Documentation/kbuild/kconfig-language.txt warns to use select with care, and in general use select only for non-visible symbols and for symbols with no dependencies, because select will force a symbol to a value without visiting the dependencies.
Select has become particularly problematic, interdependently, with the BACKLIGHT_CLASS_DEVICE and ACPI_VIDEO configs. For example: scripts/kconfig/conf --randconfig Kconfig KCONFIG_SEED=0x48312B00 warning: (DRM_RADEON && DRM_NOUVEAU && DRM_I915 && DRM_GMA500 && DRM_SHMOBILE && DRM_TILCDC && FB_BACKLIGHT && FB_MX3 && USB_APPLEDISPLAY && FB_OLPC_DCON && ASUS_LAPTOP && SONY_LAPTOP && THINKPAD_ACPI && EEEPC_LAPTOP && ACPI_CMPC && SAMSUNG_Q10) selects BACKLIGHT_CLASS_DEVICE which has unmet direct dependencies (HAS_IOMEM && BACKLIGHT_LCD_SUPPORT) warning: (DRM_RADEON && DRM_NOUVEAU && DRM_I915 && DRM_GMA500 && DRM_SHMOBILE && DRM_TILCDC && FB_BACKLIGHT && FB_MX3 && USB_APPLEDISPLAY && FB_OLPC_DCON && ASUS_LAPTOP && SONY_LAPTOP && THINKPAD_ACPI && EEEPC_LAPTOP && ACPI_CMPC && SAMSUNG_Q10) selects BACKLIGHT_CLASS_DEVICE which has unmet direct dependencies (HAS_IOMEM && BACKLIGHT_LCD_SUPPORT) With tristates it's possible to end up selecting FOO=y depending on BAR=m in the config, which gets discovered at build time, not config time, like reported in the thread referenced below. Do the following to fix the dependencies: * Depend on instead of select BACKLIGHT_CLASS_DEVICE everywhere. Drop select BACKLIGHT_LCD_SUPPORT in such cases, as it's a dependency of BACKLIGHT_CLASS_DEVICE. * Remove config FB_BACKLIGHT altogether, and replace it with a dependency on BACKLIGHT_CLASS_DEVICE. All configs selecting FB_BACKLIGHT select or depend on FB anyway, so we can simplify. * Depend on (ACPI && ACPI_VIDEO) || ACPI=n in several places instead of selecting ACPI_VIDEO and a number of its dependencies if ACPI is enabled. This is tied to backlight, as ACPI_VIDEO depends on BACKLIGHT_CLASS_DEVICE. * Replace a couple of select INPUT/VT with depends as it seemed to be necessary. Reference: http://lkml.kernel.org/r/CA+r1ZhhmT4DrWtf6MbRQo5EqXwx+LxCqh15Vsu_d9WpftLhnxw at mail.gmail.com Reported-by: Jim Davis <jim.epost at gmail.com> Cc: Randy Dunlap <rdunlap at infradead.org> Cc: David Airlie <airlied at linux.ie> Cc: Daniel Vetter <daniel.vetter at intel.com> Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org> Cc: Darren Hart <dvhart at infradead.org> Cc: Laurent Pinchart <laurent.pinchart at ideasonboard.com> Cc: Benjamin Herrenschmidt <benh at kernel.crashing.org> Cc: Jens Frederich <jfrederich at gmail.com> Cc: Daniel Drake <dsd at laptop.org> Cc: Jon Nettleton <jon.nettleton at gmail.com> Cc: Jean-Christophe Plagniol-Villard <plagnioj at jcrosoft.com> Cc: Tomi Valkeinen <tomi.valkeinen at ti.com> Signed-off-by: Jani Nikula <jani.nikula at intel.com> --- Sorry for the huge distribution; this is really quite hard to split up sensibly without breaking the build! --- drivers/gpu/drm/Kconfig | 2 +- drivers/gpu/drm/gma500/Kconfig | 4 +--- drivers/gpu/drm/i915/Kconfig | 9 ++------- drivers/gpu/drm/nouveau/Kconfig | 10 ++-------- drivers/gpu/drm/shmobile/Kconfig | 2 +- drivers/gpu/drm/tilcdc/Kconfig | 3 +-- drivers/macintosh/Kconfig | 2 +- drivers/platform/x86/Kconfig | 19 ++++++++----------- drivers/staging/olpc_dcon/Kconfig | 2 +- drivers/usb/misc/Kconfig | 3 +-- drivers/video/fbdev/Kconfig | 29 +++++++++++------------------ drivers/video/fbdev/core/fbsysfs.c | 8 ++++---- include/linux/fb.h | 2 +- include/uapi/linux/fb.h | 2 +- 14 files changed, 36 insertions(+), 61 deletions(-) diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index e3b4b0f02b3d..dc789d0e293c 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -99,6 +99,7 @@ config DRM_R128 config DRM_RADEON tristate "ATI Radeon" depends on DRM && PCI + depends on BACKLIGHT_CLASS_DEVICE || BACKLIGHT_CLASS_DEVICE=n select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT @@ -108,7 +109,6 @@ config DRM_RADEON select DRM_TTM select POWER_SUPPLY select HWMON - select BACKLIGHT_CLASS_DEVICE select INTERVAL_TREE select MMU_NOTIFIER help diff --git a/drivers/gpu/drm/gma500/Kconfig b/drivers/gpu/drm/gma500/Kconfig index 17f928ec84ea..a84d0a4fcc58 100644 --- a/drivers/gpu/drm/gma500/Kconfig +++ b/drivers/gpu/drm/gma500/Kconfig @@ -8,9 +8,7 @@ config DRM_GMA500 select DRM_KMS_FB_HELPER select DRM_TTM # GMA500 depends on ACPI_VIDEO when ACPI is enabled, just like i915 - select ACPI_VIDEO if ACPI - select BACKLIGHT_CLASS_DEVICE if ACPI - select INPUT if ACPI + depends on (ACPI && ACPI_VIDEO) || ACPI=n help Say yes for an experimental 2D KMS framebuffer driver for the Intel GMA500 ('Poulsbo') and other Intel IMG based graphics diff --git a/drivers/gpu/drm/i915/Kconfig b/drivers/gpu/drm/i915/Kconfig index 4e39ab34eb1c..75d4c52c0971 100644 --- a/drivers/gpu/drm/i915/Kconfig +++ b/drivers/gpu/drm/i915/Kconfig @@ -3,6 +3,8 @@ config DRM_I915 depends on DRM depends on X86 && PCI depends on (AGP || AGP=n) + depends on (ACPI && ACPI_VIDEO) || ACPI=n + depends on BACKLIGHT_CLASS_DEVICE || BACKLIGHT_CLASS_DEVICE=n select INTEL_GTT select AGP_INTEL if AGP select INTERVAL_TREE @@ -11,13 +13,6 @@ config DRM_I915 select SHMEM select TMPFS select DRM_KMS_HELPER - # i915 depends on ACPI_VIDEO when ACPI is enabled - # but for select to work, need to select ACPI_VIDEO's dependencies, ick - select BACKLIGHT_LCD_SUPPORT if ACPI - select BACKLIGHT_CLASS_DEVICE if ACPI - select INPUT if ACPI - select ACPI_VIDEO if ACPI - select ACPI_BUTTON if ACPI help Choose this option if you have a system that has "Intel Graphics Media Accelerator" or "HD Graphics" integrated graphics, diff --git a/drivers/gpu/drm/nouveau/Kconfig b/drivers/gpu/drm/nouveau/Kconfig index 40afc69a3778..40227fc4f284 100644 --- a/drivers/gpu/drm/nouveau/Kconfig +++ b/drivers/gpu/drm/nouveau/Kconfig @@ -1,6 +1,7 @@ config DRM_NOUVEAU tristate "Nouveau (NVIDIA) cards" depends on DRM && PCI + depends on (ACPI && ACPI_VIDEO) || ACPI=n select FW_LOADER select DRM_KMS_HELPER select DRM_KMS_FB_HELPER @@ -10,18 +11,10 @@ config DRM_NOUVEAU select FB_CFB_IMAGEBLIT select FB select FRAMEBUFFER_CONSOLE if !EXPERT - select FB_BACKLIGHT if DRM_NOUVEAU_BACKLIGHT - select ACPI_VIDEO if ACPI && X86 && BACKLIGHT_CLASS_DEVICE && INPUT select X86_PLATFORM_DEVICES if ACPI && X86 select ACPI_WMI if ACPI && X86 select MXM_WMI if ACPI && X86 select POWER_SUPPLY - # Similar to i915, we need to select ACPI_VIDEO and it's dependencies - select BACKLIGHT_LCD_SUPPORT if ACPI && X86 - select BACKLIGHT_CLASS_DEVICE if ACPI && X86 - select INPUT if ACPI && X86 - select THERMAL if ACPI && X86 - select ACPI_VIDEO if ACPI && X86 help Choose this option for open-source NVIDIA support. @@ -64,6 +57,7 @@ config NOUVEAU_DEBUG_DEFAULT config DRM_NOUVEAU_BACKLIGHT bool "Support for backlight control" depends on DRM_NOUVEAU + depends on BACKLIGHT_CLASS_DEVICE default y help Say Y here if you want to control the backlight of your display diff --git a/drivers/gpu/drm/shmobile/Kconfig b/drivers/gpu/drm/shmobile/Kconfig index a50fe0eeaa0d..71c00f3c0fbc 100644 --- a/drivers/gpu/drm/shmobile/Kconfig +++ b/drivers/gpu/drm/shmobile/Kconfig @@ -2,7 +2,7 @@ config DRM_SHMOBILE tristate "DRM Support for SH Mobile" depends on DRM && ARM depends on ARCH_SHMOBILE || COMPILE_TEST - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE select DRM_KMS_HELPER select DRM_KMS_FB_HELPER select DRM_KMS_CMA_HELPER diff --git a/drivers/gpu/drm/tilcdc/Kconfig b/drivers/gpu/drm/tilcdc/Kconfig index 7c3ef79fcb37..52e60feaae53 100644 --- a/drivers/gpu/drm/tilcdc/Kconfig +++ b/drivers/gpu/drm/tilcdc/Kconfig @@ -1,13 +1,12 @@ config DRM_TILCDC tristate "DRM Support for TI LCDC Display Controller" depends on DRM && OF && ARM + depends on BACKLIGHT_CLASS_DEVICE select DRM_KMS_HELPER select DRM_KMS_FB_HELPER select DRM_KMS_CMA_HELPER select DRM_GEM_CMA_HELPER select VIDEOMODE_HELPERS - select BACKLIGHT_CLASS_DEVICE - select BACKLIGHT_LCD_SUPPORT help Choose this option if you have an TI SoC with LCDC display controller, for example AM33xx in beagle-bone, DA8xx, or diff --git a/drivers/macintosh/Kconfig b/drivers/macintosh/Kconfig index 3067d56b11a6..50cb2c3b567e 100644 --- a/drivers/macintosh/Kconfig +++ b/drivers/macintosh/Kconfig @@ -135,7 +135,7 @@ config PMAC_MEDIABAY config PMAC_BACKLIGHT bool "Backlight control for LCD screens" depends on ADB_PMU && FB = y && (BROKEN || !PPC64) - select FB_BACKLIGHT + depends on BACKLIGHT_CLASS_DEVICE help Say Y here to enable Macintosh specific extensions of the generic backlight code. With this enabled, the brightness keys on older diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig index 4dcfb7116a04..63e99ce0e3f8 100644 --- a/drivers/platform/x86/Kconfig +++ b/drivers/platform/x86/Kconfig @@ -17,7 +17,7 @@ if X86_PLATFORM_DEVICES config ACER_WMI tristate "Acer WMI Laptop Extras" - depends on ACPI + depends on ACPI && ACPI_VIDEO select LEDS_CLASS select NEW_LEDS depends on BACKLIGHT_CLASS_DEVICE @@ -26,8 +26,6 @@ config ACER_WMI depends on RFKILL || RFKILL = n depends on ACPI_WMI select INPUT_SPARSEKMAP - # Acer WMI depends on ACPI_VIDEO when ACPI is enabled - select ACPI_VIDEO if ACPI ---help--- This is a driver for newer Acer (and Wistron) laptops. It adds wireless radio and bluetooth control, and on some laptops, @@ -70,7 +68,7 @@ config ASUS_LAPTOP depends on ACPI select LEDS_CLASS select NEW_LEDS - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE depends on INPUT depends on RFKILL || RFKILL = n select INPUT_SPARSEKMAP @@ -294,7 +292,7 @@ config COMPAL_LAPTOP config SONY_LAPTOP tristate "Sony Laptop Extras" depends on ACPI - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE depends on INPUT depends on RFKILL ---help--- @@ -329,8 +327,7 @@ config THINKPAD_ACPI depends on ACPI depends on INPUT depends on RFKILL || RFKILL = n - select BACKLIGHT_LCD_SUPPORT - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE select HWMON select NVRAM select NEW_LEDS @@ -499,7 +496,7 @@ config EEEPC_LAPTOP depends on INPUT depends on RFKILL || RFKILL = n depends on HOTPLUG_PCI - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE select HWMON select LEDS_CLASS select NEW_LEDS @@ -675,8 +672,8 @@ config ACPI_CMPC tristate "CMPC Laptop Extras" depends on X86 && ACPI depends on RFKILL || RFKILL=n - select INPUT - select BACKLIGHT_CLASS_DEVICE + depends on INPUT + depends on BACKLIGHT_CLASS_DEVICE default n help Support for Intel Classmate PC ACPI devices, including some @@ -805,7 +802,7 @@ config INTEL_OAKTRAIL config SAMSUNG_Q10 tristate "Samsung Q10 Extras" depends on ACPI - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE ---help--- This driver provides support for backlight control on Samsung Q10 and related laptops, including Dell Latitude X200. diff --git a/drivers/staging/olpc_dcon/Kconfig b/drivers/staging/olpc_dcon/Kconfig index d277f048789e..94acb4279704 100644 --- a/drivers/staging/olpc_dcon/Kconfig +++ b/drivers/staging/olpc_dcon/Kconfig @@ -3,7 +3,7 @@ config FB_OLPC_DCON depends on OLPC && FB depends on I2C depends on (GPIO_CS5535 || GPIO_CS5535=n) - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE ---help--- In order to support very low power operation, the XO laptop uses a secondary Display CONtroller, or DCON. This secondary controller diff --git a/drivers/usb/misc/Kconfig b/drivers/usb/misc/Kconfig index 76d77206e011..824630b09662 100644 --- a/drivers/usb/misc/Kconfig +++ b/drivers/usb/misc/Kconfig @@ -150,8 +150,7 @@ config USB_FTDI_ELAN config USB_APPLEDISPLAY tristate "Apple Cinema Display support" - select BACKLIGHT_LCD_SUPPORT - select BACKLIGHT_CLASS_DEVICE + depends on BACKLIGHT_CLASS_DEVICE help Say Y here if you want to control the backlight of Apple Cinema Displays over USB. This driver provides a sysfs interface. diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig index ccbe2ae22ac5..8cae7da2c723 100644 --- a/drivers/video/fbdev/Kconfig +++ b/drivers/video/fbdev/Kconfig @@ -185,13 +185,6 @@ config FB_MACMODES depends on FB default n -config FB_BACKLIGHT - bool - depends on FB - select BACKLIGHT_LCD_SUPPORT - select BACKLIGHT_CLASS_DEVICE - default n - config FB_MODE_HELPERS bool "Enable Video Mode Handling Helpers" depends on FB @@ -323,7 +316,7 @@ config FB_CLPS711X tristate "CLPS711X LCD support" depends on FB && (ARCH_CLPS711X || COMPILE_TEST) select FB_CLPS711X_OLD if ARCH_CLPS711X && !ARCH_MULTIPLATFORM - select BACKLIGHT_LCD_SUPPORT + depends on BACKLIGHT_LCD_SUPPORT select FB_MODE_HELPERS select FB_SYS_FILLRECT select FB_SYS_COPYAREA @@ -351,7 +344,7 @@ config FB_SA1100 config FB_IMX tristate "Freescale i.MX1/21/25/27 LCD support" depends on FB && ARCH_MXC - select BACKLIGHT_LCD_SUPPORT + depends on BACKLIGHT_LCD_SUPPORT select LCD_CLASS_DEVICE select FB_CFB_FILLRECT select FB_CFB_COPYAREA @@ -674,7 +667,7 @@ config FB_STI select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT select STI_CONSOLE - select VT + depends on VT default y ---help--- STI refers to the HP "Standard Text Interface" which is a set of @@ -990,7 +983,7 @@ config FB_S1D13XXX config FB_ATMEL tristate "AT91/AT32 LCD Controller support" depends on FB && HAVE_FB_ATMEL - select FB_BACKLIGHT + depends on BACKLIGHT_CLASS_DEVICE select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT @@ -1019,7 +1012,6 @@ config FB_ATMEL_STN config FB_NVIDIA tristate "nVidia Framebuffer Support" depends on FB && PCI - select FB_BACKLIGHT if FB_NVIDIA_BACKLIGHT select FB_MODE_HELPERS select FB_CFB_FILLRECT select FB_CFB_COPYAREA @@ -1060,6 +1052,7 @@ config FB_NVIDIA_DEBUG config FB_NVIDIA_BACKLIGHT bool "Support for backlight control" depends on FB_NVIDIA + depends on BACKLIGHT_CLASS_DEVICE default y help Say Y here if you want to control the backlight of your display. @@ -1067,7 +1060,6 @@ config FB_NVIDIA_BACKLIGHT config FB_RIVA tristate "nVidia Riva support" depends on FB && PCI - select FB_BACKLIGHT if FB_RIVA_BACKLIGHT select FB_MODE_HELPERS select FB_CFB_FILLRECT select FB_CFB_COPYAREA @@ -1107,6 +1099,7 @@ config FB_RIVA_DEBUG config FB_RIVA_BACKLIGHT bool "Support for backlight control" depends on FB_RIVA + depends on BACKLIGHT_CLASS_DEVICE default y help Say Y here if you want to control the backlight of your display. @@ -1345,7 +1338,6 @@ config FB_MATROX_MAVEN config FB_RADEON tristate "ATI Radeon display support" depends on FB && PCI - select FB_BACKLIGHT if FB_RADEON_BACKLIGHT select FB_MODE_HELPERS select FB_CFB_FILLRECT select FB_CFB_COPYAREA @@ -1370,6 +1362,7 @@ config FB_RADEON_I2C config FB_RADEON_BACKLIGHT bool "Support for backlight control" depends on FB_RADEON + depends on BACKLIGHT_CLASS_DEVICE default y help Say Y here if you want to control the backlight of your display. @@ -1389,7 +1382,6 @@ config FB_ATY128 select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select FB_BACKLIGHT if FB_ATY128_BACKLIGHT select FB_MACMODES if PPC_PMAC help This driver supports graphics boards with the ATI Rage128 chips. @@ -1402,6 +1394,7 @@ config FB_ATY128 config FB_ATY128_BACKLIGHT bool "Support for backlight control" depends on FB_ATY128 + depends on BACKLIGHT_CLASS_DEVICE default y help Say Y here if you want to control the backlight of your display. @@ -1412,7 +1405,6 @@ config FB_ATY select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select FB_BACKLIGHT if FB_ATY_BACKLIGHT select FB_MACMODES if PPC help This driver supports graphics boards with the ATI Mach64 chips. @@ -1452,6 +1444,7 @@ config FB_ATY_GX config FB_ATY_BACKLIGHT bool "Support for backlight control" depends on FB_ATY + depends on BACKLIGHT_CLASS_DEVICE default y help Say Y here if you want to control the backlight of your display. @@ -1997,12 +1990,12 @@ config FB_SH_MOBILE_LCDC tristate "SuperH Mobile LCDC framebuffer support" depends on FB && (SUPERH || ARCH_SHMOBILE) && HAVE_CLK depends on FB_SH_MOBILE_MERAM || !FB_SH_MOBILE_MERAM + depends on BACKLIGHT_CLASS_DEVICE select FB_SYS_FILLRECT select FB_SYS_COPYAREA select FB_SYS_IMAGEBLIT select FB_SYS_FOPS select FB_DEFERRED_IO - select FB_BACKLIGHT select SH_MIPI_DSI if SH_LCD_MIPI_DSI ---help--- Frame buffer driver for the on-chip SH-Mobile LCD controller. @@ -2356,10 +2349,10 @@ config FB_MSM config FB_MX3 tristate "MX3 Framebuffer support" depends on FB && MX3_IPU + depends on BACKLIGHT_CLASS_DEVICE select FB_CFB_FILLRECT select FB_CFB_COPYAREA select FB_CFB_IMAGEBLIT - select BACKLIGHT_CLASS_DEVICE default y help This is a framebuffer device for the i.MX31 LCD Controller. So diff --git a/drivers/video/fbdev/core/fbsysfs.c b/drivers/video/fbdev/core/fbsysfs.c index 53444ac19fe0..8f766f14038e 100644 --- a/drivers/video/fbdev/core/fbsysfs.c +++ b/drivers/video/fbdev/core/fbsysfs.c @@ -59,7 +59,7 @@ struct fb_info *framebuffer_alloc(size_t size, struct device *dev) info->device = dev; -#ifdef CONFIG_FB_BACKLIGHT +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) mutex_init(&info->bl_curve_mutex); #endif @@ -428,7 +428,7 @@ static ssize_t show_fbstate(struct device *device, return snprintf(buf, PAGE_SIZE, "%d\n", fb_info->state); } -#ifdef CONFIG_FB_BACKLIGHT +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) static ssize_t store_bl_curve(struct device *device, struct device_attribute *attr, const char *buf, size_t count) @@ -517,7 +517,7 @@ static struct device_attribute device_attrs[] = { __ATTR(stride, S_IRUGO, show_stride, NULL), __ATTR(rotate, S_IRUGO|S_IWUSR, show_rotate, store_rotate), __ATTR(state, S_IRUGO|S_IWUSR, show_fbstate, store_fbstate), -#ifdef CONFIG_FB_BACKLIGHT +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) __ATTR(bl_curve, S_IRUGO|S_IWUSR, show_bl_curve, store_bl_curve), #endif }; @@ -558,7 +558,7 @@ void fb_cleanup_device(struct fb_info *fb_info) } } -#ifdef CONFIG_FB_BACKLIGHT +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) /* This function generates a linear backlight curve * * 0: off diff --git a/include/linux/fb.h b/include/linux/fb.h index 09bb7a18d287..47e7742fdc9e 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -461,7 +461,7 @@ struct fb_info { struct list_head modelist; /* mode list */ struct fb_videomode *mode; /* current mode */ -#ifdef CONFIG_FB_BACKLIGHT +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) /* assigned backlight device */ /* set before framebuffer registration, remove after unregister */ diff --git a/include/uapi/linux/fb.h b/include/uapi/linux/fb.h index fb795c3b3c17..a7a4be063432 100644 --- a/include/uapi/linux/fb.h +++ b/include/uapi/linux/fb.h @@ -392,7 +392,7 @@ struct fb_cursor { struct fb_image image; /* Cursor image */ }; -#ifdef CONFIG_FB_BACKLIGHT +#if IS_ENABLED(CONFIG_BACKLIGHT_CLASS_DEVICE) /* Settings for the generic backlight code */ #define FB_BACKLIGHT_LEVELS 128 #define FB_BACKLIGHT_MAX 0xFF -- 2.1.1
