Re: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86_64

[Andi Kleen]

Sheng Yang <sheng@xxxxxxxxxxxxxxx> writes:

> -static inline int test_and_set_bit(int nr, volatile unsigned long *addr)
> +static inline int test_and_set_bit(long int nr, volatile unsigned long *addr)
>  {
>  	int oldbit;
>  
> -	asm volatile(LOCK_PREFIX "bts %2,%1\n\t"
> +	asm volatile(LOCK_PREFIX REX_X86 "bts %2,%1\n\t"

Use btsq on 64bit, then you don't need the explicit rex prefix.

-Andi

-- 
ak@xxxxxxxxxxxxxxx -- Speaking for myself only.
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