[PATCH cmpxchg 14/14] riscv: Emulate one-byte cmpxchg

[Andrea Parri]

Hi Paul,

> @@ -170,6 +171,9 @@
>  	__typeof__(*(ptr)) __ret;					\
>  	register unsigned int __rc;					\
>  	switch (size) {							\
> +	case 1:								\
> +		__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, (uintptr_t)__old, (uintptr_t)__new); \
> +		break;							\
>  	case 4:								\
>  		__asm__ __volatile__ (					\
>  			"0:	lr.w %0, %2\n"				\
> @@ -214,6 +218,9 @@
>  	__typeof__(*(ptr)) __ret;					\
>  	register unsigned int __rc;					\
>  	switch (size) {							\
> +	case 1:								\
> +		__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
> +		break;							\
>  	case 4:								\
>  		__asm__ __volatile__ (					\
>  			"0:	lr.w %0, %2\n"				\
> @@ -260,6 +267,9 @@
>  	__typeof__(*(ptr)) __ret;					\
>  	register unsigned int __rc;					\
>  	switch (size) {							\
> +	case 1:								\
> +		__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
> +		break;							\
>  	case 4:								\
>  		__asm__ __volatile__ (					\
>  			RISCV_RELEASE_BARRIER				\
> @@ -306,6 +316,9 @@
>  	__typeof__(*(ptr)) __ret;					\
>  	register unsigned int __rc;					\
>  	switch (size) {							\
> +	case 1:								\
> +		__ret = (__typeof__(*(ptr)))cmpxchg_emu_u8((volatile u8 *)__ptr, __old, __new); \
> +		break;							\
>  	case 4:								\
>  		__asm__ __volatile__ (					\
>  			"0:	lr.w %0, %2\n"				\

Seems the last three are missing uintptr_t casts?

  Andrea