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Tue, 16 Nov 2021 12:41:30 -0800 (PST) Received: from [10.67.48.245] ([192.19.223.252]) by smtp.gmail.com with ESMTPSA id h196sm2953502pfe.216.2021.11.16.12.41.29 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 16 Nov 2021 12:41:29 -0800 (PST) Subject: Re: [PATCH v2 1/1] PCI: brcmstb: Use BIT() as __GENMASK() is for internal use only To: Rob Herring , Andy Shevchenko , Marc Zyngier Cc: Robin Murphy , bcm-kernel-feedback-list , linux-rpi-kernel , linux-arm Mailing List , linux-pci , Linux Kernel Mailing List , Jim Quinlan , Nicolas Saenz Julienne , Florian Fainelli , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= , Bjorn Helgaas References: <20211115112000.23693-1-andriy.shevchenko@linux.intel.com> <94d3f4e5-a698-134c-8264-55d31d3eafa6@arm.com> From: Florian Fainelli Message-ID: <71a90592-99bb-13e1-a671-eb19c2dad3da@broadcom.com> Date: Tue, 16 Nov 2021 12:41:28 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Thunderbird/78.13.0 MIME-Version: 1.0 In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20211116_124132_519244_6BB1C38B X-CRM114-Status: GOOD ( 19.11 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: multipart/mixed; boundary="===============8204628956153233495==" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org --===============8204628956153233495== Content-Type: multipart/signed; protocol="application/pkcs7-signature"; micalg=sha-256; boundary="00000000000047369505d0edf303" --00000000000047369505d0edf303 Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit On 11/16/21 10:20 AM, Rob Herring wrote: > +Marc Z > > On Mon, Nov 15, 2021 at 8:39 AM Andy Shevchenko > wrote: >> >> On Mon, Nov 15, 2021 at 04:14:21PM +0200, Andy Shevchenko wrote: >>> On Mon, Nov 15, 2021 at 4:01 PM Robin Murphy wrote: >>>> On 2021-11-15 11:20, Andy Shevchenko wrote: >>>>> Use BIT() as __GENMASK() is for internal use only. The rationale >>>>> of switching to BIT() is to provide better generated code. The >>>>> GENMASK() against non-constant numbers may produce an ugly assembler >>>>> code. On contrary the BIT() is simply converted to corresponding shift >>>>> operation. >>>> >>>> FWIW, If you care about code quality and want the compiler to do the >>>> obvious thing, why not specify it as the obvious thing: >>>> >>>> u32 val = ~0 << msi->legacy_shift; >>> >>> Obvious and buggy (from the C standard point of view)? :-) >> >> Forgot to mention that BIT() is also makes it easy to avoid such mistake. >> >>>> Personally I don't think that abusing BIT() in the context of setting >>>> multiple bits is any better than abusing __GENMASK()... >>> >>> No, BIT() is not abused here, but __GENMASK(). >>> >>> After all it's up to you, folks, consider that as a bug report. > > Couldn't we get rid of legacy_shift entirely if the legacy case sets > up 'hwirq' as 24-31 rather than 0-7? Though the data for the MSI msg > uses the hwirq. I personally find it clearer and easier to reason about with the current code though I suppose that with an appropriate xlate method we could sort of set up the hwirq the way we want them to be to avoid any shifting in brcm_pcie_msi_isr(). -- Florian --00000000000047369505d0edf303 Content-Type: application/pkcs7-signature; name="smime.p7s" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="smime.p7s" Content-Description: S/MIME Cryptographic Signature MIIQeQYJKoZIhvcNAQcCoIIQajCCEGYCAQExDzANBglghkgBZQMEAgEFADALBgkqhkiG9w0BBwGg gg3QMIIFDTCCA/WgAwIBAgIQeEqpED+lv77edQixNJMdADANBgkqhkiG9w0BAQsFADBMMSAwHgYD VQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEGA1UEChMKR2xvYmFsU2lnbjETMBEGA1UE AxMKR2xvYmFsU2lnbjAeFw0yMDA5MTYwMDAwMDBaFw0yODA5MTYwMDAwMDBaMFsxCzAJBgNVBAYT AkJFMRkwFwYDVQQKExBHbG9iYWxTaWduIG52LXNhMTEwLwYDVQQDEyhHbG9iYWxTaWduIEdDQyBS MyBQZXJzb25hbFNpZ24gMiBDQSAyMDIwMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEA 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