diff mbox series

[v2,2/4] locking/atomic: arc: arch_cmpxchg[64]_local undefined

Message ID 20231104091615.4884-3-wuqiang.matt@bytedance.com
State New
Headers
Series locking/atomic: arch_cmpxchg[64]_local undefined |

Commit Message

wuqiang.matt Nov. 4, 2023, 9:16 a.m. UTC 
  For architectures that support native cmpxchg, we'd like to
implement arch_cmpxchg[64]_local with the native variants of
supported data size. If not, the generci_cmpxchg[64]_local
will be used.

Signed-off-by: wuqiang.matt <wuqiang.matt@bytedance.com>
---
 arch/arc/include/asm/cmpxchg.h | 28 ++++++++++++++++++++++++++++
 1 file changed, 28 insertions(+)

Comments

Masami Hiramatsu (Google) Nov. 8, 2023, 1:02 a.m. UTC | #1 
On Sat,  4 Nov 2023 17:16:13 +0800
"wuqiang.matt" <wuqiang.matt@bytedance.com> wrote:

> For architectures that support native cmpxchg, we'd like to
> implement arch_cmpxchg[64]_local with the native variants of
> supported data size. If not, the generci_cmpxchg[64]_local
> will be used.
> 

Looks good to me.

Reviewed-by: Masami Hiramatsu (Google) <mhiramat@kernel.org>

> Signed-off-by: wuqiang.matt <wuqiang.matt@bytedance.com>
> ---
>  arch/arc/include/asm/cmpxchg.h | 28 ++++++++++++++++++++++++++++
>  1 file changed, 28 insertions(+)
> 
> diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
> index bf46514f6f12..91429f2350df 100644
> --- a/arch/arc/include/asm/cmpxchg.h
> +++ b/arch/arc/include/asm/cmpxchg.h
> @@ -80,6 +80,34 @@
>  
>  #endif
>  
> +/*
> + * always make arch_cmpxchg[64]_local available, native cmpxchg
> + * will be used if available, then generic_cmpxchg[64]_local
> + */
> +#include <asm-generic/cmpxchg-local.h>
> +static inline unsigned long __cmpxchg_local(volatile void *ptr,
> +				      unsigned long old,
> +				      unsigned long new, int size)
> +{
> +	switch (size) {
> +#ifdef CONFIG_ARC_HAS_LLSC
> +	case 4:
> +		return __cmpxchg_32((int32_t *)ptr, old, new);
> +#endif
> +	default:
> +		return __generic_cmpxchg_local(ptr, old, new, size);
> +	}
> +
> +	return old;
> +}
> +#define arch_cmpxchg_local(ptr, o, n) ({				\
> +	(__typeof__(*ptr))__cmpxchg_local((ptr),			\
> +					(unsigned long)(o),		\
> +					(unsigned long)(n),		\
> +					sizeof(*(ptr)));		\
> +})
> +#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n))
> +
>  /*
>   * xchg
>   */
> -- 
> 2.40.1
>
diff mbox series

Patch

diff --git a/arch/arc/include/asm/cmpxchg.h b/arch/arc/include/asm/cmpxchg.h
index bf46514f6f12..91429f2350df 100644
--- a/arch/arc/include/asm/cmpxchg.h
+++ b/arch/arc/include/asm/cmpxchg.h
@@ -80,6 +80,34 @@ 
 
 #endif
 
+/*
+ * always make arch_cmpxchg[64]_local available, native cmpxchg
+ * will be used if available, then generic_cmpxchg[64]_local
+ */
+#include <asm-generic/cmpxchg-local.h>
+static inline unsigned long __cmpxchg_local(volatile void *ptr,
+				      unsigned long old,
+				      unsigned long new, int size)
+{
+	switch (size) {
+#ifdef CONFIG_ARC_HAS_LLSC
+	case 4:
+		return __cmpxchg_32((int32_t *)ptr, old, new);
+#endif
+	default:
+		return __generic_cmpxchg_local(ptr, old, new, size);
+	}
+
+	return old;
+}
+#define arch_cmpxchg_local(ptr, o, n) ({				\
+	(__typeof__(*ptr))__cmpxchg_local((ptr),			\
+					(unsigned long)(o),		\
+					(unsigned long)(n),		\
+					sizeof(*(ptr)));		\
+})
+#define arch_cmpxchg64_local(ptr, o, n) __generic_cmpxchg64_local((ptr), (o), (n))
+
 /*
  * xchg
  */