Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18;
Date:   Wed, 28 Jul 2021 17:16:36 -0500
From:   Bjorn Helgaas <helgaas@kernel.org>
To:     Shanker R Donthineni <sdonthineni@nvidia.com>
Cc:     Amey Narkhede <ameynarkhede03@gmail.com>,
        Bjorn Helgaas <bhelgaas@google.com>,
        alex.williamson@redhat.com,
        Raphael Norwitz <raphael.norwitz@nutanix.com>,
        linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
        kw@linux.com, Sinan Kaya <okaya@kernel.org>,
        Len Brown <lenb@kernel.org>,
        "Rafael J . Wysocki" <rjw@rjwysocki.net>
Subject: Re: [PATCH v10 1/8] PCI: Add pcie_reset_flr to follow calling
 convention of other reset methods
Message-ID: <20210728221636.GA858116@bjorn-Precision-5520>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <64a0049e-00dc-8b10-6c9a-0b270c0a181d@nvidia.com>
Precedence: bulk

On Wed, Jul 28, 2021 at 04:58:14PM -0500, Shanker R Donthineni wrote:
> On 7/28/21 3:23 PM, Bjorn Helgaas wrote:
> > On Wed, Jul 28, 2021 at 01:54:16PM -0500, Shanker R Donthineni wrote:
> >> On 7/27/21 5:12 PM, Bjorn Helgaas wrote:
> >>> On Fri, Jul 09, 2021 at 06:08:06PM +0530, Amey Narkhede wrote:
> >>>> Add has_pcie_flr bitfield in struct pci_dev to indicate support for PCIe
> >>>> FLR to avoid reading PCI_EXP_DEVCAP multiple times.

> >> -       pcie_capability_read_dword(dev, PCI_EXP_DEVCAP, &cap);
> >> -       return cap & PCI_EXP_DEVCAP_FLR;
> >> +       return !!FIELD_GET(PCI_EXP_DEVCAP_FLR, dev->devcap);
> >
> > Nice, thanks for reminding me of FIELD_GET().  I like how that works
> > without having to #define *_SHIFT values.  I personally don't care for
> > "!!" and would probably write something like:
> >
> >   return FIELD_GET(PCI_EXP_DEVCAP_FLR, dev->devcap) == 1;
> 
> Both are same since FLR is a single bit value.

Right; this is a style preference, not a correctness question.