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locking/arch: Remove dummy arch_{read,spin,write}_relax() implementations 

arch_{read,spin,write}_relax() are defined as cpu_relax() by the core
code, so architectures that can't do better (i.e. most of them) don't
need to bother with the dummy definitions.

Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: paulmck@linux.vnet.ibm.com
Link: http://lkml.kernel.org/r/1507055129-12300-3-git-send-email-will.deacon@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Will Deacon 2017-10-03 19:25:28 +01:00 committed by Ingo Molnar
parent a8a217c221
commit 0160fb177d
15 changed files with 3 additions and 56 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/arc/include/asm/spinlock.h
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@ -413,8 +413,4 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */

4
arch/arm/include/asm/spinlock.h
View File

@ -273,8 +273,4 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */

4
arch/arm64/include/asm/spinlock.h
View File

@ -306,10 +306,6 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
/* See include/linux/spinlock.h */
#define smp_mb__after_spinlock() smp_mb()

4
arch/blackfin/include/asm/spinlock.h
View File

@ -82,10 +82,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
__raw_write_unlock_asm(&rw->lock);
}
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif
#endif /* !__BFIN_SPINLOCK_H */

4
arch/ia64/include/asm/spinlock.h
View File

@ -269,8 +269,4 @@ static inline int arch_read_trylock(arch_rwlock_t *x)
return (u32)ia64_cmpxchg4_acq((__u32 *)(x), new.word, old.word) == old.word;
}
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_IA64_SPINLOCK_H */

4
arch/m32r/include/asm/spinlock.h
View File

@ -308,8 +308,4 @@ static inline int arch_write_trylock(arch_rwlock_t *lock)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_M32R_SPINLOCK_H */

4
arch/metag/include/asm/spinlock.h
View File

@ -20,8 +20,4 @@
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_H */

4
arch/metag/include/asm/spinlock_lnkget.h
View File

@ -212,8 +212,4 @@ static inline int arch_read_trylock(arch_rwlock_t *rw)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SPINLOCK_LNKGET_H */

4
arch/mips/include/asm/spinlock.h
View File

@ -16,8 +16,4 @@
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_SPINLOCK_H */

3
arch/s390/include/asm/spinlock.h
View File

@ -45,6 +45,7 @@ static inline void arch_spin_relax(arch_spinlock_t *lock)
{
arch_lock_relax(lock->lock);
}
#define arch_spin_relax arch_spin_relax
static inline u32 arch_spin_lockval(int cpu)
{
@ -256,10 +257,12 @@ static inline void arch_read_relax(arch_rwlock_t *rw)
{
arch_lock_relax(rw->owner);
}
#define arch_read_relax arch_read_relax
static inline void arch_write_relax(arch_rwlock_t *rw)
{
arch_lock_relax(rw->owner);
}
#define arch_write_relax arch_write_relax
#endif /* __ASM_SPINLOCK_H */

4
arch/sh/include/asm/spinlock-cas.h
View File

@ -93,8 +93,4 @@ static inline int arch_write_trylock(arch_rwlock_t *rw)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SH_SPINLOCK_CAS_H */

4
arch/sh/include/asm/spinlock-llsc.h
View File

@ -200,8 +200,4 @@ static inline int arch_write_trylock(arch_rwlock_t *rw)
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* __ASM_SH_SPINLOCK_LLSC_H */

4
arch/sparc/include/asm/spinlock_32.h
View File

@ -186,10 +186,6 @@ static inline int __arch_read_trylock(arch_rwlock_t *rw)
#define arch_read_lock_flags(rw, flags) arch_read_lock(rw)
#define arch_write_lock_flags(rw, flags) arch_write_lock(rw)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* !(__ASSEMBLY__) */
#endif /* __SPARC_SPINLOCK_H */

4
arch/sparc/include/asm/spinlock_64.h
View File

@ -16,10 +16,6 @@
#define arch_read_lock_flags(p, f) arch_read_lock(p)
#define arch_write_lock_flags(p, f) arch_write_lock(p)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* !(__ASSEMBLY__) */
#endif /* !(__SPARC64_SPINLOCK_H) */

4
arch/x86/include/asm/spinlock.h
View File

@ -44,8 +44,4 @@
#define arch_read_lock_flags(lock, flags) arch_read_lock(lock)
#define arch_write_lock_flags(lock, flags) arch_write_lock(lock)
#define arch_spin_relax(lock) cpu_relax()
#define arch_read_relax(lock) cpu_relax()
#define arch_write_relax(lock) cpu_relax()
#endif /* _ASM_X86_SPINLOCK_H */