[LTP] [PATCH] arm64: add tst_atomic_add_return

[Jan Stancek]

----- Original Message -----
> From: "Yury Norov" <ynorov@caviumnetworks.com>
> To: ltp@lists.linux.it
> Sent: Wednesday, 25 January, 2017 10:13:42 PM
> Subject: [LTP] [PATCH] arm64: add tst_atomic_add_return
> 
> The patch fixes build of LTP, at least with gcc 5.3.
> The implementation is taken from kernel v4.9.
> 
> Signed-off-by: Yury Norov <ynorov@caviumnetworks.com>
> ---
>  include/tst_atomic.h | 21 +++++++++++++++++++++
>  1 file changed, 21 insertions(+)

Hi,

looks good to me, I'm getting a system to test this as well.

Regards,
Jan

> 
> diff --git a/include/tst_atomic.h b/include/tst_atomic.h
> index 799d735..35a3b34 100644
> --- a/include/tst_atomic.h
> +++ b/include/tst_atomic.h
> @@ -131,6 +131,27 @@ static inline int tst_atomic_add_return(int i, int *v)
>  
>  	return val;
>  }
> +
> +#elif defined (__aarch64__)
> +static inline int tst_atomic_add_return(int i, int *v)
> +{
> +	unsigned long tmp;
> +	int result;
> +
> +	__asm__ __volatile__(
> +"       prfm    pstl1strm, %2	\n"
> +"1:     ldxr 	%w0, %2		\n"
> +"       add	%w0, %w0, %w3	\n"
> +"       stlxr	%w1, %w0, %2	\n"
> +"       cbnz	%w1, 1b		\n"
> +"       dmb ish			\n"
> +	: "=&r" (result), "=&r" (tmp), "+Q" (*v)
> +	: "Ir" (i)
> +	: "memory");
> +
> +	return result;
> +}
> +
>  #else /* HAVE_SYNC_ADD_AND_FETCH == 1 */
>  # error Your compiler does not provide __sync_add_and_fetch and LTP\
>  	implementation is missing for your architecture.
> --
> 2.7.4
> 
> 
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>