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Date: Tue, 9 Apr 2024 19:35:39 +0200
From: Andrea Parri <parri.andrea@gmail.com>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org,
	elver@google.com, akpm@linux-foundation.org, tglx@linutronix.de,
	peterz@infradead.org, dianders@chromium.org, pmladek@suse.com,
	torvalds@linux-foundation.org, Arnd Bergmann <arnd@arndb.de>,
	Yujie Liu <yujie.liu@intel.com>,
	Andi Shyti <andi.shyti@linux.intel.com>,
	Andrzej Hajda <andrzej.hajda@intel.com>,
	linux-riscv@lists.infradead.org,
	Palmer Dabbelt <palmer@rivosinc.com>
Subject: Re: [PATCH cmpxchg 14/14] riscv: Emulate one-byte cmpxchg
Message-ID: <ZhV8a+pWAnJQ3Ljp@andrea>
References: <7b3646e0-667c-48e2-8f09-e493c43c30cb@paulmck-laptop>
 <20240408174944.907695-14-paulmck@kernel.org>
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In-Reply-To: <20240408174944.907695-14-paulmck@kernel.org>

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