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[2403:580a:80ed:0:4835:5a07:49e7:f115]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-29bce470347sm41643525ad.41.2025.11.28.02.36.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 28 Nov 2025 02:37:05 -0800 (PST) From: James Calligeros To: Lee Jones Cc: Sven Peter , Janne Grunau , Alyssa Rosenzweig , Neal Gompa , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Alexandre Belloni , Jean Delvare , Guenter Roeck , Dmitry Torokhov , Jonathan Corbet , asahi@lists.linux.dev, linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-rtc@vger.kernel.org, linux-hwmon@vger.kernel.org, linux-input@vger.kernel.org, linux-doc@vger.kernel.org Subject: Re: [PATCH v5 05/11] mfd: macsmc: Add new __SMC_KEY macro Date: Fri, 28 Nov 2025 20:36:56 +1000 Message-ID: <1938104.tdWV9SEqCh@setsuna> In-Reply-To: <20251120134445.GC661940@google.com> References: <20251112-macsmc-subdevs-v5-0-728e4b91fe81@gmail.com> <20251112-macsmc-subdevs-v5-5-728e4b91fe81@gmail.com> <20251120134445.GC661940@google.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" On Thursday, 20 November 2025 11:44:45=E2=80=AFpm Australian Eastern Standa= rd Time Lee=20 Jones wrote: > On Wed, 12 Nov 2025, James Calligeros wrote: > > When using the _SMC_KEY macro in switch/case statements, GCC 15.2.1 err= ors > > out with 'case label does not reduce to an integer constant'. Introduce > > a new __SMC_KEY macro that can be used instead. > >=20 > > Signed-off-by: James Calligeros > > --- > >=20 > > include/linux/mfd/macsmc.h | 1 + > > 1 file changed, 1 insertion(+) > >=20 > > diff --git a/include/linux/mfd/macsmc.h b/include/linux/mfd/macsmc.h > > index 6b13f01a8592..f6f80c33b5cf 100644 > > --- a/include/linux/mfd/macsmc.h > > +++ b/include/linux/mfd/macsmc.h > > @@ -41,6 +41,7 @@ typedef u32 smc_key; > >=20 > > */ > > =20 > > #define SMC_KEY(s) (smc_key)(_SMC_KEY(#s)) > > #define _SMC_KEY(s) (((s)[0] << 24) | ((s)[1] << 16) | ((s)[2] << 8) | > > (s)[3])>=20 > > +#define __SMC_KEY(a, b, c, d) (((u32)(a) << 24) | ((u32)(b) << 16) | > > ((u32)(c) << 8) | ((u32)(d))) > Are we expecting users/consumers to be able to tell the difference > between SMC_KEY and __SMC_KEY (assuming that _SMC_KEY is just an > internal)? _SMC_KEY is used in the gpio driver, and I would have used it here too if n= ot=20 for GCC complaining about it. I wouldn't expect anyone to want to use=20 __SMC_KEY outside of the specific use case this commit addresses given the= =20 suboptimal ergonomics. > I have not tested this and it is just off the top of my head, but does > this work: >=20 > #define _SMC_KEY(s) __SMC_KEY((s)[0], (s)[1], (s)[2], (s)[3]) This works fine on a smattering of M1 and M2 series machines. I can submit = a=20 v6 with this and the hwmon driver dropped if need be. Regards, James