On Fri, 21 Jun 2013, Will Deacon wrote:
> The arch_{spin,read,write}_relax macros are not used anywhere in the
> kernel and are typically just aliases for cpu_relax().
>
> This patch removes the unused definitions for x86.
>
> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> Cc: Ingo Molnar <mingo@xxxxxxxxxx>
> Cc: H. Peter Anvin <hpa@xxxxxxxxx>
> Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Acked-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
> ---
> arch/x86/include/asm/spinlock.h | 4 ----
> 1 file changed, 4 deletions(-)
>
> diff --git a/arch/x86/include/asm/spinlock.h b/arch/x86/include/asm/spinlock.h
> index 33692ea..1088d8d 100644
> --- a/arch/x86/include/asm/spinlock.h
> +++ b/arch/x86/include/asm/spinlock.h
> @@ -229,10 +229,6 @@ static inline void arch_write_unlock(arch_rwlock_t *rw)
> #undef WRITE_LOCK_SUB
> #undef WRITE_LOCK_CMP
>
> -#define arch_spin_relax(lock) cpu_relax()
> -#define arch_read_relax(lock) cpu_relax()
> -#define arch_write_relax(lock) cpu_relax()
> -
> /* The {read|write|spin}_lock() on x86 are full memory barriers. */
> static inline void smp_mb__after_lock(void) { }
> #define ARCH_HAS_SMP_MB_AFTER_LOCK
> --
> 1.8.2.2
>
>
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