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Message-ID: <20251030151428.3c1f11ea@canb.auug.org.au>
Date: Thu, 30 Oct 2025 15:14:28 +1100
From: Stephen Rothwell <sfr@...b.auug.org.au>
To: Lee Jones <lee@...nel.org>, Simona Vetter <simona.vetter@...ll.ch>
Cc: Thomas Zimmermann <tzimmermann@...e.de>, Kaustabh Chakraborty
<kauschluss@...root.org>, Neil Armstrong <neil.armstrong@...aro.org>, Intel
Graphics <intel-gfx@...ts.freedesktop.org>, DRI
<dri-devel@...ts.freedesktop.org>, Linux Kernel Mailing List
<linux-kernel@...r.kernel.org>, Linux Next Mailing List
<linux-next@...r.kernel.org>
Subject: linux-next: manual merge of the backlight tree with the drm-misc
tree
Hi all,
After merging the backlight tree, today's linux-next build (x86_64
allmodconfig) failed like this:
drivers/gpu/drm/panel/panel-synaptics-tddi.c:41:41: error: array type has incomplete element type 'struct regulator_bulk_data'
41 | static const struct regulator_bulk_data tddi_supplies[] = {
| ^~~~~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c: In function 'tddi_prepare':
drivers/gpu/drm/panel/panel-synaptics-tddi.c:72:15: error: implicit declaration of function 'regulator_bulk_enable' [-Wimplicit-function-declaration]
72 | ret = regulator_bulk_enable(ARRAY_SIZE(tddi_supplies), ctx->supplies);
| ^~~~~~~~~~~~~~~~~~~~~
In file included from include/linux/dev_printk.h:14,
from include/linux/device.h:15,
from include/linux/backlight.h:12,
from drivers/gpu/drm/panel/panel-synaptics-tddi.c:8:
include/linux/compiler.h:201:82: error: expression in static assertion is not an integer
201 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
| ^
include/linux/compiler.h:206:33: note: in expansion of macro '__BUILD_BUG_ON_ZERO_MSG'
206 | #define __must_be_array(a) __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/array_size.h:11:59: note: in expansion of macro '__must_be_array'
11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
| ^~~~~~~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c:72:37: note: in expansion of macro 'ARRAY_SIZE'
72 | ret = regulator_bulk_enable(ARRAY_SIZE(tddi_supplies), ctx->supplies);
| ^~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c: In function 'tddi_unprepare':
drivers/gpu/drm/panel/panel-synaptics-tddi.c:101:9: error: implicit declaration of function 'regulator_bulk_disable' [-Wimplicit-function-declaration]
101 | regulator_bulk_disable(ARRAY_SIZE(tddi_supplies), ctx->supplies);
| ^~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:201:82: error: expression in static assertion is not an integer
201 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
| ^
include/linux/compiler.h:206:33: note: in expansion of macro '__BUILD_BUG_ON_ZERO_MSG'
206 | #define __must_be_array(a) __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/array_size.h:11:59: note: in expansion of macro '__must_be_array'
11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
| ^~~~~~~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c:101:32: note: in expansion of macro 'ARRAY_SIZE'
101 | regulator_bulk_disable(ARRAY_SIZE(tddi_supplies), ctx->supplies);
| ^~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c: In function 'tddi_probe':
drivers/gpu/drm/panel/panel-synaptics-tddi.c:183:15: error: implicit declaration of function 'devm_regulator_bulk_get_const' [-Wimplicit-function-declaration]
183 | ret = devm_regulator_bulk_get_const(dev, ARRAY_SIZE(tddi_supplies),
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
include/linux/compiler.h:201:82: error: expression in static assertion is not an integer
201 | #define __BUILD_BUG_ON_ZERO_MSG(e, msg, ...) ((int)sizeof(struct {_Static_assert(!(e), msg);}))
| ^
include/linux/compiler.h:206:33: note: in expansion of macro '__BUILD_BUG_ON_ZERO_MSG'
206 | #define __must_be_array(a) __BUILD_BUG_ON_ZERO_MSG(!__is_array(a), \
| ^~~~~~~~~~~~~~~~~~~~~~~
include/linux/array_size.h:11:59: note: in expansion of macro '__must_be_array'
11 | #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
| ^~~~~~~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c:183:50: note: in expansion of macro 'ARRAY_SIZE'
183 | ret = devm_regulator_bulk_get_const(dev, ARRAY_SIZE(tddi_supplies),
| ^~~~~~~~~~
drivers/gpu/drm/panel/panel-synaptics-tddi.c: At top level:
drivers/gpu/drm/panel/panel-synaptics-tddi.c:41:41: error: 'tddi_supplies' defined but not used [-Werror=unused-variable]
41 | static const struct regulator_bulk_data tddi_supplies[] = {
| ^~~~~~~~~~~~~
cc1: all warnings being treated as errors
Caused by commit
243ce64b2b37 ("backlight: Do not include <linux/fb.h> in header file")
interacting with commit
3eae82503f4f ("drm: panel: add support for Synaptics TDDI series DSI panels")
from the drm-misc tree.
I have applied the following merge fix patch. It (or something linke it)
should be applied to the drm-misc tree.
From: Stephen Rothwell <sfr@...b.auug.org.au>
Date: Thu, 30 Oct 2025 14:57:03 +1100
Subject: [PATCH] fix up for "backlight: Do not include <linux/fb.h> in header file"
interacting with commit
3eae82503f4f ("drm: panel: add support for Synaptics TDDI series DSI panels")
from the drm-misc tree.
Signed-off-by: Stephen Rothwell <sfr@...b.auug.org.au>
---
drivers/gpu/drm/panel/panel-synaptics-tddi.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/drivers/gpu/drm/panel/panel-synaptics-tddi.c b/drivers/gpu/drm/panel/panel-synaptics-tddi.c
index a4b3cbdebb6c..0aea1854710e 100644
--- a/drivers/gpu/drm/panel/panel-synaptics-tddi.c
+++ b/drivers/gpu/drm/panel/panel-synaptics-tddi.c
@@ -9,6 +9,7 @@
#include <linux/gpio/consumer.h>
#include <linux/module.h>
#include <linux/of.h>
+#include <linux/regulator/consumer.h>
#include <video/mipi_display.h>
--
2.51.1
--
Cheers,
Stephen Rothwell
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