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mutex: replace CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX with simple ifdef

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Linus suggested to replace

 #ifndef CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX
 #define arch_mutex_cpu_relax() cpu_relax()
 #endif

with just a simple

  #ifndef arch_mutex_cpu_relax
  # define arch_mutex_cpu_relax() cpu_relax()
  #endif

to get rid of CONFIG_HAVE_CPU_RELAX_SIMPLE. So architectures can
simply define arch_mutex_cpu_relax if they want an architecture
specific function instead of having to add a select statement in
their Kconfig in addition.

Suggested-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
This commit is contained in:
Heiko Carstens 2013-09-28 11:23:59 +02:00
parent 6cac446bd3
commit 083986e824
5 changed files with 5 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
arch/Kconfig
View File

@ -286,9 +286,6 @@ config HAVE_PERF_USER_STACK_DUMP
config HAVE_ARCH_JUMP_LABEL
bool
config HAVE_ARCH_MUTEX_CPU_RELAX
bool
config HAVE_RCU_TABLE_FREE
bool

1
arch/s390/Kconfig
View File

@ -102,7 +102,6 @@ config S390
select GENERIC_TIME_VSYSCALL_OLD
select HAVE_ALIGNED_STRUCT_PAGE if SLUB
select HAVE_ARCH_JUMP_LABEL if !MARCH_G5
select HAVE_ARCH_MUTEX_CPU_RELAX
select HAVE_ARCH_SECCOMP_FILTER
select HAVE_ARCH_TRACEHOOK
select HAVE_ARCH_TRANSPARENT_HUGEPAGE if 64BIT

2
arch/s390/include/asm/mutex.h
View File

@ -7,5 +7,3 @@
*/
#include <asm-generic/mutex-dec.h>
#define arch_mutex_cpu_relax() barrier()

2
arch/s390/include/asm/processor.h
View File

@ -198,6 +198,8 @@ static inline void cpu_relax(void)
barrier();
}
#define arch_mutex_cpu_relax() barrier()
static inline void psw_set_key(unsigned int key)
{
asm volatile("spka 0(%0)" : : "d" (key));

6
include/linux/mutex.h
View File

@ -15,8 +15,8 @@
#include <linux/spinlock_types.h>
#include <linux/linkage.h>
#include <linux/lockdep.h>
#include <linux/atomic.h>
#include <asm/processor.h>
/*
* Simple, straightforward mutexes with strict semantics:
@ -175,8 +175,8 @@ extern void mutex_unlock(struct mutex *lock);
extern int atomic_dec_and_mutex_lock(atomic_t *cnt, struct mutex *lock);
#ifndef CONFIG_HAVE_ARCH_MUTEX_CPU_RELAX
#define arch_mutex_cpu_relax() cpu_relax()
#ifndef arch_mutex_cpu_relax
# define arch_mutex_cpu_relax() cpu_relax()
#endif
#endif