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Subject[tip:locking/core] locking/arch: Remove dummy arch_{read,spin,write}_relax() implementations
Commit-ID:  0160fb177d484367e041ac251fca591a3e49660c
Gitweb: https://git.kernel.org/tip/0160fb177d484367e041ac251fca591a3e49660c
Author: Will Deacon <will.deacon@arm.com>
AuthorDate: Tue, 3 Oct 2017 19:25:28 +0100
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Tue, 10 Oct 2017 11:50:18 +0200

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>
---
arch/arc/include/asm/spinlock.h | 4 ----
arch/arm/include/asm/spinlock.h | 4 ----
arch/arm64/include/asm/spinlock.h | 4 ----
arch/blackfin/include/asm/spinlock.h | 4 ----
arch/ia64/include/asm/spinlock.h | 4 ----
arch/m32r/include/asm/spinlock.h | 4 ----
arch/metag/include/asm/spinlock.h | 4 ----
arch/metag/include/asm/spinlock_lnkget.h | 4 ----
arch/mips/include/asm/spinlock.h | 4 ----
arch/s390/include/asm/spinlock.h | 3 +++
arch/sh/include/asm/spinlock-cas.h | 4 ----
arch/sh/include/asm/spinlock-llsc.h | 4 ----
arch/sparc/include/asm/spinlock_32.h | 4 ----
arch/sparc/include/asm/spinlock_64.h | 4 ----
arch/x86/include/asm/spinlock.h | 4 ----
15 files changed, 3 insertions(+), 56 deletions(-)

diff --git a/arch/arc/include/asm/spinlock.h b/arch/arc/include/asm/spinlock.h
index ce9bfcf..f85bb58 100644
--- a/arch/arc/include/asm/spinlock.h
+++ b/arch/arc/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/arm/include/asm/spinlock.h b/arch/arm/include/asm/spinlock.h
index f522326..d40a28f 100644
--- a/arch/arm/include/asm/spinlock.h
+++ b/arch/arm/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/arm64/include/asm/spinlock.h b/arch/arm64/include/asm/spinlock.h
index 95ad710..1504f2b 100644
--- a/arch/arm64/include/asm/spinlock.h
+++ b/arch/arm64/include/asm/spinlock.h
@@ -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()

diff --git a/arch/blackfin/include/asm/spinlock.h b/arch/blackfin/include/asm/spinlock.h
index 607ef98..3885d12 100644
--- a/arch/blackfin/include/asm/spinlock.h
+++ b/arch/blackfin/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/ia64/include/asm/spinlock.h b/arch/ia64/include/asm/spinlock.h
index c728dda..ed1e6212 100644
--- a/arch/ia64/include/asm/spinlock.h
+++ b/arch/ia64/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/m32r/include/asm/spinlock.h b/arch/m32r/include/asm/spinlock.h
index 0026013..6809a9b 100644
--- a/arch/m32r/include/asm/spinlock.h
+++ b/arch/m32r/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/metag/include/asm/spinlock.h b/arch/metag/include/asm/spinlock.h
index ddf7fe5..b5b4174 100644
--- a/arch/metag/include/asm/spinlock.h
+++ b/arch/metag/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/metag/include/asm/spinlock_lnkget.h b/arch/metag/include/asm/spinlock_lnkget.h
index 6a932a9..d5c334d 100644
--- a/arch/metag/include/asm/spinlock_lnkget.h
+++ b/arch/metag/include/asm/spinlock_lnkget.h
@@ -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 */
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index a7d21da..4260d3f 100644
--- a/arch/mips/include/asm/spinlock.h
+++ b/arch/mips/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/s390/include/asm/spinlock.h b/arch/s390/include/asm/spinlock.h
index dc9c58e..4eca60c 100644
--- a/arch/s390/include/asm/spinlock.h
+++ b/arch/s390/include/asm/spinlock.h
@@ -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 */
diff --git a/arch/sh/include/asm/spinlock-cas.h b/arch/sh/include/asm/spinlock-cas.h
index 3154678..295993c 100644
--- a/arch/sh/include/asm/spinlock-cas.h
+++ b/arch/sh/include/asm/spinlock-cas.h
@@ -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 */
diff --git a/arch/sh/include/asm/spinlock-llsc.h b/arch/sh/include/asm/spinlock-llsc.h
index 06be4a5..a6f9edd1 100644
--- a/arch/sh/include/asm/spinlock-llsc.h
+++ b/arch/sh/include/asm/spinlock-llsc.h
@@ -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 */
diff --git a/arch/sparc/include/asm/spinlock_32.h b/arch/sparc/include/asm/spinlock_32.h
index 76986b8..9d9129e 100644
--- a/arch/sparc/include/asm/spinlock_32.h
+++ b/arch/sparc/include/asm/spinlock_32.h
@@ -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 */
diff --git a/arch/sparc/include/asm/spinlock_64.h b/arch/sparc/include/asm/spinlock_64.h
index f7028f5..3b67705 100644
--- a/arch/sparc/include/asm/spinlock_64.h
+++ b/arch/sparc/include/asm/spinlock_64.h
@@ -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) */
diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
index 6d39190..a558c18 100644
--- a/arch/x86/include/asm/spinlock.h
+++ b/arch/x86/include/asm/spinlock.h
@@ -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 */
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