linux-kernel - Re: [PATCH -next] acpi: fpdt: drop errant comma in pr

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Date:   Fri, 29 Jan 2021 14:18:39 +0800
From:   Zhang Rui <rui.zhang@...el.com>
To:     Joe Perches <joe@...ches.com>,
        Randy Dunlap <rdunlap@...radead.org>,
        linux-kernel@...r.kernel.org
Cc:     "Rafael J. Wysocki" <rjw@...ysocki.net>,
        "Rafael J . Wysocki" <rafael.j.wysocki@...el.com>,
        Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org
Subject: Re: [PATCH -next] acpi: fpdt: drop errant comma in pr_info()

On Thu, 2021-01-28 at 15:56 -0800, Joe Perches wrote:
> On Thu, 2021-01-28 at 15:25 -0800, Randy Dunlap wrote:
> > Drop a mistaken comma in the pr_info() args to prevent the
> > build warning.
> > 
> > ../drivers/acpi/acpi_fpdt.c: In function 'acpi_init_fpdt':
> > ../include/linux/kern_levels.h:5:18: warning: too many arguments
> > for format [-Wformat-extra-args]
> > ../drivers/acpi/acpi_fpdt.c:255:4: note: in expansion of macro
> > 'pr_info'
> >     pr_info(FW_BUG, "Invalid subtable type %d found.\n",
> 
> []
> > --- linux-next-20210128.orig/drivers/acpi/acpi_fpdt.c
> > +++ linux-next-20210128/drivers/acpi/acpi_fpdt.c
> > @@ -252,7 +252,7 @@ void acpi_init_fpdt(void)
> >  					      subtable->type);
> >  			break;
> >  		default:
> > -			pr_info(FW_BUG, "Invalid subtable type %d
> > found.\n",
> > +			pr_info(FW_BUG "Invalid subtable type %d
> > found.\n",
> >  			       subtable->type);
> 
> Another question would be why is the pr_info when all the other
> FW_BUG uses in this file are pr_err
> 
Here, this FW_BUG just means an unrecognized subtable is found, and it
should not affect the other subtables that are already supported by
this driver. So that's why we didn't use pr_err.
In fact, I've just posted a V2 patch, 
https://patchwork.kernel.org/project/linux-acpi/patch/20210129061548.13448-1-rui.zhang@intel.com/
and I prefer to continue processing even if this FW_BUG is detected.

> One would think it's at least a defect of some time.
> I would think it should at least be pr_notice or pr_warn

I'm also okay with pr_notice/pr_warn here.
This FW_BUG should be really rare.

thanks,
rui
> 
> Documentation/admin-guide/kernel
> -parameters.txt-                        1
> (KERN_ALERT)          action must be taken immediately
> Documentation/admin-guide/kernel
> -parameters.txt-                        2
> (KERN_CRIT)           critical conditions
> Documentation/admin-guide/kernel
> -parameters.txt-                        3 (KERN_ERR)            error
> conditions
> Documentation/admin-guide/kernel
> -parameters.txt-                        4
> (KERN_WARNING)        warning conditions
> Documentation/admin-guide/kernel
> -parameters.txt-                        5
> (KERN_NOTICE)         normal but significant condition
> Documentation/admin-guide/kernel-
> parameters.txt:                        6
> (KERN_INFO)           informational
> Documentation/admin-guide/kernel
> -parameters.txt-                        7
> (KERN_DEBUG)          debug-level messages
> 
>