netdev - Re: [PATCH] vhost: Don't use defined in VHOST_ARCH_CAN_ACCEL

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Date:   Thu, 6 Jun 2019 13:06:23 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     Jason Wang <jasowang@...hat.com>, kvm@...r.kernel.org,
        virtualization@...ts.linux-foundation.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] vhost: Don't use defined in VHOST_ARCH_CAN_ACCEL_UACCESS
 definition

On Thu, Jun 06, 2019 at 02:28:55PM -0400, Michael S. Tsirkin wrote:
> I'd prefer just changing the definition.
> ifdefs have a disadvantage that it's easy to get
> wrong code if you forget to include a header.
> 
> I queued the below - pls confirm it works for you.

Fine by me, I figured that might be preferred (since clang will warn if
VHOST_ARCH_CAN_ACCEL_UACCESS is not defined so you'd know if the header
was forgotten). Thank you for the fix :)

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>
Tested-by: Nathan Chancellor <natechancellor@...il.com>

> 
> 
> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> index c5d950cf7627..819296332913 100644
> --- a/drivers/vhost/vhost.h
> +++ b/drivers/vhost/vhost.h
> @@ -95,8 +95,11 @@ struct vhost_uaddr {
>  	bool write;
>  };
>  
> -#define VHOST_ARCH_CAN_ACCEL_UACCESS defined(CONFIG_MMU_NOTIFIER) && \
> -	ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 0
> +#if defined(CONFIG_MMU_NOTIFIER) && ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE == 0
> +#define VHOST_ARCH_CAN_ACCEL_UACCESS 1
> +#else
> +#define VHOST_ARCH_CAN_ACCEL_UACCESS 0
> +#endif
>  
>  /* The virtqueue structure describes a queue attached to a device. */
>  struct vhost_virtqueue {