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From: Anson Huang <anson.huang@nxp.com>
To: Randy Dunlap <rdunlap@infradead.org>,
	"mturquette@baylibre.com" <mturquette@baylibre.com>,
	"sboyd@kernel.org" <sboyd@kernel.org>,
	"shawnguo@kernel.org" <shawnguo@kernel.org>,
	"s.hauer@pengutronix.de" <s.hauer@pengutronix.de>,
	"kernel@pengutronix.de" <kernel@pengutronix.de>,
	"festevam@gmail.com" <festevam@gmail.com>,
	Aisheng Dong <aisheng.dong@nxp.com>,
	"arnd@arndb.de" <arnd@arndb.de>, Peng Fan <peng.fan@nxp.com>,
	Abel Vesa <abel.vesa@nxp.com>, Andy Duan <fugang.duan@nxp.com>,
	Daniel Baluta <daniel.baluta@nxp.com>,
	"yuehaibing@huawei.com" <yuehaibing@huawei.com>,
	"linux-clk@vger.kernel.org" <linux-clk@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-arm-kernel@lists.infradead.org" 
	<linux-arm-kernel@lists.infradead.org>
Cc: dl-linux-imx <linux-imx@nxp.com>
Subject: RE: [PATCH V7 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed 32-bit value by 31 bits
Date: Thu, 30 Jul 2020 01:14:08 +0000
Message-ID: <DB3PR0402MB3916E18C8B36010D60086EA2F5710@DB3PR0402MB3916.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <34161e5c-0e83-97de-3cb6-1040d8abdc71@infradead.org>

Hi, Randy


> Subject: Re: [PATCH V7 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed
> 32-bit value by 31 bits
> 
> On 7/29/20 4:51 PM, Anson Huang wrote:
> > Hi, Randy
> >
> >
> >> Subject: Re: [PATCH V7 1/6] clk: imx6sl: Use BIT(x) to avoid shifting
> >> signed 32-bit value by 31 bits
> >>
> >> On 7/29/20 7:48 AM, Anson Huang wrote:
> >>> Use readl_relaxed() instead of __raw_readl(), and use BIT(x) instead
> >>> of (1 << X) to fix below build warning reported by kernel test robot:
> >>>
> >>> drivers/clk/imx/clk-imx6sl.c:149:49: warning: Shifting signed 32-bit
> >>> value by 31 bits is undefined behaviour [shiftTooManyBitsSigned]
> >>>      while (!(__raw_readl(anatop_base + PLL_ARM) &
> >> BM_PLL_ARM_LOCK))
> >>>
> >>> Signed-off-by: Anson Huang <Anson.Huang@nxp.com>
> >>> Reported-by: kernel test robot <lkp@intel.com>
> >>> ---
> >>> Changes since V6:
> >>> 	- improve the subject.
> >>> ---
> >>>  drivers/clk/imx/clk-imx6sl.c | 15 ++++++++-------
> >>>  1 file changed, 8 insertions(+), 7 deletions(-)
> >>>
> >>> diff --git a/drivers/clk/imx/clk-imx6sl.c
> >>> b/drivers/clk/imx/clk-imx6sl.c index 0f647d1..e69dba1 100644
> >>> --- a/drivers/clk/imx/clk-imx6sl.c
> >>> +++ b/drivers/clk/imx/clk-imx6sl.c
> >>> @@ -3,6 +3,7 @@
> >>>   * Copyright 2013-2014 Freescale Semiconductor, Inc.
> >>>   */
> >>>
> >>> +#include <linux/bitfield.h>
> >>
> >> Hi,
> >> I think you want
> >> #include <linux/bits.h>
> >>
> >> for BIT() usage.
> >
> > Actually, the linux/of.h already includes linux/bitops.h and
> > linux/bitops.h includes linux/bits.h, so I will just drop linux/bitfield.h and
> send a V8.
> 
> or you could read Documentation/process/submit-checklist.rst,
> where rule #1 says:
> 
> 1) If you use a facility then #include the file that defines/declares
>    that facility.  Don't depend on other header files pulling in ones
>    that you use.

Understood, while I search "BIT()" in clk driver, most of the drivers does NOT include
linux/bits.h even they use it.

But OK, I will send V9 to include it.

Thanks,
Anson





  reply index

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-07-29 14:48 [PATCH V7 0/6] Support building i.MX ARMv8 platforms clock driver as module Anson Huang
2020-07-29 14:48 ` [PATCH V7 1/6] clk: imx6sl: Use BIT(x) to avoid shifting signed 32-bit value by 31 bits Anson Huang
2020-07-29 15:49   ` Randy Dunlap
2020-07-29 23:51     ` Anson Huang
2020-07-30  0:30       ` Randy Dunlap
2020-07-30  1:14         ` Anson Huang [this message]
2020-07-30  7:25           ` Arnd Bergmann
2020-07-29 14:48 ` [PATCH V7 2/6] clk: composite: Export clk_hw_register_composite() Anson Huang
2020-07-29 14:48 ` [PATCH V7 3/6] clk: imx: Support building i.MX common clock driver as module Anson Huang
2020-07-29 14:48 ` [PATCH V7 4/6] clk: imx: Add clock configuration for ARMv7 platforms Anson Huang
2020-07-29 14:48 ` [PATCH V7 5/6] clk: imx8m: Support module build Anson Huang
2020-07-29 14:48 ` [PATCH V7 6/6] clk: imx8qxp: Support building i.MX8QXP clock driver as module Anson Huang
2020-07-29 15:26 ` [PATCH V7 0/6] Support building i.MX ARMv8 platforms " Shawn Guo
2020-08-01  0:04   ` Stephen Boyd

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