Date:   Mon, 15 Nov 2021 13:21:24 +0100
From:   Krzysztof =?utf-8?Q?Wilczy=C5=84ski?= <kw@linux.com>
To:     Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc:     bcm-kernel-feedback-list@broadcom.com,
        linux-rpi-kernel@lists.infradead.org,
        linux-arm-kernel@lists.infradead.org, linux-pci@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Nicolas Saenz Julienne <nsaenz@kernel.org>,
        Jim Quinlan <jim2101024@gmail.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Rob Herring <robh@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>
Subject: Re: [PATCH v1 1/1] PCI: brcmstb: Use GENMASK() as __GENMASK() is for
 internal use only
Message-ID: <YZJQxLkXgvZGkZYl@rocinante>
References: <20211027093433.4832-1-andriy.shevchenko@linux.intel.com>
 <YXkjMO0ULRGqZPbr@rocinante>
 <YXkphydcdD9giKqs@smile.fi.intel.com>
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In-Reply-To: <YXkphydcdD9giKqs@smile.fi.intel.com>
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Hi Andy,

> On Wed, Oct 27, 2021 at 12:00:16PM +0200, Krzysztof Wilczyński wrote:
> > > Use GENMASK() as __GENMASK() is for internal use only.
> >
> > To add, for posterity, that using __GENMASK() bypasses the
> > GENMASK_INPUT_CHECK() macro that adds extra validation.
>
> In general, yes, but here we have a variable...
>
> > > - u32 val = __GENMASK(31, msi->legacy_shift);
> > > + u32 val = GENMASK(31, msi->legacy_shift);
>
> ...which make me thing that the whole construction is ugly
> (and I truly believe the code is very ugly here, because
>  the idea behind GENMASK() is to be used with constants).
>
> So, what about
>
>       u32 val = ~(BIT(msi->legacy_shift) - 1);
>
> instead?

Sorry for late reply!  Thankfully, you've sent a v2 using the BIT() macro
already.  Thank you!

	Krzysztof