1. 03 Oct, 2016 10 commits
    • Arnd Bergmann's avatar
      net/mlx5e: shut up maybe-uninitialized warning · d0debb76
      Arnd Bergmann authored
      Build-testing this driver with -Wmaybe-uninitialized gives a new false-positive
      warning that I can't really explain:
      
      drivers/net/ethernet/mellanox/mlx5/core/en_tc.c: In function 'mlx5e_configure_flower':
      drivers/net/ethernet/mellanox/mlx5/core/en_tc.c:509:3: error: 'old_attr' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      
      It's obvious from the code that 'old_attr' is initialized whenever 'old'
      is non-NULL here. The warning appears with all versions I tested from gcc-4.7
      through gcc-6.1, and I could not come up with a way to rewrite the function
      in a more readable way that avoids the warning, so I'm adding another
      initialization to shut it up.
      
      Fixes: 8b32580d
      
       ("net/mlx5e: Add TC vlan action for SRIOV offloads")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Acked-by: default avatarOr Gerlitz <ogerlitz@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d0debb76
    • Arnd Bergmann's avatar
      cxgb4: unexport cxgb4_dcb_enabled · 7c70c4f8
      Arnd Bergmann authored
      A recent cleanup marked cxgb4_dcb_enabled as 'static', which is correct, but this ignored
      how the symbol is also exported. In addition, the export can be compiled out when modules
      are disabled, causing a harmless compiler warning in configurations for which it is not
      used at all:
      
      drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:282:12: error: 'cxgb4_dcb_enabled' defined but not used [-Werror=unused-function]
      
      This removes the export and moves the function into the correct #ifdef so we only build
      it when there are users.
      
      Fixes: 50935857
      
       ("cxgb4: mark symbols static where possible")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      7c70c4f8
    • Arnd Bergmann's avatar
      net: rtnl: avoid uninitialized data in IFLA_VF_VLAN_LIST handling · fa34cd94
      Arnd Bergmann authored
      With the newly added support for IFLA_VF_VLAN_LIST netlink messages,
      we get a warning about potential uninitialized variable use in
      the parsing of the user input when enabling the -Wmaybe-uninitialized
      warning:
      
      net/core/rtnetlink.c: In function 'do_setvfinfo':
      net/core/rtnetlink.c:1756:9: error: 'ivvl$' may be used uninitialized in this function [-Werror=maybe-uninitialized]
      
      I have not been able to prove whether it is possible to arrive in
      this code with an empty IFLA_VF_VLAN_LIST block, but if we do,
      then ndo_set_vf_vlan gets called with uninitialized arguments.
      
      This adds an explicit check for an empty list, making it obvious
      to the reader and the compiler that this cannot happen.
      
      Fixes: 79aab093
      
       ("net: Update API for VF vlan protocol 802.1ad support")
      Signed-off-by: default avatarArnd Bergmann <arnd@arndb.de>
      Reviewed-by: default avatarMoshe Shemesh <moshe@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      fa34cd94
    • Paolo Abeni's avatar
      net: pktgen: fix pkt_size · 63d75463
      Paolo Abeni authored
      The commit 879c7220 ("net: pktgen: Observe needed_headroom
      of the device") increased the 'pkt_overhead' field value by
      LL_RESERVED_SPACE.
      As a side effect the generated packet size, computed as:
      
      	/* Eth + IPh + UDPh + mpls */
      	datalen = pkt_dev->cur_pkt_size - 14 - 20 - 8 -
      		  pkt_dev->pkt_overhead;
      
      is decreased by the same value.
      The above changed slightly the behavior of existing pktgen users,
      and made the procfs interface somewhat inconsistent.
      Fix it by restoring the previous pkt_overhead value and using
      LL_RESERVED_SPACE as extralen in skb allocation.
      Also, change pktgen_alloc_skb() to only partially reserve
      the headroom to allow the caller to prefetch from ll header
      start.
      
      v1 -> v2:
       - fixed some typos in the comments
      
      Fixes: 879c7220
      
       ("net: pktgen: Observe needed_headroom of the device")
      Suggested-by: default avatarBen Greear <greearb@candelatech.com>
      Signed-off-by: default avatarPaolo Abeni <pabeni@redhat.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      63d75463
    • Gavin Schenk's avatar
      net: fec: set mac address unconditionally · b82d44d7
      Gavin Schenk authored
      
      
      If the mac address origin is not dt, you can only safely assign a mac
      address after "link up" of the device. If the link is off the clocks are
      disabled and because of issues assigning registers when clocks are off the
      new mac address cannot be written in .ndo_set_mac_address() on some soc's.
      This fix sets the mac address unconditionally in fec_restart(...) and
      ensures consistency between fec registers and the network layer.
      
      Signed-off-by: default avatarGavin Schenk <g.schenk@eckelmann.de>
      Acked-by: default avatarFugang Duan <fugang.duan@nxp.com>
      Acked-by: default avatarUwe Kleine-König <u.kleine-koenig@pengutronix.de>
      Fixes: 9638d19e
      
       ("net: fec: add netif status check before set mac address")
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b82d44d7
    • Baoyou Xie's avatar
      net: ethernet: mediatek: mark symbols static where possible · 3a82e78c
      Baoyou Xie authored
      
      
      We get 2 warnings when building kernel with W=1:
      drivers/net/ethernet/mediatek/mtk_eth_soc.c:2041:5: warning: no previous prototype for 'mtk_get_link_ksettings' [-Wmissing-prototypes]
      drivers/net/ethernet/mediatek/mtk_eth_soc.c:2052:5: warning: no previous prototype for 'mtk_set_link_ksettings' [-Wmissing-prototypes]
      
      In fact, these functions are only used in the file in which they are
      declared and don't need a declaration, but can be made static.
      So this patch marks these functions with 'static'.
      
      Signed-off-by: default avatarBaoyou Xie <baoyou.xie@linaro.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      3a82e78c
    • Baoyou Xie's avatar
      cxgb4: mark cxgb_setup_tc() static · 8efebd6e
      Baoyou Xie authored
      
      
      We get 1 warning when building kernel with W=1:
      drivers/net/ethernet/chelsio/cxgb4/cxgb4_main.c:2715:5: warning: no previous prototype for 'cxgb_setup_tc' [-Wmissing-prototypes]
      
      In fact, this function is only used in the file in which it is
      declared and don't need a declaration, but can be made static.
      so this patch marks this function with 'static'.
      
      Signed-off-by: default avatarBaoyou Xie <baoyou.xie@linaro.org>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8efebd6e
    • Maciej Żenczykowski's avatar
      ipv6 addrconf: remove addrconf_sysctl_hop_limit() · cb9e684e
      Maciej Żenczykowski authored
      
      
      This is an effective no-op in terms of user observable behaviour.
      
      By preventing the overwrite of non-null extra1/extra2 fields
      in addrconf_sysctl() we can enable the use of proc_dointvec_minmax().
      
      This allows us to eliminate the constant min/max (1..255) trampoline
      function that is addrconf_sysctl_hop_limit().
      
      This is nice because it simplifies the code, and allows future
      sysctls with constant min/max limits to also not require trampolines.
      
      We still can't eliminate the trampoline for mtu because it isn't
      actually a constant (it depends on other tunables of the device)
      and thus requires at-write-time logic to enforce range.
      
      Signed-off-by: default avatarMaciej Żenczykowski <maze@google.com>
      Acked-by: default avatarErik Kline <ek@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      cb9e684e
    • Stefan Agner's avatar
      netfilter: bridge: clarify bridge/netfilter message · d4ef9f72
      Stefan Agner authored
      
      
      When using bridge without bridge netfilter enabled the message
      displayed is rather confusing and leads to belive that a deprecated
      feature is in use. Use IS_MODULE to be explicit that the message only
      affects users which use bridge netfilter as module and reword the
      message.
      
      Signed-off-by: default avatarStefan Agner <stefan@agner.ch>
      Acked-by: default avatarFlorian Westphal <fw@strlen.de>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      d4ef9f72
    • David S. Miller's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · b50afd20
      David S. Miller authored
      
      
      Three sets of overlapping changes.  Nothing serious.
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      b50afd20
  2. 02 Oct, 2016 7 commits
    • Linus Torvalds's avatar
      Linux 4.8 · c8d2bc9b
      Linus Torvalds authored
      c8d2bc9b
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm · f76d9c61
      Linus Torvalds authored
      Pull ARM fixes from Russell King:
       "Three relatively small fixes for ARM:
      
         - Roger noticed that dma_max_pfn() was calculating the upper limit
           wrongly, by adding the PFN offset of memory twice.
      
         - A fix from Robin to correct parsing of MPIDR values when the
           address size is larger than one BE32 unit.
      
         - A fix from Srinivas to ensure that we do not rely on the boot
           loader (or previous Linux kernel) setting the translation table
           base register a certain way in the decompressor, which can lead to
           crashes"
      
      * 'fixes' of git://git.armlinux.org.uk/~rmk/linux-arm:
        ARM: 8618/1: decompressor: reset ttbcr fields to use TTBR0 on ARMv7
        ARM: 8617/1: dma: fix dma_max_pfn()
        ARM: 8616/1: dt: Respect property size when parsing CPUs
      f76d9c61
    • Srinivas Ramana's avatar
      ARM: 8618/1: decompressor: reset ttbcr fields to use TTBR0 on ARMv7 · 117e5e9c
      Srinivas Ramana authored
      If the bootloader uses the long descriptor format and jumps to
      kernel decompressor code, TTBCR may not be in a right state.
      Before enabling the MMU, it is required to clear the TTBCR.PD0
      field to use TTBR0 for translation table walks.
      
      The commit dbece458 ("ARM: 7501/1: decompressor:
      reset ttbcr for VMSA ARMv7 cores") does the reset of TTBCR.N, but
      doesn't consider all the bits for the size of TTBCR.N.
      
      Clear TTBCR.PD0 field and reset all the three bits of TTBCR.N to
      indicate the use of TTBR0 and the correct base address width.
      
      Fixes: dbece458
      
       ("ARM: 7501/1: decompressor: reset ttbcr for VMSA ARMv7 cores")
      Acked-by: default avatarRobin Murphy <robin.murphy@arm.com>
      Signed-off-by: default avatarSrinivas Ramana <sramana@codeaurora.org>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      117e5e9c
    • Linus Torvalds's avatar
      Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip · be67d60b
      Linus Torvalds authored
      Pull x86 fixes from Thomas Gleixner:
       "The last regression fixes for 4.8 final:
      
         - Two patches addressing the fallout of the CR4 optimizations which
           caused CR4-less machines to fail.
      
         - Fix the VDSO build on big endian machines
      
         - Take care of FPU initialization if no CPUID is available otherwise
           task struct size ends up being zero
      
         - Fix up context tracking in case load_gs_index fails"
      
      * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
        x86/entry/64: Fix context tracking state warning when load_gs_index fails
        x86/boot: Initialize FPU and X86_FEATURE_ALWAYS even if we don't have CPUID
        x86/vdso: Fix building on big endian host
        x86/boot: Fix another __read_cr4() case on 486
        x86/init: Fix cr4_init_shadow() on CR4-less machines
      be67d60b
    • Linus Torvalds's avatar
      Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus · 66188fb1
      Linus Torvalds authored
      Pull MIPS fixes from Ralf Baechle:
       "Another round of fixes:
      
         - CM: Fix mips_cm_max_vp_width for non-MT kernels on MT systems
         - CPS: Avoid BUG() when offlining pre-r6 CPUs
         - DEC: Avoid gas warnings due to suspicious instruction scheduling by
           manually expanding assembler macros.
         - FTLB: Fix configuration by moving confiuguratoin after probing
         - FTLB: clear execution hazard after changing FTLB enable
         - Highmem: Fix detection of unsupported highmem with cache aliases
         - I6400: Don't touch FTLBP chicken bits
         - microMIPS: Fix BUILD_ROLLBACK_PROLOGUE
         - Malta: Fix IOCU disable switch read for MIPS64
         - Octeon: Fix probing of devices attached to GPIO lines
         - uprobes: Misc small fixes"
      
      * 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus:
        MIPS: CM: Fix mips_cm_max_vp_width for non-MT kernels on MT systems
        MIPS: Fix detection of unsupported highmem with cache aliases
        MIPS: Malta: Fix IOCU disable switch read for MIPS64
        MIPS: Fix BUILD_ROLLBACK_PROLOGUE for microMIPS
        MIPS: clear execution hazard after changing FTLB enable
        MIPS: Configure FTLB after probing TLB sizes from config4
        MIPS: Stop setting I6400 FTLBP
        MIPS: DEC: Avoid la pseudo-instruction in delay slots
        MIPS: Octeon: mark GPIO controller node not populated after IRQ init.
        MIPS: uprobes: fix use of uninitialised variable
        MIPS: uprobes: remove incorrect set_orig_insn
        MIPS: fix uretprobe implementation
        MIPS: smp-cps: Avoid BUG() when offlining pre-r6 CPUs
      66188fb1
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc · 0c7fc30f
      Linus Torvalds authored
      Pull sparc fixes from David Miller:
      
       1) Fix section mismatches in some builds, from Paul Gortmaker.
      
       2) Need to count huge zero page mappings when doing TSB sizing, from
          Mike Kravetz.
      
       3) Fix handing of cpu_possible_mask when nr_cpus module option is
          specified, from Atish Patra.
      
       4) Don't allocate irq stacks until nr_irqs has been processed, also
          from Atish Patra.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/sparc:
        sparc64: Fix non-SMP build.
        sparc64: Fix irq stack bootmem allocation.
        sparc64: Fix cpu_possible_mask if nr_cpus is set
        sparc64 mm: Fix more TSB sizing issues
        sparc64: fix section mismatch in find_numa_latencies_for_group
      0c7fc30f
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net · bb6bbc7c
      Linus Torvalds authored
      Pull networking fixes from David Miller:
      
       1) Fix wrong TCP checksums on MTU probing when checksum offloading is
          disabled, from Douglas Caetano dos Santos.
      
       2) Fix qdisc backlog updates in qfq and sfb schedulers, from Cong Wang.
      
       3) Route lookup flow key protocol value is wrong in ip6gre_xmit_other(),
          fix from Lance Richardson.
      
       4) Scheduling while atomic in multicast routing code of ipv4 and ipv6,
          fix from Nikolay Aleksandrov.
      
       5) Fix packet alignment in fec driver, from Eric Nelson.
      
       6) Fix perf regression in sctp due to struct layout and cache misses,
          from Xin Long.
      
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net:
        sctp: fix the issue sctp_diag uses lock_sock in rcu_read_lock
        sctp: change to check peer prsctp_capable when using prsctp polices
        sctp: remove prsctp_param from sctp_chunk
        sctp: move sent_count to the memory hole in sctp_chunk
        tg3: Avoid NULL pointer dereference in tg3_io_error_detected()
        act_ife: Fix false encoding
        act_ife: Fix external mac header on encode
        VSOCK: Don't dec ack backlog twice for rejected connections
        Revert "net: ethernet: bcmgenet: use phydev from struct net_device"
        net: fec: align IP header in hardware
        net: fec: remove QUIRK_HAS_RACC from i.mx27
        net: fec: remove QUIRK_HAS_RACC from i.mx25
        ipmr, ip6mr: fix scheduling while atomic and a deadlock with ipmr_get_route
        ip6_gre: fix flowi6_proto value in ip6gre_xmit_other()
        tcp: fix a compile error in DBGUNDO()
        tcp: fix wrong checksum calculation on MTU probing
        sch_sfb: keep backlog updated with qlen
        sch_qfq: keep backlog updated with qlen
        can: dev: fix deadlock reported after bus-off
      bb6bbc7c
  3. 01 Oct, 2016 4 commits
  4. 30 Sep, 2016 19 commits
    • Linus Torvalds's avatar
      Merge branch 'akpm' (patches from Andrew) · dbd8805b
      Linus Torvalds authored
      Merge more fixes from Andrew Morton:
       "Three fixes"
      
      * emailed patches from Andrew Morton <akpm@linux-foundation.org>:
        include/linux/property.h: fix typo/compile error
        ocfs2: fix deadlock on mmapped page in ocfs2_write_begin_nolock()
        mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page()
      dbd8805b
    • John Youn's avatar
      include/linux/property.h: fix typo/compile error · 37aa7271
      John Youn authored
      This fixes commit d76eebfa ("include/linux/property.h: fix build
      issues with gcc-4.4.4").
      
      With that commit we get the following compile error when using the
      PROPERTY_ENTRY_INTEGER_ARRAY macro.
      
       include/linux/property.h:201:39: error: `u32_data' undeclared (first
                       use in this function)
        PROPERTY_ENTRY_INTEGER_ARRAY(_name_, u32, _val_)
                                             ^
       include/linux/property.h:193:17: note: in definition of macro
                       `PROPERTY_ENTRY_INTEGER_ARRAY'
        { .pointer = { _type_##_data = _val_ } },  \
                       ^
      
      This needs a '.' to reference the union member.  It seems this was just
      overlooked here since it is done correctly in similar constructs in
      other parts of the original commit.
      
      This fix is in preparation of upcoming commits that will use this macro.
      
      Fixes: commit d76eebfa ("include/linux/property.h: fix build issues with gcc-4.4.4")
      Link: http://lkml.kernel.org/r/2de3b929290d88a723ed829a3e3cbd02044714df.1475114627.git.johnyoun@synopsys.com
      
      
      Signed-off-by: default avatarJohn Youn <johnyoun@synopsys.com>
      Cc: "Rafael J. Wysocki" <rafael.j.wysocki@intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      37aa7271
    • Eric Ren's avatar
      ocfs2: fix deadlock on mmapped page in ocfs2_write_begin_nolock() · c33f0785
      Eric Ren authored
      The testcase "mmaptruncate" of ocfs2-test deadlocks occasionally.
      
      In this testcase, we create a 2*CLUSTER_SIZE file and mmap() on it;
      there are 2 process repeatedly performing the following operations
      respectively: one is doing memset(mmaped_addr + 2*CLUSTER_SIZE - 1, 'a',
      1), while the another is playing ftruncate(fd, 2*CLUSTER_SIZE) and then
      ftruncate(fd, CLUSTER_SIZE) again and again.
      
      This is the backtrace when the deadlock happens:
      
         __wait_on_bit_lock+0x50/0xa0
         __lock_page+0xb7/0xc0
         ocfs2_write_begin_nolock+0x163f/0x1790 [ocfs2]
         ocfs2_page_mkwrite+0x1c7/0x2a0 [ocfs2]
         do_page_mkwrite+0x66/0xc0
         handle_mm_fault+0x685/0x1350
         __do_page_fault+0x1d8/0x4d0
         trace_do_page_fault+0x37/0xf0
         do_async_page_fault+0x19/0x70
         async_page_fault+0x28/0x30
      
      In ocfs2_write_begin_nolock(), we first grab the pages and then allocate
      disk space for this write; ocfs2_try_to_free_truncate_log() will be
      called if -ENOSPC is returned; if we're lucky to get enough clusters,
      which is usually the case, we start over again.
      
      But in ocfs2_free_write_ctxt() the target page isn't unlocked, so we
      will deadlock when trying to grab the target page again.
      
      Also, -ENOMEM might be returned in ocfs2_grab_pages_for_write().
      Another deadlock will happen in __do_page_mkwrite() if
      ocfs2_page_mkwrite() returns non-VM_FAULT_LOCKED, and along with a
      locked target page.
      
      These two errors fail on the same path, so fix them by unlocking the
      target page manually before ocfs2_free_write_ctxt().
      
      Jan Kara helps me clear out the JBD2 part, and suggest the hint for root
      cause.
      
      Changes since v1:
      1. Also put ENOMEM error case into consideration.
      
      Link: http://lkml.kernel.org/r/1474173902-32075-1-git-send-email-zren@suse.com
      
      
      Signed-off-by: default avatarEric Ren <zren@suse.com>
      Reviewed-by: default avatarHe Gang <ghe@suse.com>
      Acked-by: default avatarJoseph Qi <joseph.qi@huawei.com>
      Cc: Mark Fasheh <mfasheh@suse.de>
      Cc: Joel Becker <jlbec@evilplan.org>
      Cc: Junxiao Bi <junxiao.bi@oracle.com>
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      c33f0785
    • Johannes Weiner's avatar
      mm: workingset: fix crash in shadow node shrinker caused by replace_page_cache_page() · 22f2ac51
      Johannes Weiner authored
      Antonio reports the following crash when using fuse under memory pressure:
      
        kernel BUG at /build/linux-a2WvEb/linux-4.4.0/mm/workingset.c:346!
        invalid opcode: 0000 [#1] SMP
        Modules linked in: all of them
        CPU: 2 PID: 63 Comm: kswapd0 Not tainted 4.4.0-36-generic #55-Ubuntu
        Hardware name: System manufacturer System Product Name/P8H67-M PRO, BIOS 3904 04/27/2013
        task: ffff88040cae6040 ti: ffff880407488000 task.ti: ffff880407488000
        RIP: shadow_lru_isolate+0x181/0x190
        Call Trace:
          __list_lru_walk_one.isra.3+0x8f/0x130
          list_lru_walk_one+0x23/0x30
          scan_shadow_nodes+0x34/0x50
          shrink_slab.part.40+0x1ed/0x3d0
          shrink_zone+0x2ca/0x2e0
          kswapd+0x51e/0x990
          kthread+0xd8/0xf0
          ret_from_fork+0x3f/0x70
      
      which corresponds to the following sanity check in the shadow node
      tracking:
      
        BUG_ON(node->count & RADIX_TREE_COUNT_MASK);
      
      The workingset code tracks radix tree nodes that exclusively contain
      shadow entries of evicted pages in them, and this (somewhat obscure)
      line checks whether there are real pages left that would interfere with
      reclaim of the radix tree node under memory pressure.
      
      While discussing ways how fuse might sneak pages into the radix tree
      past the workingset code, Miklos pointed to replace_page_cache_page(),
      and indeed there is a problem there: it properly accounts for the old
      page being removed - __delete_from_page_cache() does that - but then
      does a raw raw radix_tree_insert(), not accounting for the replacement
      page.  Eventually the page count bits in node->count underflow while
      leaving the node incorrectly linked to the shadow node LRU.
      
      To address this, make sure replace_page_cache_page() uses the tracked
      page insertion code, page_cache_tree_insert().  This fixes the page
      accounting and makes sure page-containing nodes are properly unlinked
      from the shadow node LRU again.
      
      Also, make the sanity checks a bit less obscure by using the helpers for
      checking the number of pages and shadows in a radix tree node.
      
      Fixes: 449dd698 ("mm: keep page cache radix tree nodes in check")
      Link: http://lkml.kernel.org/r/20160919155822.29498-1-hannes@cmpxchg.org
      
      
      Signed-off-by: default avatarJohannes Weiner <hannes@cmpxchg.org>
      Reported-by: default avatarAntonio SJ Musumeci <trapexit@spawn.link>
      Debugged-by: default avatarMiklos Szeredi <miklos@szeredi.hu>
      Cc: <stable@vger.kernel.org>	[3.15+]
      Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      22f2ac51
    • Javi Merino's avatar
      MAINTAINERS: Switch to kernel.org email address for Javi Merino · 9a2172a8
      Javi Merino authored
      
      
      Change my email address to my kernel.org account instead of the ARM one.
      
      Signed-off-by: default avatarJavi Merino <javi.merino@arm.com>
      Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
      9a2172a8
    • Wanpeng Li's avatar
      x86/entry/64: Fix context tracking state warning when load_gs_index fails · 2fa5f04f
      Wanpeng Li authored
      
      
      This warning:
      
       WARNING: CPU: 0 PID: 3331 at arch/x86/entry/common.c:45 enter_from_user_mode+0x32/0x50
       CPU: 0 PID: 3331 Comm: ldt_gdt_64 Not tainted 4.8.0-rc7+ #13
       Call Trace:
        dump_stack+0x99/0xd0
        __warn+0xd1/0xf0
        warn_slowpath_null+0x1d/0x20
        enter_from_user_mode+0x32/0x50
        error_entry+0x6d/0xc0
        ? general_protection+0x12/0x30
        ? native_load_gs_index+0xd/0x20
        ? do_set_thread_area+0x19c/0x1f0
        SyS_set_thread_area+0x24/0x30
        do_int80_syscall_32+0x7c/0x220
        entry_INT80_compat+0x38/0x50
      
      ... can be reproduced by running the GS testcase of the ldt_gdt test unit in
      the x86 selftests.
      
      do_int80_syscall_32() will call enter_form_user_mode() to convert context
      tracking state from user state to kernel state. The load_gs_index() call
      can fail with user gsbase, gsbase will be fixed up and proceed if this
      happen.
      
      However, enter_from_user_mode() will be called again in the fixed up path
      though it is context tracking kernel state currently.
      
      This patch fixes it by just fixing up gsbase and telling lockdep that IRQs
      are off once load_gs_index() failed with user gsbase.
      
      Signed-off-by: default avatarWanpeng Li <wanpeng.li@hotmail.com>
      Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Link: http://lkml.kernel.org/r/1475197266-3440-1-git-send-email-wanpeng.li@hotmail.com
      
      
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      2fa5f04f
    • Andy Lutomirski's avatar
      x86/boot: Initialize FPU and X86_FEATURE_ALWAYS even if we don't have CPUID · 05fb3c19
      Andy Lutomirski authored
      
      
      Otherwise arch_task_struct_size == 0 and we die.  While we're at it,
      set X86_FEATURE_ALWAYS, too.
      
      Reported-by: default avatarDavid Saggiorato <david@saggiorato.net>
      Tested-by: default avatarDavid Saggiorato <david@saggiorato.net>
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Borislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Cc: Dave Hansen <dave@sr71.net>
      Cc: Denys Vlasenko <dvlasenk@redhat.com>
      Cc: H. Peter Anvin <hpa@zytor.com>
      Cc: Josh Poimboeuf <jpoimboe@redhat.com>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Cc: Thomas Gleixner <tglx@linutronix.de>
      Cc: stable@vger.kernel.org
      Fixes: aaeb5c01c5b ("x86/fpu, sched: Introduce CONFIG_ARCH_WANTS_DYNAMIC_TASK_STRUCT and use it on x86")
      Link: http://lkml.kernel.org/r/8de723afbf0811071185039f9088733188b606c9.1475103911.git.luto@kernel.org
      
      
      Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
      05fb3c19
    • Segher Boessenkool's avatar
      x86/vdso: Fix building on big endian host · e4aad645
      Segher Boessenkool authored
      We need to call GET_LE to read hdr->e_type.
      
      Fixes: 57f90c3d
      
       ("x86/vdso: Error out if the vDSO isn't a valid DSO")
      Reported-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
      Signed-off-by: default avatarSegher Boessenkool <segher@kernel.crashing.org>
      Acked-by: default avatarAndy Lutomirski <luto@kernel.org>
      Cc: Stephen Rothwell <sfr@canb.auug.org.au>
      Cc: linux-next@vger.kernel.org
      Link: http://lkml.kernel.org/r/20160929193442.GA16617@gate.crashing.org
      
      
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      e4aad645
    • Andy Lutomirski's avatar
      x86/boot: Fix another __read_cr4() case on 486 · 192d1dcc
      Andy Lutomirski authored
      The condition for reading CR4 was wrong: there are some CPUs with
      CPUID but not CR4.  Rather than trying to make the condition exact,
      use __read_cr4_safe().
      
      Fixes: 18bc7bd5
      
       ("x86/boot: Synchronize trampoline_cr4_features and mmu_cr4_features directly")
      Reported-by: default avatar <david@saggiorato.net>
      Signed-off-by: default avatarAndy Lutomirski <luto@kernel.org>
      Reviewed-by: default avatarBorislav Petkov <bp@alien8.de>
      Cc: Brian Gerst <brgerst@gmail.com>
      Link: http://lkml.kernel.org/r/8c453a61c4f44ab6ff43c29780ba04835234d2e5.1475178369.git.luto@kernel.org
      
      
      Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
      192d1dcc
    • Calvin Owens's avatar
      mlx5: Add ndo_poll_controller() implementation · 80378384
      Calvin Owens authored
      
      
      This implements ndo_poll_controller in net_device_ops callbacks for mlx5,
      which is necessary to use netconsole with this driver.
      
      Acked-By: default avatarSaeed Mahameed <saeedm@mellanox.com>
      Signed-off-by: default avatarCalvin Owens <calvinowens@fb.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      80378384
    • Jakub Kicinski's avatar
      nfp: bpf: zero extend 4 byte context loads · 6cd80b55
      Jakub Kicinski authored
      
      
      Set upper 32 bits of destination register to zeros after
      load from the context structure.
      
      Signed-off-by: default avatarJakub Kicinski <jakub.kicinski@netronome.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      6cd80b55
    • Xin Long's avatar
      sctp: fix the issue sctp_diag uses lock_sock in rcu_read_lock · 1cceda78
      Xin Long authored
      When sctp dumps all the ep->assocs, it needs to lock_sock first,
      but now it locks sock in rcu_read_lock, and lock_sock may sleep,
      which would break rcu_read_lock.
      
      This patch is to get and hold one sock when traversing the list.
      After that and get out of rcu_read_lock, lock and dump it. Then
      it will traverse the list again to get the next one until all
      sctp socks are dumped.
      
      For sctp_diag_dump_one, it fixes this issue by holding asoc and
      moving cb() out of rcu_read_lock in sctp_transport_lookup_process.
      
      Fixes: 8f840e47
      
       ("sctp: add the sctp_diag.c file")
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      1cceda78
    • David S. Miller's avatar
      Merge branch 'sctp-fixes' · 75b005b9
      David S. Miller authored
      
      
      Xin Long says:
      
      ====================
      sctp: a bunch of fixes for prsctp polices
      
      This patchset is to fix 2 issues for prsctp polices:
      
        1. patch 1 and 2 fix "netperf-Throughput_Mbps -37.2% regression" issue
           when overloading the CPU.
      
        2. patch 3 fix "prsctp polices should check both sides' prsctp_capable,
           instead of only local side".
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      75b005b9
    • Xin Long's avatar
      sctp: change to check peer prsctp_capable when using prsctp polices · be4947bf
      Xin Long authored
      Now before using prsctp polices, sctp uses asoc->prsctp_enable to
      check if prsctp is enabled. However asoc->prsctp_enable is set only
      means local host support prsctp, sctp should not abandon packet if
      peer host doesn't enable prsctp.
      
      So this patch is to use asoc->peer.prsctp_capable to check if prsctp
      is enabled on both side, instead of asoc->prsctp_enable, as asoc's
      peer.prsctp_capable is set only when local and peer both enable prsctp.
      
      Fixes: a6c2f792
      
       ("sctp: implement prsctp TTL policy")
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      be4947bf
    • Xin Long's avatar
      sctp: remove prsctp_param from sctp_chunk · 0605483f
      Xin Long authored
      Now sctp uses chunk->prsctp_param to save the prsctp param for all the
      prsctp polices, we didn't need to introduce prsctp_param to sctp_chunk.
      We can just use chunk->sinfo.sinfo_timetolive for RTX and BUF polices,
      and reuse msg->expires_at for TTL policy, as the prsctp polices and old
      expires policy are mutual exclusive.
      
      This patch is to remove prsctp_param from sctp_chunk, and reuse msg's
      expires_at for TTL and chunk's sinfo.sinfo_timetolive for RTX and BUF
      polices.
      
      Note that sctp can't use chunk's sinfo.sinfo_timetolive for TTL policy,
      as it needs a u64 variables to save the expires_at time.
      
      This one also fixes the "netperf-Throughput_Mbps -37.2% regression"
      issue.
      
      Fixes: a6c2f792
      
       ("sctp: implement prsctp TTL policy")
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0605483f
    • Xin Long's avatar
      sctp: move sent_count to the memory hole in sctp_chunk · 73dca124
      Xin Long authored
      Now pahole sctp_chunk, it has 2 memory holes:
         struct sctp_chunk {
      	struct list_head           list;
      	atomic_t                   refcnt;
      	/* XXX 4 bytes hole, try to pack */
      	...
      	long unsigned int          prsctp_param;
      	int                        sent_count;
      	/* XXX 4 bytes hole, try to pack */
      
      This patch is to move up sent_count to fill the 1st one and eliminate
      the 2nd one.
      
      It's not just another struct compaction, it also fixes the "netperf-
      Throughput_Mbps -37.2% regression" issue when overloading the CPU.
      
      Fixes: a6c2f792
      
       ("sctp: implement prsctp TTL policy")
      Signed-off-by: default avatarXin Long <lucien.xin@gmail.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      73dca124
    • David Decotigny's avatar
      mlx4: remove unused fields · 5038056e
      David Decotigny authored
      
      
      This also can address following UBSAN warnings:
      [   36.640343] ================================================================================
      [   36.648772] UBSAN: Undefined behaviour in drivers/net/ethernet/mellanox/mlx4/fw.c:857:26
      [   36.656853] shift exponent 64 is too large for 32-bit type 'int'
      [   36.663348] ================================================================================
      [   36.671783] ================================================================================
      [   36.680213] UBSAN: Undefined behaviour in drivers/net/ethernet/mellanox/mlx4/fw.c:861:27
      [   36.688297] shift exponent 35 is too large for 32-bit type 'int'
      [   36.694702] ================================================================================
      
      Tested:
        reboot with UBSAN, no warning.
      
      Signed-off-by: default avatarDavid Decotigny <decot@googlers.com>
      Acked-by: default avatarEric Dumazet <edumazet@google.com>
      Reviewed-by: default avatarTariq Toukan <tariqt@mellanox.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      5038056e
    • Maciej Żenczykowski's avatar
      ipv6 addrconf: implement RFC7559 router solicitation backoff · bd11f074
      Maciej Żenczykowski authored
      This implements:
        https://tools.ietf.org/html/rfc7559
      
      Backoff is performed according to RFC3315 section 14:
        https://tools.ietf.org/html/rfc3315#section-14
      
      
      
      We allow setting /proc/sys/net/ipv6/conf/*/router_solicitations
      to a negative value meaning an unlimited number of retransmits,
      and we make this the new default (inline with the RFC).
      
      We also add a new setting:
        /proc/sys/net/ipv6/conf/*/router_solicitation_max_interval
      defaulting to 1 hour (per RFC recommendation).
      
      Signed-off-by: default avatarMaciej Żenczykowski <maze@google.com>
      Acked-by: default avatarErik Kline <ek@google.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bd11f074
    • David S. Miller's avatar
      Merge branch 'net_proc_perf' · bcdc6efa
      David S. Miller authored
      Jia He says:
      
      ====================
      Reduce cache miss for snmp_fold_field
      
      In a PowerPc server with large cpu number(160), besides commit
      a3a77372
      
       ("net: Optimize snmp stat aggregation by walking all
      the percpu data at once"), I watched several other snmp_fold_field
      callsites which would cause high cache miss rate.
      
      test source code:
      ================
      My simple test case, which read from the procfs items endlessly:
      /***********************************************************/
      int main(int argc, char **argv)
      {
              int i;
              int fd = -1 ;
              int rdsize = 0;
              char buf[LINELEN+1];
      
              buf[LINELEN] = 0;
              memset(buf,0,LINELEN);
      
              if(1 >= argc) {
                      printf("file name empty\n");
                      return -1;
              }
      
              fd = open(argv[1], O_RDWR, 0644);
              if(0 > fd){
                      printf("open error\n");
                      return -2;
              }
      
              for(i=0;i<0xffffffff;i++) {
                      while(0 < (rdsize = read(fd,buf,LINELEN))){
                              //nothing here
                      }
      
                      lseek(fd, 0, SEEK_SET);
              }
      
              close(fd);
              return 0;
      }
      /**********************************************************/
      
      compile and run:
      ================
      gcc test.c -o test
      
      perf stat -d -e cache-misses ./test /proc/net/snmp
      perf stat -d -e cache-misses ./test /proc/net/snmp6
      perf stat -d -e cache-misses ./test /proc/net/sctp/snmp
      perf stat -d -e cache-misses ./test /proc/net/xfrm_stat
      
      before the patch set:
      ====================
       Performance counter stats for 'system wide':
      
               355911097      cache-misses                                                 [40.08%]
              2356829300      L1-dcache-loads                                              [60.04%]
               355642645      L1-dcache-load-misses     #   15.09% of all L1-dcache hits   [60.02%]
               346544541      LLC-loads                                                    [59.97%]
                  389763      LLC-load-misses           #    0.11% of all LL-cache hits    [40.02%]
      
             6.245162638 seconds time elapsed
      
      After the patch set:
      ===================
       Performance counter stats for 'system wide':
      
               194992476      cache-misses                                                 [40.03%]
              6718051877      L1-dcache-loads                                              [60.07%]
               194871921      L1-dcache-load-misses     #    2.90% of all L1-dcache hits   [60.11%]
               187632232      LLC-loads                                                    [60.04%]
                  464466      LLC-load-misses           #    0.25% of all LL-cache hits    [39.89%]
      
             6.868422769 seconds time elapsed
      The cache-miss rate can be reduced from 15% to 2.9%
      
      changelog
      =========
      v6:
      - correct v5
      v5:
      - order local variables from longest to shortest line
      v4:
      - move memset into one block of if statement in snmp6_seq_show_item
      - remove the changes in netstat_seq_show considerred the stack usage is too large
      v3:
      - introduce generic interface (suggested by Marcelo Ricardo Leitner)
      - use max_t instead of self defined macro (suggested by David Miller)
      v2:
      - fix bug in udplite statistics.
      - snmp_seq_show is split into 2 parts
      ====================
      
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      bcdc6efa