1. 09 May, 2010 1 commit
  2. 08 May, 2010 2 commits
  3. 07 May, 2010 3 commits
  4. 06 May, 2010 5 commits
    • Paul E. McKenney's avatar
      sched: correctly place paranioa memory barriers in synchronize_sched_expedited() · cc631fb7
      Paul E. McKenney authored
      
      
      The memory barriers must be in the SMP case, not in the !SMP case.
      Also add a barrier after the atomic_inc() in order to ensure that
      other CPUs see post-synchronize_sched_expedited() actions as following
      the expedited grace period.
      Signed-off-by: default avatarPaul E. McKenney <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      cc631fb7
    • Tejun Heo's avatar
      sched: kill paranoia check in synchronize_sched_expedited() · 94458d5e
      Tejun Heo authored
      
      
      The paranoid check which verifies that the cpu_stop callback is
      actually called on all online cpus is completely superflous.  It's
      guaranteed by cpu_stop facility and if it didn't work as advertised
      other things would go horribly wrong and trying to recover using
      synchronize_sched() wouldn't be very meaningful.
      
      Kill the paranoid check.  Removal of this feature is done as a
      separate step so that it can serve as a bisection point if something
      actually goes wrong.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Dipankar Sarma <dipankar@in.ibm.com>
      Cc: Josh Triplett <josh@freedesktop.org>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      94458d5e
    • Tejun Heo's avatar
      sched: replace migration_thread with cpu_stop · 969c7921
      Tejun Heo authored
      
      
      Currently migration_thread is serving three purposes - migration
      pusher, context to execute active_load_balance() and forced context
      switcher for expedited RCU synchronize_sched.  All three roles are
      hardcoded into migration_thread() and determining which job is
      scheduled is slightly messy.
      
      This patch kills migration_thread and replaces all three uses with
      cpu_stop.  The three different roles of migration_thread() are
      splitted into three separate cpu_stop callbacks -
      migration_cpu_stop(), active_load_balance_cpu_stop() and
      synchronize_sched_expedited_cpu_stop() - and each use case now simply
      asks cpu_stop to execute the callback as necessary.
      
      synchronize_sched_expedited() was implemented with private
      preallocated resources and custom multi-cpu queueing and waiting
      logic, both of which are provided by cpu_stop.
      synchronize_sched_expedited_count is made atomic and all other shared
      resources along with the mutex are dropped.
      
      synchronize_sched_expedited() also implemented a check to detect cases
      where not all the callback got executed on their assigned cpus and
      fall back to synchronize_sched().  If called with cpu hotplug blocked,
      cpu_stop already guarantees that and the condition cannot happen;
      otherwise, stop_machine() would break.  However, this patch preserves
      the paranoid check using a cpumask to record on which cpus the stopper
      ran so that it can serve as a bisection point if something actually
      goes wrong theree.
      
      Because the internal execution state is no longer visible,
      rcu_expedited_torture_stats() is removed.
      
      This patch also renames cpu_stop threads to from "stopper/%d" to
      "migration/%d".  The names of these threads ultimately don't matter
      and there's no reason to make unnecessary userland visible changes.
      
      With this patch applied, stop_machine() and sched now share the same
      resources.  stop_machine() is faster without wasting any resources and
      sched migration users are much cleaner.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Ingo Molnar <mingo@elte.hu>
      Cc: Dipankar Sarma <dipankar@in.ibm.com>
      Cc: Josh Triplett <josh@freedesktop.org>
      Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      969c7921
    • Tejun Heo's avatar
      stop_machine: reimplement using cpu_stop · 3fc1f1e2
      Tejun Heo authored
      
      
      Reimplement stop_machine using cpu_stop.  As cpu stoppers are
      guaranteed to be available for all online cpus,
      stop_machine_create/destroy() are no longer necessary and removed.
      
      With resource management and synchronization handled by cpu_stop, the
      new implementation is much simpler.  Asking the cpu_stop to execute
      the stop_cpu() state machine on all online cpus with cpu hotplug
      disabled is enough.
      
      stop_machine itself doesn't need to manage any global resources
      anymore, so all per-instance information is rolled into struct
      stop_machine_data and the mutex and all static data variables are
      removed.
      
      The previous implementation created and destroyed RT workqueues as
      necessary which made stop_machine() calls highly expensive on very
      large machines.  According to Dimitri Sivanich, preventing the dynamic
      creation/destruction makes booting faster more than twice on very
      large machines.  cpu_stop resources are preallocated for all online
      cpus and should have the same effect.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarRusty Russell <rusty@rustcorp.com.au>
      Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      3fc1f1e2
    • Tejun Heo's avatar
      cpu_stop: implement stop_cpu[s]() · 1142d810
      Tejun Heo authored
      
      
      Implement a simplistic per-cpu maximum priority cpu monopolization
      mechanism.  A non-sleeping callback can be scheduled to run on one or
      multiple cpus with maximum priority monopolozing those cpus.  This is
      primarily to replace and unify RT workqueue usage in stop_machine and
      scheduler migration_thread which currently is serving multiple
      purposes.
      
      Four functions are provided - stop_one_cpu(), stop_one_cpu_nowait(),
      stop_cpus() and try_stop_cpus().
      
      This is to allow clean sharing of resources among stop_cpu and all the
      migration thread users.  One stopper thread per cpu is created which
      is currently named "stopper/CPU".  This will eventually replace the
      migration thread and take on its name.
      
      * This facility was originally named cpuhog and lived in separate
        files but Peter Zijlstra nacked the name and thus got renamed to
        cpu_stop and moved into stop_machine.c.
      
      * Better reporting of preemption leak as per Peter's suggestion.
      Signed-off-by: default avatarTejun Heo <tj@kernel.org>
      Acked-by: default avatarPeter Zijlstra <peterz@infradead.org>
      Cc: Oleg Nesterov <oleg@redhat.com>
      Cc: Dimitri Sivanich <sivanich@sgi.com>
      1142d810
  5. 30 Apr, 2010 7 commits
  6. 29 Apr, 2010 10 commits
  7. 28 Apr, 2010 12 commits
    • Colin Tuckley's avatar
      ARM: 5957/1: ARM: RealView SD/MMC Card detection and write-protect using GPIOLIB · b56ba8aa
      Colin Tuckley authored
      
      
      The switch to using GPIOLIB broke the sd/mmc card detection on the
      RealView development boards if GPIO_PL061 was not selected.
      This patch selects GPIO_PL061 if GPIOLIB is selected.
      The sense of the return value from mmc_status has also changed
      and is corrected.
      Signed-off-by: default avatarColin Tuckley <colin.tuckley@arm.com>
      Acked-by: default avatarCatalin Marinas <catalin.marinas@arm.com>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      b56ba8aa
    • Linus Torvalds's avatar
      1d16b0f2
    • Linus Torvalds's avatar
      Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6 · 032b734d
      Linus Torvalds authored
      * git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6: (27 commits)
        sfc: Change falcon_probe_board() to fail for unsupported boards
        sfc: Always close net device at the end of a disabling reset
        sfc: Wait at most 10ms for the MC to finish reading out MAC statistics
        sctp: Fix oops when sending queued ASCONF chunks
        sctp: fix to calc the INIT/INIT-ACK chunk length correctly is set
        sctp: per_cpu variables should be in bh_disabled section
        sctp: fix potential reference of a freed pointer
        sctp: avoid irq lock inversion while call sk->sk_data_ready()
        Revert "tcp: bind() fix when many ports are bound"
        net/usb: add sierra_net.c driver
        cdc_ether: fix autosuspend for mbm devices
        bluetooth: handle l2cap_create_connless_pdu() errors
        gianfar: Wait for both RX and TX to stop
        ipheth: potential null dereferences on error path
        smc91c92_cs: spin_unlock_irqrestore before calling smc_interrupt()
        drivers/usb/net/kaweth.c: add device "Allied Telesyn AT-USB10 USB Ethernet Adapter"
        bnx2: Update version to 2.0.9.
        bnx2: Prevent "scheduling while atomic" warning with cnic, bonding and vlan.
        bnx2: Fix lost MSI-X problem on 5709 NICs.
        cxgb3: Wait longer for control packets on initialization
        ...
      032b734d
    • Ben Hutchings's avatar
      sfc: Change falcon_probe_board() to fail for unsupported boards · e41c11ee
      Ben Hutchings authored
      
      
      The driver needs specific PHY and board support code for each SFC4000
      board; there is no point trying to continue if it is missing.
      Currently unsupported boards can trigger an 'oops'.
      Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      e41c11ee
    • Ben Hutchings's avatar
      sfc: Always close net device at the end of a disabling reset · f49a4589
      Ben Hutchings authored
      This fixes a regression introduced by commit
      eb9f6744
      
       "sfc: Implement ethtool
      reset operation".
      Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      f49a4589
    • Ben Hutchings's avatar
      sfc: Wait at most 10ms for the MC to finish reading out MAC statistics · aabc5649
      Ben Hutchings authored
      
      
      The original code would wait indefinitely if MAC stats DMA failed.
      Signed-off-by: default avatarBen Hutchings <bhutchings@solarflare.com>
      Cc: stable@kernel.org
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      aabc5649
    • Vlad Yasevich's avatar
      sctp: Fix oops when sending queued ASCONF chunks · c0786693
      Vlad Yasevich authored
      
      
      When we finish processing ASCONF_ACK chunk, we try to send
      the next queued ASCONF.  This action runs the sctp state
      machine recursively and it's not prepared to do so.
      
      kernel BUG at kernel/timer.c:790!
      invalid opcode: 0000 [#1] SMP
      last sysfs file: /sys/module/ipv6/initstate
      Modules linked in: sha256_generic sctp libcrc32c ipv6 dm_multipath
      uinput 8139too i2c_piix4 8139cp mii i2c_core pcspkr virtio_net joydev
      floppy virtio_blk virtio_pci [last unloaded: scsi_wait_scan]
      
      Pid: 0, comm: swapper Not tainted 2.6.34-rc4 #15 /Bochs
      EIP: 0060:[<c044a2ef>] EFLAGS: 00010286 CPU: 0
      EIP is at add_timer+0xd/0x1b
      EAX: cecbab14 EBX: 000000f0 ECX: c0957b1c EDX: 03595cf4
      ESI: cecba800 EDI: cf276f00 EBP: c0957aa0 ESP: c0957aa0
       DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
      Process swapper (pid: 0, ti=c0956000 task=c0988ba0 task.ti=c0956000)
      Stack:
       c0957ae0 d1851214 c0ab62e4 c0ab5f26 0500ffff 00000004 00000005 00000004
      <0> 00000000 d18694fd 00000004 1666b892 cecba800 cecba800 c0957b14
      00000004
      <0> c0957b94 d1851b11 ceda8b00 cecba800 cf276f00 00000001 c0957b14
      000000d0
      Call Trace:
       [<d1851214>] ? sctp_side_effects+0x607/0xdfc [sctp]
       [<d1851b11>] ? sctp_do_sm+0x108/0x159 [sctp]
       [<d1863386>] ? sctp_pname+0x0/0x1d [sctp]
       [<d1861a56>] ? sctp_primitive_ASCONF+0x36/0x3b [sctp]
       [<d185657c>] ? sctp_process_asconf_ack+0x2a4/0x2d3 [sctp]
       [<d184e35c>] ? sctp_sf_do_asconf_ack+0x1dd/0x2b4 [sctp]
       [<d1851ac1>] ? sctp_do_sm+0xb8/0x159 [sctp]
       [<d1863334>] ? sctp_cname+0x0/0x52 [sctp]
       [<d1854377>] ? sctp_assoc_bh_rcv+0xac/0xe1 [sctp]
       [<d1858f0f>] ? sctp_inq_push+0x2d/0x30 [sctp]
       [<d186329d>] ? sctp_rcv+0x797/0x82e [sctp]
      Tested-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
      Signed-off-by: default avatarYuansong Qiao <ysqiao@research.ait.ie>
      Signed-off-by: default avatarShuaijun Zhang <szhang@research.ait.ie>
      Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      c0786693
    • Wei Yongjun's avatar
      sctp: fix to calc the INIT/INIT-ACK chunk length correctly is set · a8170c35
      Wei Yongjun authored
      
      
      When calculating the INIT/INIT-ACK chunk length, we should not
      only account the length of parameters, but also the parameters
      zero padding length, such as AUTH HMACS parameter and CHUNKS
      parameter. Without the parameters zero padding length we may get
      following oops.
      
      skb_over_panic: text:ce2068d2 len:130 put:6 head:cac3fe00 data:cac3fe00 tail:0xcac3fe82 end:0xcac3fe80 dev:<NULL>
      ------------[ cut here ]------------
      kernel BUG at net/core/skbuff.c:127!
      invalid opcode: 0000 [#2] SMP
      last sysfs file: /sys/module/aes_generic/initstate
      Modules linked in: authenc ......
      
      Pid: 4102, comm: sctp_darn Tainted: G      D    2.6.34-rc2 #6
      EIP: 0060:[<c0607630>] EFLAGS: 00010282 CPU: 0
      EIP is at skb_over_panic+0x37/0x3e
      EAX: 00000078 EBX: c07c024b ECX: c07c02b9 EDX: cb607b78
      ESI: 00000000 EDI: cac3fe7a EBP: 00000002 ESP: cb607b74
       DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
      Process sctp_darn (pid: 4102, ti=cb607000 task=cabdc990 task.ti=cb607000)
      Stack:
       c07c02b9 ce2068d2 00000082 00000006 cac3fe00 cac3fe00 cac3fe82 cac3fe80
      <0> c07c024b cac3fe7c cac3fe7a c0608dec ca986e80 ce2068d2 00000006 0000007a
      <0> cb8120ca ca986e80 cb812000 00000003 cb8120c4 ce208a25 cb8120ca cadd9400
      Call Trace:
       [<ce2068d2>] ? sctp_addto_chunk+0x45/0x85 [sctp]
       [<c0608dec>] ? skb_put+0x2e/0x32
       [<ce2068d2>] ? sctp_addto_chunk+0x45/0x85 [sctp]
       [<ce208a25>] ? sctp_make_init+0x279/0x28c [sctp]
       [<c0686a92>] ? apic_timer_interrupt+0x2a/0x30
       [<ce1fdc0b>] ? sctp_sf_do_prm_asoc+0x2b/0x7b [sctp]
       [<ce202823>] ? sctp_do_sm+0xa0/0x14a [sctp]
       [<ce2133b9>] ? sctp_pname+0x0/0x14 [sctp]
       [<ce211d72>] ? sctp_primitive_ASSOCIATE+0x2b/0x31 [sctp]
       [<ce20f3cf>] ? sctp_sendmsg+0x7a0/0x9eb [sctp]
       [<c064eb1e>] ? inet_sendmsg+0x3b/0x43
       [<c04244b7>] ? task_tick_fair+0x2d/0xd9
       [<c06031e1>] ? sock_sendmsg+0xa7/0xc1
       [<c0416afe>] ? smp_apic_timer_interrupt+0x6b/0x75
       [<c0425123>] ? dequeue_task_fair+0x34/0x19b
       [<c0446abb>] ? sched_clock_local+0x17/0x11e
       [<c052ea87>] ? _copy_from_user+0x2b/0x10c
       [<c060ab3a>] ? verify_iovec+0x3c/0x6a
       [<c06035ca>] ? sys_sendmsg+0x186/0x1e2
       [<c042176b>] ? __wake_up_common+0x34/0x5b
       [<c04240c2>] ? __wake_up+0x2c/0x3b
       [<c057e35c>] ? tty_wakeup+0x43/0x47
       [<c04430f2>] ? remove_wait_queue+0x16/0x24
       [<c0580c94>] ? n_tty_read+0x5b8/0x65e
       [<c042be02>] ? default_wake_function+0x0/0x8
       [<c0604e0e>] ? sys_socketcall+0x17f/0x1cd
       [<c040264c>] ? sysenter_do_call+0x12/0x22
      Code: 0f 45 de 53 ff b0 98 00 00 00 ff b0 94 ......
      EIP: [<c0607630>] skb_over_panic+0x37/0x3e SS:ESP 0068:cb607b74
      
      To reproduce:
      
      # modprobe sctp
      # echo 1 > /proc/sys/net/sctp/addip_enable
      # echo 1 > /proc/sys/net/sctp/auth_enable
      # sctp_test -H 3ffe:501:ffff:100:20c:29ff:fe4d:f37e -P 800 -l
      # sctp_darn -H 3ffe:501:ffff:100:20c:29ff:fe4d:f37e -P 900 -h 192.168.0.21 -p 800 -I -s -t
      sctp_darn ready to send...
      3ffe:501:ffff:100:20c:29ff:fe4d:f37e:900-192.168.0.21:800 Interactive mode> bindx-add=192.168.0.21
      3ffe:501:ffff:100:20c:29ff:fe4d:f37e:900-192.168.0.21:800 Interactive mode> bindx-add=192.168.1.21
      3ffe:501:ffff:100:20c:29ff:fe4d:f37e:900-192.168.0.21:800 Interactive mode> snd=10
      
      ------------------------------------------------------------------
      eth0 has addresses: 3ffe:501:ffff:100:20c:29ff:fe4d:f37e and 192.168.0.21
      eth1 has addresses: 192.168.1.21
      ------------------------------------------------------------------
      Reported-by: default avatarGeorge Cheimonidis <gchimon@gmail.com>
      Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
      Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      a8170c35
    • Vlad Yasevich's avatar
      sctp: per_cpu variables should be in bh_disabled section · 81419d86
      Vlad Yasevich authored
      
      
      Since the change of the atomics to percpu variables, we now
      have to disable BH in process context when touching percpu variables.
      Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      81419d86
    • Vlad Yasevich's avatar
      sctp: fix potential reference of a freed pointer · 0c42749c
      Vlad Yasevich authored
      
      
      When sctp attempts to update an assocition, it removes any
      addresses that were not in the updated INITs.  However, the loop
      may attempt to refrence a transport with address after removing it.
      Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      0c42749c
    • Wei Yongjun's avatar
      sctp: avoid irq lock inversion while call sk->sk_data_ready() · 561b1733
      Wei Yongjun authored
      
      
      sk->sk_data_ready() of sctp socket can be called from both BH and non-BH
      contexts, but the default sk->sk_data_ready(), sock_def_readable(), can
      not be used in this case. Therefore, we have to make a new function
      sctp_data_ready() to grab sk->sk_data_ready() with BH disabling.
      
      =========================================================
      [ INFO: possible irq lock inversion dependency detected ]
      2.6.33-rc6 #129
      ---------------------------------------------------------
      sctp_darn/1517 just changed the state of lock:
       (clock-AF_INET){++.?..}, at: [<c06aab60>] sock_def_readable+0x20/0x80
      but this lock took another, SOFTIRQ-unsafe lock in the past:
       (slock-AF_INET){+.-...}
      
      and interrupts could create inverse lock ordering between them.
      
      other info that might help us debug this:
      1 lock held by sctp_darn/1517:
       #0:  (sk_lock-AF_INET){+.+.+.}, at: [<cdfe363d>] sctp_sendmsg+0x23d/0xc00 [sctp]
      Signed-off-by: default avatarWei Yongjun <yjwei@cn.fujitsu.com>
      Signed-off-by: default avatarVlad Yasevich <vladislav.yasevich@hp.com>
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      561b1733
    • David S. Miller's avatar
      Revert "tcp: bind() fix when many ports are bound" · 8d238b25
      David S. Miller authored
      This reverts two commits:
      
      fda48a0d
      tcp: bind() fix when many ports are bound
      
      and a follow-on fix for it:
      
      6443bb1f
      
      
      ipv6: Fix inet6_csk_bind_conflict()
      
      It causes problems with binding listening sockets when time-wait
      sockets from a previous instance still are alive.
      
      It's too late to keep fiddling with this so late in the -rc
      series, and we'll deal with it in net-next-2.6 instead.
      Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
      8d238b25