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

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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>
[kdrag0n: dropped changes to arch/sparc to due to conflicts]
Signed-off-by: Danny Lin <danny@kdrag0n.dev>
This commit is contained in:
Will Deacon 2017-10-03 19:25:28 +01:00 committed by Adithya R
parent 10a274c7f6
commit fa482cfdeb
13 changed files with 3 additions and 48 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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@ -416,8 +416,4 @@ 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
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@ -280,8 +280,4 @@ 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
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@ -143,10 +143,6 @@ static inline int arch_spin_is_contended(arch_spinlock_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()
/* See include/linux/spinlock.h */
#define smp_mb__after_spinlock() smp_mb()

4
arch/blackfin/include/asm/spinlock.h
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@ -92,10 +92,6 @@ 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

@ -273,8 +273,4 @@ 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

@ -321,8 +321,4 @@ 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

@ -21,8 +21,4 @@
#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

@ -243,8 +243,4 @@ static inline int arch_read_can_lock(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

@ -46,6 +46,7 @@ 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)
{
@ -269,10 +270,12 @@ 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

@ -105,8 +105,4 @@ 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

@ -212,8 +212,4 @@ 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/x86/include/asm/spinlock.h
View File

@ -45,8 +45,4 @@
#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 */