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locking/kconfig: Simplify INLINE_SPIN_UNLOCK usage 

Get rid of INLINE_SPIN_UNLOCK entirely replacing it with
UNINLINE_SPIN_UNLOCK instead of the reverse meaning.

Whoever wants to change the default spinlock inlining
behavior and uninline the spinlocks for some weird reason,
such as spinlock debugging, paravirt etc. can now all just
select UNINLINE_SPIN_UNLOCK

Original discussion at: https://lkml.org/lkml/2012/3/21/357

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Chris Zankel <chris@zankel.net>
Cc: linux-mips@linux-mips.org
Link: http://lkml.kernel.org/r/20120322095502.30866.75756.sendpatchset@codeblue
[ tidied up the changelog a bit ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Raghavendra K T 2012-03-22 15:25:08 +05:30 committed by Ingo Molnar
parent 280fb016bf
commit e335e3eb82
7 changed files with 8 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
arch/mips/configs/db1300_defconfig
View File

@ -133,7 +133,7 @@ CONFIG_BLK_DEV_BSG=y
CONFIG_IOSCHED_NOOP=y
CONFIG_DEFAULT_NOOP=y
CONFIG_DEFAULT_IOSCHED="noop"
CONFIG_INLINE_SPIN_UNLOCK=y
# CONFIG_UNINLINE_SPIN_UNLOCK is not set
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
CONFIG_INLINE_READ_UNLOCK=y
CONFIG_INLINE_READ_UNLOCK_IRQ=y

2
arch/xtensa/configs/iss_defconfig
View File

@ -113,7 +113,7 @@ CONFIG_DEFAULT_IOSCHED="noop"
# CONFIG_INLINE_SPIN_LOCK_BH is not set
# CONFIG_INLINE_SPIN_LOCK_IRQ is not set
# CONFIG_INLINE_SPIN_LOCK_IRQSAVE is not set
CONFIG_INLINE_SPIN_UNLOCK=y
# CONFIG_UNINLINE_SPIN_UNLOCK is not set
# CONFIG_INLINE_SPIN_UNLOCK_BH is not set
CONFIG_INLINE_SPIN_UNLOCK_IRQ=y
# CONFIG_INLINE_SPIN_UNLOCK_IRQRESTORE is not set

2
include/linux/spinlock_api_smp.h
View File

@ -67,7 +67,7 @@ _raw_spin_unlock_irqrestore(raw_spinlock_t *lock, unsigned long flags)
#define _raw_spin_trylock_bh(lock) __raw_spin_trylock_bh(lock)
#endif
#ifdef CONFIG_INLINE_SPIN_UNLOCK
#ifndef CONFIG_UNINLINE_SPIN_UNLOCK
#define _raw_spin_unlock(lock) __raw_spin_unlock(lock)
#endif

4
kernel/Kconfig.locks
View File

@ -124,8 +124,8 @@ config INLINE_SPIN_LOCK_IRQSAVE
def_bool !DEBUG_SPINLOCK && !GENERIC_LOCKBREAK && \
ARCH_INLINE_SPIN_LOCK_IRQSAVE
config INLINE_SPIN_UNLOCK
def_bool !DEBUG_SPINLOCK && (!PREEMPT || ARCH_INLINE_SPIN_UNLOCK)
config UNINLINE_SPIN_UNLOCK
bool
config INLINE_SPIN_UNLOCK_BH
def_bool !DEBUG_SPINLOCK && ARCH_INLINE_SPIN_UNLOCK_BH

1
kernel/Kconfig.preempt
View File

@ -36,6 +36,7 @@ config PREEMPT_VOLUNTARY
config PREEMPT
bool "Preemptible Kernel (Low-Latency Desktop)"
select PREEMPT_COUNT
select UNINLINE_SPIN_UNLOCK if !ARCH_INLINE_SPIN_UNLOCK
help
This option reduces the latency of the kernel by making
all kernel code (that is not executing in a critical section)

2
kernel/spinlock.c
View File

@ -163,7 +163,7 @@ void __lockfunc _raw_spin_lock_bh(raw_spinlock_t *lock)
EXPORT_SYMBOL(_raw_spin_lock_bh);
#endif
#ifndef CONFIG_INLINE_SPIN_UNLOCK
#ifdef CONFIG_UNINLINE_SPIN_UNLOCK
void __lockfunc _raw_spin_unlock(raw_spinlock_t *lock)
{
__raw_spin_unlock(lock);

1
lib/Kconfig.debug
View File

@ -499,6 +499,7 @@ config RT_MUTEX_TESTER
config DEBUG_SPINLOCK
bool "Spinlock and rw-lock debugging: basic checks"
depends on DEBUG_KERNEL
select UNINLINE_SPIN_UNLOCK
help
Say Y here and build SMP to catch missing spinlock initialization
and certain other kinds of spinlock errors commonly made. This is