linux-kernel - Re: [PATCH 2/2] x86/mm/pat, drivers/media/ivtv: replace WARN() with pr

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Date:	Tue, 23 Jun 2015 09:39:12 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	"Luis R. Rodriguez" <mcgrof@...not-panic.com>
Cc:	bp@...e.de, mchehab@....samsung.com, dledford@...hat.com,
	fengguang.wu@...el.com, linux-media@...r.kernel.org,
	linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
	"Luis R. Rodriguez" <mcgrof@...e.com>
Subject: Re: [PATCH 2/2] x86/mm/pat, drivers/media/ivtv: replace WARN() with
 pr_warn()


* Luis R. Rodriguez <mcgrof@...not-panic.com> wrote:

> From: "Luis R. Rodriguez" <mcgrof@...e.com>
> 
> On built-in kernels this will always splat. Fix that.
> 
> Reported-by: Fengguang Wu <fengguang.wu@...el.com> [0-day test robot]
> Signed-off-by: Luis R. Rodriguez <mcgrof@...e.com>
> ---
>  drivers/media/pci/ivtv/ivtvfb.c | 6 ++++--
>  1 file changed, 4 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/media/pci/ivtv/ivtvfb.c b/drivers/media/pci/ivtv/ivtvfb.c
> index 4cb365d..6f0c364 100644
> --- a/drivers/media/pci/ivtv/ivtvfb.c
> +++ b/drivers/media/pci/ivtv/ivtvfb.c
> @@ -38,6 +38,8 @@
>      Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
>   */
>  
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
>  #include <linux/module.h>
>  #include <linux/kernel.h>
>  #include <linux/fb.h>
> @@ -1266,8 +1268,8 @@ static int __init ivtvfb_init(void)
>  	int err;
>  
>  #ifdef CONFIG_X86_64
> -	if (WARN(pat_enabled(),
> -		 "ivtvfb needs PAT disabled, boot with nopat kernel parameter\n")) {
> +	if (pat_enabled()) {
> +		pr_warn("ivtvfb needs PAT disabled, boot with nopat kernel parameter\n");
>  		return -ENODEV;
>  	}

So why should a built-in kernel bzImage with this driver enabled but the driver 
not present print this warning?

Why not only print in a code path where we know the hardware is present? 

allyesconfig bootups are noisy enough as-is ...

Thanks,

	Ingo
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