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117 Commits

Author SHA1 Message Date
Linus Torvalds 609862be07 Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 
* 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
  lockdep: add stack dumps to asserts
  hrtimer: fix rq->lock inversion (again)
 2009-04-06 13:37:30 -07:00
Ingo Molnar 8302294f43 Merge branch 'tracing/core-v2' into tracing-for-linus 
Conflicts:
	include/linux/slub_def.h
	lib/Kconfig.debug
	mm/slob.c
	mm/slub.c
 2009-04-02 00:49:02 +02:00
Peter Zijlstra eedeeabdee lockdep: add stack dumps to asserts 
Have a better idea about exactly which loc causes a lockdep
limit overflow. Often it's a bug or inefficiency in that
subsystem.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1237376327.5069.253.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-03-31 14:53:01 +02:00
Ingo Molnar 7bee946358 Merge branch 'linus' into locking-for-linus 
Conflicts:
	lib/Kconfig.debug
 2009-03-31 13:53:43 +02:00
Peter Zijlstra 2f85018152 lockdep: fix deadlock in lockdep_trace_alloc 
Heiko reported that we grab the graph lock with irqs enabled.

Fix this by providng the same wrapper as all other lockdep entry
functions have.

Reported-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Nick Piggin <npiggin@suse.de>
LKML-Reference: <1237544000.24626.52.camel@twins>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-03-30 23:19:24 +02:00
Ingo Molnar 480c93df5b Merge branch 'core/locking' into tracing/ftrace 2009-03-13 01:33:21 +01:00
David Rientjes 03d78913f0 lockdep: remove duplicate CONFIG_DEBUG_LOCKDEP definitions 
Impact: cleanup

The atomic debug modifiers are already defined in
kernel/lockdep_internals.h.

Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <alpine.DEB.2.00.0903050222160.30401@chino.kir.corp.google.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-03-05 11:46:00 +01:00
Peter Zijlstra efed792d67 tracing: add lockdep tracepoints for lock acquire/release 
Augment the traces with lock names when lockdep is available:

 1)               |  down_read_trylock() {
 1)               |    _spin_lock_irqsave() {
 1)               |      /* lock_acquire: &sem->wait_lock */
 1)   4.201 us    |    }
 1)               |    _spin_unlock_irqrestore() {
 1)               |      /* lock_release: &sem->wait_lock */
 1)   3.523 us    |    }
 1)               |  /* lock_acquire: try read &mm->mmap_sem */
 1) + 13.386 us   |  }
 1)   1.635 us    |  find_vma();
 1)               |  handle_mm_fault() {
 1)               |    __do_fault() {
 1)               |      filemap_fault() {
 1)               |        find_lock_page() {
 1)               |          find_get_page() {
 1)               |            /* lock_acquire: read rcu_read_lock */
 1)               |            /* lock_release: rcu_read_lock */
 1)   5.697 us    |          }
 1)   8.158 us    |        }
 1) + 11.079 us   |      }
 1)               |      _spin_lock() {
 1)               |        /* lock_acquire: __pte_lockptr(page) */
 1)   3.949 us    |      }
 1)   1.460 us    |      page_add_file_rmap();
 1)               |      _spin_unlock() {
 1)               |        /* lock_release: __pte_lockptr(page) */
 1)   3.115 us    |      }
 1)               |      unlock_page() {
 1)   1.421 us    |        page_waitqueue();
 1)   1.220 us    |        __wake_up_bit();
 1)   6.519 us    |      }
 1) + 34.328 us   |    }
 1) + 37.452 us   |  }
 1)               |  up_read() {
 1)               |  /* lock_release: &mm->mmap_sem */
 1)               |    _spin_lock_irqsave() {
 1)               |      /* lock_acquire: &sem->wait_lock */
 1)   3.865 us    |    }
 1)               |    _spin_unlock_irqrestore() {
 1)               |      /* lock_release: &sem->wait_lock */
 1)   8.562 us    |    }
 1) + 17.370 us   |  }

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: =?ISO-8859-1?Q?T=F6r=F6k?= Edwin <edwintorok@gmail.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <1236166375.5330.7209.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-03-04 18:49:58 +01:00
Peter Zijlstra 26575e28df lockdep: remove extra "irq" string 
Impact: clarify lockdep printk text

print_irq_inversion_bug() gets handed state strings of the form

  "HARDIRQ", "SOFTIRQ", "RECLAIM_FS"

and appends "-irq-{un,}safe" to them, which is either redudant for *IRQ or
confusing in the RECLAIM_FS case.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1236175192.5330.7585.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-03-04 18:38:34 +01:00
Peter Zijlstra 1c21f14ec4 lockdep: fix incorrect state name 
In the recent mark_lock_irq() rework a bug snuck in that would report the
state of write locks causing irq inversion under a read lock as a read
lock.

Fix this by masking the read bit of the state when validating write
dependencies.

Reported-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1236172646.5330.7450.camel@laptop>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-03-04 18:38:33 +01:00
Peter Zijlstra 868a23a804 lockdep: build fix for !PROVE_LOCKING 
The __GFP_FS annotations fail to build with CONFIG_LOCKDEP=y,
CONFIG_PROVE_LOCKING=n, ammend that.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-15 00:30:26 +01:00
Peter Zijlstra b4b136f44b lockdep: use stringify.h 
Arnd pointed out we have the stringify macro magic already in-kernel.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
CC: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:26 +01:00
Peter Zijlstra 4f367d8adc lockdep: simplify check_prev_add_irq() 
Remove the manual state iteration thingy.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:24 +01:00
Peter Zijlstra f510b233cf lockdep: get_user_chars() redo 
Generic, states independent, get_user_chars().

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:22 +01:00
Peter Zijlstra 3ff176ca47 lockdep: simplify get_user_chars() 
there's too much repetition of code..

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:21 +01:00
Peter Zijlstra 38aa271438 lockdep: add comments to mark_lock_irq() 
re-add some of the comments that got lost in the refactoring.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:19 +01:00
Peter Zijlstra cf2ad4d13c lockdep: remove macro usage from mark_held_locks() 
Now that we have nice numerical relations for the states, remove the macro
magics.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:17 +01:00
Peter Zijlstra 9d3651a23d lockdep: fully reduce mark_lock_irq() 
Now what its only two functions, they again look rather similar.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:15 +01:00
Peter Zijlstra 42c50d544e lockdep: merge the !_READ mark_lock_irq() helpers 
These two are also remakably similar

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:13 +01:00
Peter Zijlstra 780e820b2d lockdep: merge the _READ mark_lock_irq() helpers 
The _READ helpers show remarkable similarity, merge them.

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:12 +01:00
Peter Zijlstra cd95302d25 lockdep: simplify mark_lock_irq() helpers #3 
Kill another argument

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:10 +01:00
Peter Zijlstra f989209e2f lockdep: further simplify mark_lock_irq() helpers 
take away another parameter

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:08 +01:00
Peter Zijlstra 604de3b5b6 lockdep: simplify the mark_lock_irq() helpers 
In order to unify them, take some arguments away

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:06 +01:00
Peter Zijlstra 6a6904d347 lockdep: split up mark_lock_irq() 
split mark_lock_irq() into 4 simple helper functions

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:04 +01:00
Peter Zijlstra fabe9c42c6 lockdep: generate usage strings 
generate the usage strings

XXX capital invasion :-(

Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
 2009-02-14 23:28:02 +01:00