linux-kernel - Re: [PATCH] vhost: use pr_err for vq

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Date: Thu, 16 May 2024 08:33:10 -0400
From: "Michael S. Tsirkin" <mst@...hat.com>
To: "Peng Fan (OSS)" <peng.fan@....nxp.com>
Cc: jasowang@...hat.com, virtualization@...ts.linux-foundation.org,
	eperezma@...hat.com, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, netdev@...r.kernel.org,
	Peng Fan <peng.fan@....com>
Subject: Re: [PATCH] vhost: use pr_err for vq_err

On Thu, May 16, 2024 at 03:46:29PM +0800, Peng Fan (OSS) wrote:
> From: Peng Fan <peng.fan@....com>
> 
> Use pr_err to print out error message without enabling DEBUG. This could
> make people catch error easier.
> 
> Signed-off-by: Peng Fan <peng.fan@....com>

This isn't appropriate: pr_err must not be triggerable
by userspace. If you are debugging userspace, use a debugging
kernel, it's that simple.


> ---
>  drivers/vhost/vhost.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/vhost/vhost.h b/drivers/vhost/vhost.h
> index bb75a292d50c..0bff436d1ce9 100644
> --- a/drivers/vhost/vhost.h
> +++ b/drivers/vhost/vhost.h
> @@ -248,7 +248,7 @@ void vhost_iotlb_map_free(struct vhost_iotlb *iotlb,
>  			  struct vhost_iotlb_map *map);
>  
>  #define vq_err(vq, fmt, ...) do {                                  \
> -		pr_debug(pr_fmt(fmt), ##__VA_ARGS__);       \
> +		pr_err(pr_fmt(fmt), ##__VA_ARGS__);       \
>  		if ((vq)->error_ctx)                               \
>  				eventfd_signal((vq)->error_ctx);\
>  	} while (0)
> -- 
> 2.37.1