree
  ncpfs: remove uapi .h files
  ncpfs: remove Documentation
  ncpfs: remove compat functionality
  staging: ncpfs: delete it
  staging: lustre: delete the filesystem from the tree.
  staging: vc04_services: no need to save the log debufs dentries
  staging: vc04_services: vchiq_debugfs_log_entry can be a void *
  staging: vc04_services: remove struct vchiq_debugfs_info
  staging: vc04_services: move client dbg directory into static variable
  staging: vc04_services: remove odd vchiq_debugfs_top() wrapper
  staging: vc04_services: no need to check debugfs return values
  staging: mt7621-gpio: reorder includes alphabetically
  staging: mt7621-gpio: change gc_map to don't use pointers
  staging: mt7621-gpio: use GPIOF_DIR_OUT and GPIOF_DIR_IN macros instead of custom values
  staging: mt7621-gpio: change 'to_mediatek_gpio' to make just a one line return
  staging: mt7621-gpio: dt-bindings: update documentation for #interrupt-cells property
  staging: mt7621-gpio: update #interrupt-cells for the gpio node
  staging: mt7621-gpio: dt-bindings: complete documentation for the gpio
  staging: mt7621-dts: add missing properties to gpio node
  ...

New stepping of Skylake has fixes for cache occupancy and memory
bandwidth monitoring.

Update the code to enable these by default on newer steppings.
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: stable@vger.kernel.org # v4.14
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Link: https://lkml.kernel.org/r/20180608160732.9842-1-tony.luck@intel.com

A recent commit reused the original request flags for the flush
queue handling. However, for some of the kick flush cases, the
original request was already completed. This caused a use after
free, if blk-mq wasn't used.

Fixes: 84fca1b0 ("block: pass failfast and driver-specific flags to flush requests")
Reported-by: Dmitry Vyukov <dvyukov@google.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

Pull libnvdimm updates from Dan Williams:
 "This adds a user for the new 'bytes-remaining' updates to
  memcpy_mcsafe() that you already received through Ingo via the
  x86-dax- for-linus pull.

  Not included here, but still targeting this cycle, is support for
  handling memory media errors (poison) consumed via userspace dax
  mappings.

  Summary:

   - DAX broke a fundamental assumption of truncate of file mapped
     pages. The truncate path assumed that it is safe to disconnect a
     pinned page from a file and let the filesystem reclaim the physical
     block. With DAX the page is equivalent to the filesystem block.
     Introduce dax_layout_busy_page() to enable filesystems to wait for
     pinned DAX pages to be released. Without this wait a filesystem
     could allocate blocks under active device-DMA to a new file.

   - DAX arranges for the block layer to be bypassed and uses
     dax_direct_access() + copy_to_iter() to satisfy read(2) calls.
     However, the memcpy_mcsafe() facility is available through the pmem
     block driver. In order to safely handle media errors, via the DAX
     block-layer bypass, introduce copy_to_iter_mcsafe().

   - Fix cache management policy relative to the ACPI NFIT Platform
     Capabilities Structure to properly elide cache flushes when they
     are not necessary. The table indicates whether CPU caches are
     power-fail protected. Clarify that a deep flush is always performed
     on REQ_{FUA,PREFLUSH} requests"

* tag 'libnvdimm-for-4.18' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm: (21 commits)
  dax: Use dax_write_cache* helpers
  libnvdimm, pmem: Do not flush power-fail protected CPU caches
  libnvdimm, pmem: Unconditionally deep flush on *sync
  libnvdimm, pmem: Complete REQ_FLUSH => REQ_PREFLUSH
  acpi, nfit: Remove ecc_unit_size
  dax: dax_insert_mapping_entry always succeeds
  libnvdimm, e820: Register all pmem resources
  libnvdimm: Debug probe times
  linvdimm, pmem: Preserve read-only setting for pmem devices
  x86, nfit_test: Add unit test for memcpy_mcsafe()
  pmem: Switch to copy_to_iter_mcsafe()
  dax: Report bytes remaining in dax_iomap_actor()
  dax: Introduce a ->copy_to_iter dax operation
  uio, lib: Fix CONFIG_ARCH_HAS_UACCESS_MCSAFE compilation
  xfs, dax: introduce xfs_break_dax_layouts()
  xfs: prepare xfs_break_layouts() for another layout type
  xfs: prepare xfs_break_layouts() to be called with XFS_MMAPLOCK_EXCL
  mm, fs, dax: handle layout changes to pinned dax mappings
  mm: fix __gup_device_huge vs unmap
  mm: introduce MEMORY_DEVICE_FS_DAX and CONFIG_DEV_PAGEMAP_OPS
  ...

Callers of br_fdb_find() need to hold the hash lock, which
br_fdb_find_port() doesn't do. However, since br_fdb_find_port() is not
doing any actual FDB manipulation, the hash lock is not really needed at
all. So convert to br_fdb_find_rcu(), surrounded by rcu_read_lock() /
_unlock() pair.

The device pointer copied from inside the FDB entry is then kept alive
by the RTNL lock, which br_fdb_find_port() asserts.

Fixes: 4d4fd361 ("net: bridge: Publish bridge accessor functions")
Signed-off-by: Petr Machata <petrm@mellanox.com>
Acked-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

After commit 6b229cf7 ("udp: add batching to udp_rmem_release()")
the sk_rmem_alloc field does not measure exactly anymore the
receive queue length, because we batch the rmem release. The issue
is really apparent only after commit 0d4a6608 ("udp: do rmem bulk
free even if the rx sk queue is empty"): the user space can easily
check for an empty socket with not-0 queue length reported by the 'ss'
tool or the procfs interface.

We need to use a custom UDP helper to report the correct queue length,
taking into account the forward allocation deficit.

Reported-by: trevor.francis@46labs.com
Fixes: 6b229cf7 ("UDP: add batching to udp_rmem_release()")
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

Commit 4a0e3e98 ("cdc_ncm: Add support for moving NDP to end
of NCM frame") added logic to reserve space for the NDP at the
end of the NTB/skb.  This reservation did not take the final
alignment of the NDP into account, causing us to reserve too
little space. Additionally the padding prior to NDP addition did
not ensure there was enough space for the NDP.

The NTB/skb with the NDP appended would then exceed the configured
max size. This caused the final padding of the NTB to use a
negative count, padding to almost INT_MAX, and resulting in:

[60103.825970] BUG: unable to handle kernel paging request at ffff9641f2004000
[60103.825998] IP: __memset+0x24/0x30
[60103.826001] PGD a6a06067 P4D a6a06067 PUD 4f65a063 PMD 72003063 PTE 0
[60103.826013] Oops: 0002 [#1] SMP NOPTI
[60103.826018] Modules linked in: (removed(
[60103.826158] CPU: 0 PID: 5990 Comm: Chrome_DevTools Tainted: G           O 4.14.0-3-amd64 #1 Debian 4.14.17-1
[60103.826162] Hardware name: LENOVO 20081 BIOS 41CN28WW(V2.04) 05/03/2012
[60103.826166] task: ffff964193484fc0 task.stack: ffffb2890137c000
[60103.826171] RIP: 0010:__memset+0x24/0x30
[60103.826174] RSP: 0000:ffff964316c03b68 EFLAGS: 00010216
[60103.826178] RAX: 0000000000000000 RBX: 00000000fffffffd RCX: 000000001ffa5000
[60103.826181] RDX: 0000000000000005 RSI: 0000000000000000 RDI: ffff9641f2003ffc
[60103.826184] RBP: ffff964192f6c800 R08: 00000000304d434e R09: ffff9641f1d2c004
[60103.826187] R10: 0000000000000002 R11: 00000000000005ae R12: ffff9642e6957a80
[60103.826190] R13: ffff964282ff2ee8 R14: 000000000000000d R15: ffff9642e4843900
[60103.826194] FS:  00007f395aaf6700(0000) GS:ffff964316c00000(0000) knlGS:0000000000000000
[60103.826197] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[60103.826200] CR2: ffff9641f2004000 CR3: 0000000013b0c000 CR4: 00000000000006f0
[60103.826204] Call Trace:
[60103.826212]  <IRQ>
[60103.826225]  cdc_ncm_fill_tx_frame+0x5e3/0x740 [cdc_ncm]
[60103.826236]  cdc_ncm_tx_fixup+0x57/0x70 [cdc_ncm]
[60103.826246]  usbnet_start_xmit+0x5d/0x710 [usbnet]
[60103.826254]  ? netif_skb_features+0x119/0x250
[60103.826259]  dev_hard_start_xmit+0xa1/0x200
[60103.826267]  sch_direct_xmit+0xf2/0x1b0
[60103.826273]  __dev_queue_xmit+0x5e3/0x7c0
[60103.826280]  ? ip_finish_output2+0x263/0x3c0
[60103.826284]  ip_finish_output2+0x263/0x3c0
[60103.826289]  ? ip_output+0x6c/0xe0
[60103.826293]  ip_output+0x6c/0xe0
[60103.826298]  ? ip_forward_options+0x1a0/0x1a0
[60103.826303]  tcp_transmit_skb+0x516/0x9b0
[60103.826309]  tcp_write_xmit+0x1aa/0xee0
[60103.826313]  ? sch_direct_xmit+0x71/0x1b0
[60103.826318]  tcp_tasklet_func+0x177/0x180
[60103.826325]  tasklet_action+0x5f/0x110
[60103.826332]  __do_softirq+0xde/0x2b3
[60103.826337]  irq_exit+0xae/0xb0
[60103.826342]  do_IRQ+0x81/0xd0
[60103.826347]  common_interrupt+0x98/0x98
[60103.826351]  </IRQ>
[60103.826355] RIP: 0033:0x7f397bdf2282
[60103.826358] RSP: 002b:00007f395aaf57d8 EFLAGS: 00000206 ORIG_RAX: ffffffffffffff6e
[60103.826362] RAX: 0000000000000000 RBX: 00002f07bc6d0900 RCX: 00007f39752d7fe7
[60103.826365] RDX: 0000000000000022 RSI: 0000000000000147 RDI: 00002f07baea02c0
[60103.826368] RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
[60103.826371] R10: 00000000ffffffff R11: 0000000000000000 R12: 00002f07baea02c0
[60103.826373] R13: 00002f07bba227a0 R14: 00002f07bc6d090c R15: 0000000000000000
[60103.826377] Code: 90 90 90 90 90 90 90 0f 1f 44 00 00 49 89 f9 48 89 d1 83
e2 07 48 c1 e9 03 40 0f b6 f6 48 b8 01 01 01 01 01 01 01 01 48 0f af c6 <f3> 48
ab 89 d1 f3 aa 4c 89 c8 c3 90 49 89 f9 40 88 f0 48 89 d1
[60103.826442] RIP: __memset+0x24/0x30 RSP: ffff964316c03b68
[60103.826444] CR2: ffff9641f2004000

Commit e1069bbf ("net: cdc_ncm: Reduce memory use when kernel
memory low") made this bug much more likely to trigger by reducing
the NTB size under memory pressure.

Link: https://bugs.debian.org/893393Reported-by: Горбешко Богдан <bodqhrohro@gmail.com>
Reported-and-tested-by: Dennis Wassenberg <dennis.wassenberg@secunet.com>
Cc: Enrico Mioso <mrkiko.rs@gmail.com>
Fixes: 4a0e3e98 ("cdc_ncm: Add support for moving NDP to end of NCM frame")
Signed-off-by: Bjørn Mork <bjorn@mork.no>
Signed-off-by: David S. Miller <davem@davemloft.net>

use nla_strlcpy() to avoid copying data beyond the length of TCA_DEF_DATA
netlink attribute, in case it is less than SIMP_MAX_DATA and it does not
end with '\0' character.

v2: fix errors in the commit message, thanks Hangbin Liu

Fixes: fa1b1cff ("net_cls_act: Make act_simple use of netlink policy.")
Signed-off-by: Davide Caratti <dcaratti@redhat.com>
Reviewed-by: Simon Horman <simon.horman@netronome.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

bp->SharedMemAddr is set to NULL while bp->SharedMemSize lesser-or-equal 0,
then memset will trigger null-ptr-deref.

fix it by replacing pci_alloc_consistent with dma_zalloc_coherent.
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: David S. Miller <davem@davemloft.net>