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Sun, 12 Apr 2026 23:09:23 -0700 (PDT) MIME-Version: 1.0 References: <20260412173317.3329-1-mzndmzn@gmail.com> <20260412173317.3329-2-mzndmzn@gmail.com> <2026041338-guiding-concur-3831@gregkh> In-Reply-To: <2026041338-guiding-concur-3831@gregkh> From: Andy Shevchenko Date: Mon, 13 Apr 2026 09:08:47 +0300 X-Gm-Features: AQROBzBRxOFTl4Y0hRK_IfrGAfpqN1gBxS94tU4qKCixCJahw8eu990-6JlRl2s Message-ID: Subject: Re: [PATCH v3] staging: fbtft: replace empty macro args with identity converter To: Greg KH Cc: Baker , andy@kernel.org, dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On Mon, Apr 13, 2026 at 9:03=E2=80=AFAM Greg KH wrote: > On Mon, Apr 13, 2026 at 08:58:50AM +0300, Andy Shevchenko wrote: > > On Sun, Apr 12, 2026 at 8:33=E2=80=AFPM Baker wrote= : > > > > > > The define_fbtft_write_reg macro calls 'modifier' as a function. > > > Passing an empty token as modifier is undefined behavior in C for > > > fixed-arity macros. Introduce fbtft_no_conv() as an identity > > > function to replace the empty args in the no-conversion cases. > > > > This trick is used in the kernel (usually for u8). If you really want > > to improve, use _Generic() instead. > > No, sorry, this code is fine as-is. Works for me. I suggested they explore the possibilities, it might be helpful somewhere else in case of the similar requirements (like in a new code). --=20 With Best Regards, Andy Shevchenko