Re: [PATCH -next] acpi: fpdt: drop errant comma in pr_info()

From: Zhang Rui
Date: Fri Jan 29 2021 - 01:19:40 EST


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@xxxxxxxxx/
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
>
>