linux-kernel - Re: [PATCH 7/7] watchdog: Add watchdog driver for OCTEON SOCs.

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Message-ID: <20100724035826.GA27516@merkur.ravnborg.org>
Date:	Sat, 24 Jul 2010 05:58:26 +0200
From:	Sam Ravnborg <sam@...nborg.org>
To:	David Daney <ddaney@...iumnetworks.com>
Cc:	linux-mips@...ux-mips.org, ralf@...ux-mips.org, wim@...ana.be,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Tony Lindgren <tony@...mide.com>,
	Marc Zyngier <maz@...terjones.org>,
	Thierry Reding <thierry.reding@...onic-design.de>
Subject: Re: [PATCH 7/7] watchdog: Add watchdog driver for OCTEON SOCs.

Hi David.

In general a very nicely commented piece of code!

A few nits...

> diff --git a/drivers/watchdog/Makefile b/drivers/watchdog/Makefile
> index 72f3e20..4e7179b 100644
> --- a/drivers/watchdog/Makefile
> +++ b/drivers/watchdog/Makefile
> @@ -114,6 +114,8 @@ obj-$(CONFIG_PNX833X_WDT) += pnx833x_wdt.o
>  obj-$(CONFIG_SIBYTE_WDOG) += sb_wdog.o
>  obj-$(CONFIG_AR7_WDT) += ar7_wdt.o
>  obj-$(CONFIG_TXX9_WDT) += txx9wdt.o
> +obj-$(CONFIG_OCTEON_WDT) += octeon-wdt.o
> +octeon-wdt-objs := octeon-wdt-main.o octeon-wdt-nmi.o

The use of foo-objs := ... is considered old-school.
Use:

    octeon-wdt-y := octeon-wdt-main.o octeon-wdt-nmi.o

It is the same functionality.

> +
> +#include <linux/bitops.h>
> +#include <linux/cpu.h>
> +#include <linux/cpumask.h>
> +#include <linux/delay.h>
> +#include <linux/fs.h>
> +#include <linux/interrupt.h>
> +#include <linux/kernel.h>
> +#include <linux/miscdevice.h>
> +#include <linux/module.h>
> +#include <linux/smp.h>
> +#include <linux/string.h>
> +#include <linux/watchdog.h>

People have started to use the "inverse christmas tree" for
include files.

But you sort is alphabetically which is also good.

The "inverse christmas tree" would look like this:

#include <linux/miscdevice.h>
#include <linux/interrupt.h>
#include <linux/watchdog.h>
#include <linux/cpumask.h>
#include <linux/bitops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/delay.h>
#include <linux/cpu.h>
#include <linux/smp.h>
#include <linux/fs.h>

Both styles are fine so pick what you like.

> +module_param(heartbeat, int, 0444);
module_param(heartbeat, int, S_IRUSR | S_IRGRP | S_IROTH);

or even the shorter:
module_param(heartbeat, int, S_IRUGO);


This is a bit more descriptive - but still the same functionality.


> +module_param(nowayout, int, 0444);
ditto.


> +void octeon_wdt_nmi_stage3(uint64_t reg[32])
> +{
> +	uint64_t i;

The kernel version of this type is "u64".
We usually say that the stdint types belongs to userspace.
But it is used in many places so no big deal.

Note: you use stdint types in several places,
but there is no need to repeat the comment.

	Sam
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