linux-kernel - Re: [PATCH] checkpatch: Suggest using min_t or max

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Date:	Tue, 24 May 2011 16:35:03 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Joe Perches <joe@...ches.com>
Cc:	Andy Whitcroft <apw@...onical.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] checkpatch: Suggest using min_t or max_t

On Fri, 20 May 2011 13:24:48 -0700
Joe Perches <joe@...ches.com> wrote:

> A common issue with min() or max() is using a cast on
> one or both of the arguments when using min_t/max_t could
> be better.
> 
> Add cast detection to uses of min/max and suggest an
> appropriate use of min_t or max_t instead.

Causes this:

akpm2:/usr/src/25> perl scripts/checkpatch.pl patches/drivers-gpio-vx855_gpioc-needs-slabh.patch
Nested quantifiers in regex; marked by <-- HERE in m/(\((?:[^\(\)]++ <-- HERE |(?-1))*\))/ at scripts/checkpatch.pl line 271.

with this:

From: Andrew Morton <akpm@...ux-foundation.org>

alpha allmodconfig:

drivers/gpio/vx855_gpio.c: In function 'vx855gpio_probe':
drivers/gpio/vx855_gpio.c:233: error: implicit declaration of function 'kzalloc'
drivers/gpio/vx855_gpio.c:233: warning: assignment makes pointer from integer without a cast

Cc: Grant Likely <grant.likely@...retlab.ca>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 drivers/gpio/vx855_gpio.c |    1 +
 1 file changed, 1 insertion(+)

diff -puN drivers/gpio/vx855_gpio.c~drivers-gpio-vx855_gpioc-needs-slabh drivers/gpio/vx855_gpio.c
--- a/drivers/gpio/vx855_gpio.c~drivers-gpio-vx855_gpioc-needs-slabh
+++ a/drivers/gpio/vx855_gpio.c
@@ -26,6 +26,7 @@
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/gpio.h>
+#include <linux/slab.h>
 #include <linux/device.h>
 #include <linux/platform_device.h>
 #include <linux/pci.h>
_

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