1. 28 Mar, 2012 1 commit
  2. 04 Mar, 2012 1 commit
    • Paul Gortmaker's avatar
      BUG: headers with BUG/BUG_ON etc. need linux/bug.h · 187f1882
      Paul Gortmaker authored
      If a header file is making use of BUG, BUG_ON, BUILD_BUG_ON, or any
      other BUG variant in a static inline (i.e. not in a #define) then
      that header really should be including <linux/bug.h> and not just
      expecting it to be implicitly present.
      
      We can make this change risk-free, since if the files using these
      headers didn't have exposure to linux/bug.h already, they would have
      been causing compile failures/warnings.
      Signed-off-by: default avatarPaul Gortmaker <paul.gortmaker@windriver.com>
      187f1882
  3. 26 Jul, 2011 1 commit
  4. 17 Aug, 2010 1 commit
  5. 14 Apr, 2009 1 commit
    • Ingo Molnar's avatar
      lockdep: warn about lockdep disabling after kernel taint, fix · 27b19565
      Ingo Molnar authored
      Impact: build fix for Sparc and s390
      
      Stephen Rothwell reported that the Sparc build broke:
      
       In file included from kernel/panic.c:12:
       include/linux/debug_locks.h: In function '__debug_locks_off':
       include/linux/debug_locks.h:15: error: implicit declaration of function 'xchg'
      
      due to:
      
       9eeba613: lockdep: warn about lockdep disabling after kernel taint
      
      There is some inconsistency between architectures about where exactly
      xchg() is defined.
      
      The traditional place is in system.h but the more logical point for it
      is in atomic.h - where most architectures (especially new ones) have
      it defined. These architecture also still offer it via system.h.
      
      Some, such as Sparc or s390 only have it in asm/system.h and not available
      via asm/atomic.h at all.
      
      Use the widest set of headers in debug_locks.h and also include asm/system.h.
      Reported-by: default avatarStephen Rothwell <sfr@canb.auug.org.au>
      Cc: Frederic Weisbecker <fweisbec@gmail.com>
      Cc: "David S. Miller" <davem@davemloft.net>
      Cc: Linus Torvalds <torvalds@linux-foundation.org>
      LKML-Reference: <20090414144317.026498df.sfr@canb.auug.org.au>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      27b19565
  6. 12 Apr, 2009 1 commit
    • Frederic Weisbecker's avatar
      lockdep: warn about lockdep disabling after kernel taint · 9eeba613
      Frederic Weisbecker authored
      Impact: provide useful missing info for developers
      
      Kernel taint can occur in several situations such as warnings,
      load of prorietary or staging modules, bad page, etc...
      
      But when such taint happens, a developer might still be working on
      the kernel, expecting that lockdep is still enabled. But a taint
      disables lockdep without ever warning about it.
      Such a kernel behaviour doesn't really help for kernel development.
      
      This patch adds this missing warning.
      
      Since the taint is done most of the time after the main message that
      explain the real source issue, it seems safe to warn about it inside
      add_taint() so that it appears at last, without hurting the main
      information.
      
      v2: Use a generic helper to disable lockdep instead of an
          open coded xchg().
      Signed-off-by: default avatarFrederic Weisbecker <fweisbec@gmail.com>
      Cc: Peter Zijlstra <peterz@infradead.org>
      LKML-Reference: <1239412638-6739-1-git-send-email-fweisbec@gmail.com>
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      9eeba613
  7. 12 Sep, 2008 1 commit
  8. 05 Jul, 2008 1 commit
  9. 25 Jan, 2008 1 commit
    • Ingo Molnar's avatar
      softlockup: automatically detect hung TASK_UNINTERRUPTIBLE tasks · 82a1fcb9
      Ingo Molnar authored
      this patch extends the soft-lockup detector to automatically
      detect hung TASK_UNINTERRUPTIBLE tasks. Such hung tasks are
      printed the following way:
      
       ------------------>
       INFO: task prctl:3042 blocked for more than 120 seconds.
       "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message
       prctl         D fd5e3793     0  3042   2997
              f6050f38 00000046 00000001 fd5e3793 00000009 c06d8264 c06dae80 00000286
              f6050f40 f6050f00 f7d34d90 f7d34fc8 c1e1be80 00000001 f6050000 00000000
              f7e92d00 00000286 f6050f18 c0489d1a f6050f40 00006605 00000000 c0133a5b
       Call Trace:
        [<c04883a5>] schedule_timeout+0x6d/0x8b
        [<c04883d8>] schedule_timeout_uninterruptible+0x15/0x17
        [<c0133a76>] msleep+0x10/0x16
        [<c0138974>] sys_prctl+0x30/0x1e2
        [<c0104c52>] sysenter_past_esp+0x5f/0xa5
        =======================
       2 locks held by prctl/3042:
       #0:  (&sb->s_type->i_mutex_key#5){--..}, at: [<c0197d11>] do_fsync+0x38/0x7a
       #1:  (jbd_handle){--..}, at: [<c01ca3d2>] journal_start+0xc7/0xe9
       <------------------
      
      the current default timeout is 120 seconds. Such messages are printed
      up to 10 times per bootup. If the system has crashed already then the
      messages are not printed.
      
      if lockdep is enabled then all held locks are printed as well.
      
      this feature is a natural extension to the softlockup-detector (kernel
      locked up without scheduling) and to the NMI watchdog (kernel locked up
      with IRQs disabled).
      
      [ Gautham R Shenoy <ego@in.ibm.com>: CPU hotplug fixes. ]
      [ Andrew Morton <akpm@linux-foundation.org>: build warning fix. ]
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
      82a1fcb9
  10. 22 Dec, 2006 1 commit
  11. 07 Dec, 2006 1 commit
  12. 04 Oct, 2006 1 commit
  13. 06 Aug, 2006 1 commit
  14. 03 Jul, 2006 1 commit
    • Ingo Molnar's avatar
      [PATCH] lockdep: better lock debugging · 9a11b49a
      Ingo Molnar authored
      Generic lock debugging:
      
       - generalized lock debugging framework. For example, a bug in one lock
         subsystem turns off debugging in all lock subsystems.
      
       - got rid of the caller address passing (__IP__/__IP_DECL__/etc.) from
         the mutex/rtmutex debugging code: it caused way too much prototype
         hackery, and lockdep will give the same information anyway.
      
       - ability to do silent tests
      
       - check lock freeing in vfree too.
      
       - more finegrained debugging options, to allow distributions to
         turn off more expensive debugging features.
      
      There's no separate 'held mutexes' list anymore - but there's a 'held locks'
      stack within lockdep, which unifies deadlock detection across all lock
      classes.  (this is independent of the lockdep validation stuff - lockdep first
      checks whether we are holding a lock already)
      
      Here are the current debugging options:
      
      CONFIG_DEBUG_MUTEXES=y
      CONFIG_DEBUG_LOCK_ALLOC=y
      
      which do:
      
       config DEBUG_MUTEXES
                bool "Mutex debugging, basic checks"
      
       config DEBUG_LOCK_ALLOC
               bool "Detect incorrect freeing of live mutexes"
      Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
      Signed-off-by: default avatarArjan van de Ven <arjan@linux.intel.com>
      Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
      Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
      9a11b49a