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[222.152.170.159]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-141387c6f95sm4911356c88.6.2026.08.13.20.17.54 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 13 Aug 2026 20:17:55 -0700 (PDT) Received: by xplor.waratah.dyndns.org (Postfix, from userid 1000) id 5783E360445; Fri, 14 Aug 2026 15:17:51 +1200 (NZST) From: Michael Schmitz To: linux-m68k@vger.kernel.org, geert@linux-m68k.org Cc: schmitzmic@gmail.com, Miro Kropacek Subject: [PATCH 1/5] m68k: Fix atari mouse movement Date: Fri, 14 Aug 2026 15:17:41 +1200 Message-Id: <20260814031745.17140-2-schmitzmic@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20260814031745.17140-1-schmitzmic@gmail.com> References: <20260814031745.17140-1-schmitzmic@gmail.com> Precedence: bulk X-Mailing-List: linux-m68k@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: From: Miro Kropacek Kernels are built with -funsigned-char since version 6.2, resulting in signed mouse position deltas getting misinterpreted as unsigned. Cast deltas passed in (unsigned) scancode buffer to correctly interpret sign. Fixes: 3bc753c06dd02a35 ("kbuild: treat char as always unsigned") Link: https://lists.debian.org/debian-68k/2026/08/msg00000.html Signed-off-by: Miro Kropacek Reviewed-by: Michael Schmitz --- drivers/input/mouse/atarimouse.c | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-) diff --git a/drivers/input/mouse/atarimouse.c b/drivers/input/mouse/atarimouse.c index b1219cc4d9a2..351aab69e905 100644 --- a/drivers/input/mouse/atarimouse.c +++ b/drivers/input/mouse/atarimouse.c @@ -70,9 +70,12 @@ static void atamouse_interrupt(char *buf) atari_mouse_buttons = buttons; #endif - /* only relative events get here */ - dx = buf[1]; - dy = buf[2]; + /* only relative events get here; the IKBD sends signed 8-bit + * deltas, and the kernel builds with -funsigned-char since 6.2, + * so an explicit signed cast is required + */ + dx = (s8)buf[1]; + dy = (s8)buf[2]; input_report_rel(atamouse_dev, REL_X, dx); input_report_rel(atamouse_dev, REL_Y, dy); -- 2.17.1