linux-kernel - Re: [PATCH] xen/pvcalls: use WARN_ON(1) instead of _

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Date:   Fri, 21 Jul 2017 12:26:11 -0700 (PDT)
From:   Stefano Stabellini <sstabellini@...nel.org>
To:     Arnd Bergmann <arnd@...db.de>
cc:     Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        xen-devel@...ts.xenproject.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] xen/pvcalls: use WARN_ON(1) instead of __WARN()

On Fri, 21 Jul 2017, Arnd Bergmann wrote:
> __WARN() is an internal helper that is only available on
> some architectures, but causes a build error e.g. on ARM64
> in some configurations:
> 
> drivers/xen/pvcalls-back.c: In function 'set_backend_state':
> drivers/xen/pvcalls-back.c:1097:5: error: implicit declaration of function '__WARN' [-Werror=implicit-function-declaration]
> 
> Unfortunately, there is no equivalent of BUG() that takes no
> arguments, but WARN_ON(1) is commonly used in other drivers
> and works on all configurations.
> 
> Fixes: 7160378206b2 ("xen/pvcalls: xenbus state handling")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Stefano Stabellini <sstabellini@...nel.org>


> ---
>  drivers/xen/pvcalls-back.c | 10 +++++-----
>  1 file changed, 5 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
> index d6c4c4aecb41..00c1a2344330 100644
> --- a/drivers/xen/pvcalls-back.c
> +++ b/drivers/xen/pvcalls-back.c
> @@ -1094,7 +1094,7 @@ static void set_backend_state(struct xenbus_device *dev,
>  				xenbus_switch_state(dev, XenbusStateClosing);
>  				break;
>  			default:
> -				__WARN();
> +				WARN_ON(1);
>  			}
>  			break;
>  		case XenbusStateInitWait:
> @@ -1109,7 +1109,7 @@ static void set_backend_state(struct xenbus_device *dev,
>  				xenbus_switch_state(dev, XenbusStateClosing);
>  				break;
>  			default:
> -				__WARN();
> +				WARN_ON(1);
>  			}
>  			break;
>  		case XenbusStateConnected:
> @@ -1123,7 +1123,7 @@ static void set_backend_state(struct xenbus_device *dev,
>  				xenbus_switch_state(dev, XenbusStateClosing);
>  				break;
>  			default:
> -				__WARN();
> +				WARN_ON(1);
>  			}
>  			break;
>  		case XenbusStateClosing:
> @@ -1134,11 +1134,11 @@ static void set_backend_state(struct xenbus_device *dev,
>  				xenbus_switch_state(dev, XenbusStateClosed);
>  				break;
>  			default:
> -				__WARN();
> +				WARN_ON(1);
>  			}
>  			break;
>  		default:
> -			__WARN();
> +			WARN_ON(1);
>  		}
>  	}
>  }
> -- 
> 2.9.0
>