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From: Luca Weiss <luca@z3ntu.xyz>
To: Sakari Ailus <sakari.ailus@iki.fi>, Pavel Machek <pavel@ucw.cz>
Cc: linux-leds@vger.kernel.org, Dan Murphy <dmurphy@ti.com>,
	Heiko Stuebner <heiko@sntech.de>, Icenowy Zheng <icenowy@aosc.io>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Laurent Pinchart <laurent.pinchart@ideasonboard.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Maxime Ripard <mripard@kernel.org>,
	Rob Herring <robh+dt@kernel.org>, Shawn Guo <shawnguo@kernel.org>,
	devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
	~postmarketos/upstreaming@lists.sr.ht
Subject: Re: [PATCH 3/3] leds: add sgm3140 driver
Date: Mon, 09 Mar 2020 23:52:06 +0100	[thread overview]
Message-ID: <2804366.mvXUDI8C0e@g550jk> (raw)
In-Reply-To: <20200309224926.GA2917@duo.ucw.cz>

Hi Pavel

On Montag, 9. März 2020 23:49:27 CET Pavel Machek wrote:
> Hi!
> 
> > > +#define FLASH_TIMEOUT_DEFAULT		250000 /* 250ms */
> > > +#define FLASH_MAX_TIMEOUT_DEFAULT	300000 /* 300ms */
> > 
> > Add U, and you can remove the cast elsewhere.
> 
> I'll disagree here. Avoid U, avoid cast. Neither is needed.

If neither cast to u32 nor the U suffix is used, then this warning will be 
printed:

In file included from ./include/asm-generic/bug.h:19,
                 from ./arch/arm64/include/asm/bug.h:26,
                 from ./include/linux/bug.h:5,
                 from ./include/linux/gpio/consumer.h:5,
                 from drivers/leds/leds-sgm3140.c:4:
drivers/leds/leds-sgm3140.c: In function 'sgm3140_probe':
./include/linux/kernel.h:835:29: warning: comparison of distinct pointer types 
lacks a cast
  835 |   (!!(sizeof((typeof(x) *)1 == (typeof(y) *)1)))
      |                             ^~
./include/linux/kernel.h:849:4: note: in expansion of macro '__typecheck'
  849 |   (__typecheck(x, y) && __no_side_effects(x, y))
      |    ^~~~~~~~~~~
./include/linux/kernel.h:859:24: note: in expansion of macro '__safe_cmp'
  859 |  __builtin_choose_expr(__safe_cmp(x, y), \
      |                        ^~~~~~~~~~
./include/linux/kernel.h:868:19: note: in expansion of macro '__careful_cmp'
  868 | #define min(x, y) __careful_cmp(x, y, <)
      |                   ^~~~~~~~~~~~~
drivers/leds/leds-sgm3140.c:187:18: note: in expansion of macro 'min'
  187 |  priv->timeout = min(priv->max_timeout, FLASH_TIMEOUT_DEFAULT);
      |                  ^~~

So one of both is needed.

> 
> Best regards,
> 								
	Pavel

Regards
Luca



  reply	other threads:[~2020-03-09 22:52 UTC|newest]

Thread overview: 18+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-09 20:35 [PATCH 0/3] Add sgm3140 flash led driver Luca Weiss
2020-03-09 20:35 ` [PATCH 1/3] dt-bindings: Add vendor prefix for SG Micro Corp Luca Weiss
2020-03-23 20:54   ` Rob Herring
2020-03-09 20:35 ` [PATCH 2/3] dt-bindings: leds: Add binding for sgm3140 Luca Weiss
2020-03-09 22:22   ` Sakari Ailus
2020-03-11 12:49   ` Dan Murphy
2020-03-15 10:47     ` Luca Weiss
2020-03-15 10:53       ` Laurent Pinchart
2020-03-23 21:30         ` Dan Murphy
2020-03-23 20:57   ` Rob Herring
2020-03-24 20:02     ` Luca Weiss
2020-03-09 20:35 ` [PATCH 3/3] leds: add sgm3140 driver Luca Weiss
2020-03-09 22:18   ` Sakari Ailus
2020-03-09 22:49     ` Pavel Machek
2020-03-09 22:52       ` Luca Weiss [this message]
2020-03-11 13:02   ` Dan Murphy
2020-03-11 21:09     ` Jacek Anaszewski
2020-03-15 10:42     ` Luca Weiss

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