linux-kernel - [PATCH AUTOSEL 6.12 026/107] drm/display: Fix building with GCC 15

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Message-ID: <20241124133301.3341829-26-sashal@kernel.org>
Date: Sun, 24 Nov 2024 08:28:46 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Brahmajit Das <brahmajit.xyz@...il.com>,
	Jani Nikula <jani.nikula@...el.com>,
	Sasha Levin <sashal@...nel.org>,
	maarten.lankhorst@...ux.intel.com,
	mripard@...nel.org,
	tzimmermann@...e.de,
	airlied@...il.com,
	simona@...ll.ch,
	dmitry.baryshkov@...aro.org,
	oleksandr@...alenko.name,
	rdunlap@...radead.org,
	dri-devel@...ts.freedesktop.org
Subject: [PATCH AUTOSEL 6.12 026/107] drm/display: Fix building with GCC 15

From: Brahmajit Das <brahmajit.xyz@...il.com>

[ Upstream commit a500f3751d3c861be7e4463c933cf467240cca5d ]

GCC 15 enables -Werror=unterminated-string-initialization by default.
This results in the following build error

drivers/gpu/drm/display/drm_dp_dual_mode_helper.c: In function ‘is_hdmi_adaptor’:
drivers/gpu/drm/display/drm_dp_dual_mode_helper.c:164:17: error: initializer-string for array of
 ‘char’ is too long [-Werror=unterminated-string-initialization]
  164 |                 "DP-HDMI ADAPTOR\x04";
      |                 ^~~~~~~~~~~~~~~~~~~~~

After discussion with Ville, the fix was to increase the size of
dp_dual_mode_hdmi_id array by one, so that it can accommodate the NULL
line character. This should let us build the kernel with GCC 15.

Signed-off-by: Brahmajit Das <brahmajit.xyz@...il.com>
Reviewed-by: Jani Nikula <jani.nikula@...el.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241002092311.942822-1-brahmajit.xyz@gmail.com
Signed-off-by: Jani Nikula <jani.nikula@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/display/drm_dp_dual_mode_helper.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c b/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
index 14a2a8473682b..c491e3203bf11 100644
--- a/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
+++ b/drivers/gpu/drm/display/drm_dp_dual_mode_helper.c
@@ -160,11 +160,11 @@ EXPORT_SYMBOL(drm_dp_dual_mode_write);
 
 static bool is_hdmi_adaptor(const char hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN])
 {
-	static const char dp_dual_mode_hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN] =
+	static const char dp_dual_mode_hdmi_id[DP_DUAL_MODE_HDMI_ID_LEN + 1] =
 		"DP-HDMI ADAPTOR\x04";
 
 	return memcmp(hdmi_id, dp_dual_mode_hdmi_id,
-		      sizeof(dp_dual_mode_hdmi_id)) == 0;
+		      DP_DUAL_MODE_HDMI_ID_LEN) == 0;
 }
 
 static bool is_type1_adaptor(uint8_t adaptor_id)
-- 
2.43.0