linux-toradex.git/include/linux/spinlock_api_smp.h, branch v2.6.38.5

locking: Cleanup the name space completely

2009-12-14T22:55:33+00:00

Make the name space hierarchy of locking functions consistent:
     raw_spin* -> _raw_spin* -> __raw_spin*

No functional change.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Acked-by: Ingo Molnar

locking: Further name space cleanups

2009-12-14T22:55:33+00:00

The name space hierarchy for the internal lock functions is now a bit
backwards. raw_spin* functions map to _spin* which use __spin*, while
we would like to have _raw_spin* and __raw_spin*.

_raw_spin* is already used by lock debugging, so rename those funtions
to do_raw_spin* to free up the _raw_spin* name space.

No functional change.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Acked-by: Ingo Molnar

locking: Implement new raw_spinlock

2009-12-14T22:55:32+00:00

Now that the raw_spin name space is freed up, we can implement
raw_spinlock and the related functions which are used to annotate the
locks which are not converted to sleeping spinlocks in preempt-rt.

A side effect is that only such locks can be used with the low level
lock fsunctions which circumvent lockdep.

For !rt spin_* functions are mapped to the raw_spin* implementations.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Acked-by: Ingo Molnar

locking: Separate rwlock api from spinlock api

2009-12-14T22:55:32+00:00

Move the rwlock smp api defines and functions into a separate header
file. Makes the -rt selection simpler and less intrusive.

No functional change.

Signed-off-by: Thomas Gleixner 
Acked-by: Peter Zijlstra 
Acked-by: Ingo Molnar

locking: Make inlining decision Kconfig based

2009-11-13T19:53:28+00:00

commit 892a7c67 (locking: Allow arch-inlined spinlocks) implements the
selection of which lock functions are inlined based on defines in
arch/.../spinlock.h: #define __always_inline__LOCK_FUNCTION

Despite of the name __always_inline__* the lock functions can be built
out of line depending on config options. Also if the arch does not set
some inline defines the generic code might set them; again depending on
config options.

This makes it unnecessary hard to figure out when and which lock
functions are inlined. Aside of that it makes it way harder and
messier for -rt to manipulate the lock functions.

Convert the inlining decision to CONFIG switches. Each lock function
is inlined depending on CONFIG_INLINE_*. The configs implement the
existing dependencies. The architecture code can select ARCH_INLINE_*
to signal that it wants the corresponding lock function inlined.
ARCH_INLINE_* is necessary as Kconfig ignores "depends on"
restrictions when a config element is selected.

No functional change.

Signed-off-by: Thomas Gleixner 
LKML-Reference: <20091109151428.504477141@linutronix.de>
Acked-by: Heiko Carstens 
Reviewed-by: Ingo Molnar 
Acked-by: Peter Zijlstra

locking: Simplify spinlock inlining

2009-08-31T16:08:51+00:00

For !DEBUG_SPINLOCK && !PREEMPT && SMP the spin_unlock()
functions were always inlined by using special defines which
would call the __raw* functions.

The out-of-line variants for these functions would be generated
anyway.

Use the new per unlock/locking variant mechanism to force
inlining of the unlock functions like before. This is not a
functional change, we just get rid of one additional way to
force inlining.

Signed-off-by: Heiko Carstens 
Acked-by: Peter Zijlstra 
Cc: Arnd Bergmann 
Cc: Nick Piggin 
Cc: Martin Schwidefsky 
Cc: Horst Hartmann 
Cc: Christian Ehrhardt 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Cc: David Miller 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: 
LKML-Reference: <20090831124418.848735034@de.ibm.com>
Signed-off-by: Ingo Molnar

locking: Allow arch-inlined spinlocks

2009-08-31T16:08:50+00:00

This allows an architecture to specify per lock variant if the
locking code should be kept out-of-line or inlined.

If an architecure wants out-of-line locking code no change is
needed. To force inlining of e.g. spin_lock() the line:

  #define __always_inline__spin_lock

needs to be added to arch/<...>/include/asm/spinlock.h

If CONFIG_DEBUG_SPINLOCK or CONFIG_GENERIC_LOCKBREAK are
defined the per architecture defines are (partly) ignored and
still out-of-line spinlock code will be generated.

Signed-off-by: Heiko Carstens 
Acked-by: Peter Zijlstra 
Cc: Arnd Bergmann 
Cc: Nick Piggin 
Cc: Martin Schwidefsky 
Cc: Horst Hartmann 
Cc: Christian Ehrhardt 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Cc: David Miller 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: 
LKML-Reference: <20090831124418.375299024@de.ibm.com>
Signed-off-by: Ingo Molnar

locking: Move spinlock function bodies to header file

2009-08-31T16:08:50+00:00

Move spinlock function bodies to header file by creating a
static inline version of each variant. Use the inline version
on the out-of-line code.

This shouldn't make any difference besides that the spinlock
code can now be used to generate inlined spinlock code.

Signed-off-by: Heiko Carstens 
Acked-by: Arnd Bergmann 
Acked-by: Peter Zijlstra 
Cc: Nick Piggin 
Cc: Martin Schwidefsky 
Cc: Horst Hartmann 
Cc: Christian Ehrhardt 
Cc: Andrew Morton 
Cc: Linus Torvalds 
Cc: David Miller 
Cc: Benjamin Herrenschmidt 
Cc: Paul Mackerras 
Cc: Geert Uytterhoeven 
Cc: Roman Zippel 
Cc: 
LKML-Reference: <20090831124417.859022429@de.ibm.com>
Signed-off-by: Ingo Molnar

lockdep: spin_lock_nest_lock()

2008-08-11T07:30:24+00:00

Expose the new lock protection lock.

This can be used to annotate places where we take multiple locks of the
same class and avoid deadlocks by always taking another (top-level) lock
first.

NOTE: we're still bound to the MAX_LOCK_DEPTH (48) limit.

Signed-off-by: Peter Zijlstra 
Signed-off-by: Ingo Molnar

[PATCH] lockdep: spin_lock_irqsave_nested()

2006-11-25T21:28:34+00:00

Introduce spin_lock_irqsave_nested(); implementation from:
 http://lkml.org/lkml/2006/6/1/122
Patch from:
 http://lkml.org/lkml/2006/9/13/258

[akpm@osdl.org: two compile fixes]
Signed-off-by: Arjan van de Ven 
Signed-off-by: Jiri Kosina 
Signed-off-by: Peter Zijlstra 
Acked-by: Ingo Molnar 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds