linux-kernel - Re: [PATCH v1 1/4] platform/x86: intel_pmc

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Message-ID: <20190409173939.GY9224@smile.fi.intel.com>
Date:   Tue, 9 Apr 2019 20:39:39 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     sathyanarayanan kuppuswamy 
        <sathyanarayanan.kuppuswamy@...ux.intel.com>
Cc:     Darren Hart <dvhart@...radead.org>,
        platform-driver-x86@...r.kernel.org,
        Zha Qipeng <qipeng.zha@...el.com>, junxiao.chang@...el.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 1/4] platform/x86: intel_pmc_ipc: Use BIT() macro

On Tue, Apr 09, 2019 at 10:07:35AM -0700, sathyanarayanan kuppuswamy wrote:
> On 4/9/19 4:25 AM, Andy Shevchenko wrote:
> > Use BIT() and BIT_MASK() macros for definitions.
> Looks good to me.

Thanks!

> >   /* PMC register bit definitions */
> >   /* PMC_CFG_REG bit masks */
> > -#define PMC_CFG_NO_REBOOT_MASK		(1 << 4)
> > +#define PMC_CFG_NO_REBOOT_MASK		BIT_MASK(4)
> >   #define PMC_CFG_NO_REBOOT_EN		(1 << 4)
> >   #define PMC_CFG_NO_REBOOT_DIS		(0 << 4)
> Do we need 0 << 4 ?

Yes, to explicitly show that this is a value for NO_REBOOT masked bit(s)
(single bit in this case).

-- 
With Best Regards,
Andy Shevchenko