1. 31 Jul, 2012 2 commits
  2. 29 Jul, 2012 1 commit
  3. 09 Jul, 2012 1 commit
    • Stephen Boyd's avatar
      ARM: 7457/1: smp: Fix suspicious RCU originating from cpu_die() · ff081e05
      Stephen Boyd authored
      While running hotplug tests I ran into this RCU splat
      
      ===============================
      [ INFO: suspicious RCU usage. ]
      3.4.0 #3275 Tainted: G        W
      -------------------------------
      include/linux/rcupdate.h:729 rcu_read_lock() used illegally while idle!
      
      other info that might help us debug this:
      
      RCU used illegally from idle CPU!
      rcu_scheduler_active = 1, debug_locks = 0
      RCU used illegally from extended quiescent state!
      4 locks held by swapper/2/0:
       #0:  ((cpu_died).wait.lock){......}, at: [<c00ab128>] complete+0x1c/0x5c
       #1:  (&p->pi_lock){-.-.-.}, at: [<c00b275c>] try_to_wake_up+0x2c/0x388
       #2:  (&rq->lock){-.-.-.}, at: [<c00b2860>] try_to_wake_up+0x130/0x388
       #3:  (rcu_read_lock){.+.+..}, at: [<c00abe5c>] cpuacct_charge+0x28/0x1f4
      
      stack backtrace:
      [<c001521c>] (unwind_backtrace+0x0/0x12c) from [<c00abec8>] (cpuacct_charge+0x94/0x1f4)
      [<c00abec8>] (cpuacct_charge+0x94/0x1f4) from [<c00b395c>] (update_curr+0x24c/0x2c8)
      [<c00b395c>] (update_curr+0x24c/0x2c8) from [<c00b59c4>] (enqueue_task_fair+0x50/0x194)
      [<c00b59c4>] (enqueue_task_fair+0x50/0x194) from [<c00afea4>] (enqueue_task+0x30/0x34)
      [<c00afea4>] (enqueue_task+0x30/0x34) from [<c00b0908>] (ttwu_activate+0x14/0x38)
      [<c00b0908>] (ttwu_activate+0x14/0x38) from [<c00b28a8>] (try_to_wake_up+0x178/0x388)
      [<c00b28a8>] (try_to_wake_up+0x178/0x388) from [<c00a82a0>] (__wake_up_common+0x34/0x78)
      [<c00a82a0>] (__wake_up_common+0x34/0x78) from [<c00ab154>] (complete+0x48/0x5c)
      [<c00ab154>] (complete+0x48/0x5c) from [<c07db7cc>] (cpu_die+0x2c/0x58)
      [<c07db7cc>] (cpu_die+0x2c/0x58) from [<c000f954>] (cpu_idle+0x64/0xfc)
      [<c000f954>] (cpu_idle+0x64/0xfc) from [<80208160>] (0x80208160)
      
      When a cpu is marked offline during its idle thread it calls
      cpu_die() during an RCU idle period. cpu_die() calls complete()
      to notify the killing process that the cpu has died. complete()
      calls into the scheduler code and eventually grabs an RCU read
      lock in cpuacct_charge().
      
      Mark complete() as RCU_NONIDLE so that RCU pays attention to this
      CPU for the duration of the complete() function even though it's
      in idle.
      Suggested-by: default avatar"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
      Signed-off-by: default avatarStephen Boyd <sboyd@codeaurora.org>
      Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
      ff081e05
  4. 08 Jul, 2012 3 commits
  5. 07 Jul, 2012 2 commits
    • Linus Torvalds's avatar
      Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm · cd6407fe
      Linus Torvalds authored
      Pull ARM fixes from Russell King:
       "Last merge window, we had some updates from Al cleaning up the signal
        restart handling.  These have caused some problems on ARM, and while
        Al has some fixes, we have some concerns with Al's patches but we've
        been unsuccesful with discussing this.
      
        We have got to the point where we need to do something, and we've
        decided that the best solution is to revert the appropriate commits
        until Al is able to reply to us.
      
        Also included here are four patches to fix warnings that I've noticed
        in my build system, and one fix for kprobes test code."
      
      * 'fixes' of git://git.linaro.org/people/rmk/linux-arm:
        ARM: fix warning caused by wrongly typed arm_dma_limit
        ARM: fix warnings about atomic64_read
        ARM: 7440/1: kprobes: only test 'sub pc, pc, #1b-2b+8-2' on ARMv6
        ARM: 7441/1: perf: return -EOPNOTSUPP if requested mode exclusion is unavailable
        ARM: 7443/1: Revert "new way of handling ERESTART_RESTARTBLOCK"
        ARM: 7442/1: Revert "remove unused restart trampoline"
        ARM: fix set_domain() macro
        ARM: fix mach-versatile/pci.c warning
      cd6407fe
    • Andy Lutomirski's avatar
      security: Minor improvements to no_new_privs documentation · c540521b
      Andy Lutomirski authored
      The documentation didn't actually mention how to enable no_new_privs.
      This also adds a note about possible interactions between
      no_new_privs and LSMs (i.e. why teaching systemd to set no_new_privs
      is not necessarily a good idea), and it references the new docs
      from include/linux/prctl.h.
      Suggested-by: default avatarRob Landley <rob@landley.net>
      Signed-off-by: default avatarAndy Lutomirski <luto@amacapital.net>
      Acked-by: default avatarKees Cook <keescook@chromium.org>
      Signed-off-by: default avatarJames Morris <james.l.morris@oracle.com>
      c540521b
  6. 06 Jul, 2012 11 commits
  7. 05 Jul, 2012 17 commits
  8. 04 Jul, 2012 3 commits