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Sun, 12 Apr 2026 10:33:29 -0700 (PDT) From: Baker To: andy@kernel.org, gregkh@linuxfoundation.org Cc: dri-devel@lists.freedesktop.org, linux-fbdev@vger.kernel.org, linux-staging@lists.linux.dev, linux-kernel@vger.kernel.org, Baker Subject: [PATCH v3] staging: fbtft: replace empty macro args with identity converter Date: Sun, 12 Apr 2026 12:33:17 -0500 Message-ID: <20260412173317.3329-2-mzndmzn@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260412173317.3329-1-mzndmzn@gmail.com> References: <20260412173317.3329-1-mzndmzn@gmail.com> Precedence: bulk X-Mailing-List: linux-staging@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 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. Signed-off-by: Baker --- drivers/staging/fbtft/fbtft-bus.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/staging/fbtft/fbtft-bus.c b/drivers/staging/fbtft/fbtft-bus.c index 30e436ff19e4..7f3fd30576ab 100644 --- a/drivers/staging/fbtft/fbtft-bus.c +++ b/drivers/staging/fbtft/fbtft-bus.c @@ -11,6 +11,8 @@ * *****************************************************************************/ +#define fbtft_no_conv(x) (x) + #define define_fbtft_write_reg(func, buffer_type, data_type, modifier) \ void func(struct fbtft_par *par, int len, ...) \ { \ @@ -62,9 +64,9 @@ out: \ } \ EXPORT_SYMBOL(func); -define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, ) +define_fbtft_write_reg(fbtft_write_reg8_bus8, u8, u8, fbtft_no_conv) define_fbtft_write_reg(fbtft_write_reg16_bus8, __be16, u16, cpu_to_be16) -define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, ) +define_fbtft_write_reg(fbtft_write_reg16_bus16, u16, u16, fbtft_no_conv) void fbtft_write_reg8_bus9(struct fbtft_par *par, int len, ...) { -- 2.47.3