On Mon, 16 Aug 2021, Jani Nikula jani.nikula@linux.intel.com wrote:
On Mon, 16 Aug 2021, Jackie Liu liu.yun@linux.dev wrote:
Hi Jani.
Your suggestion is that?
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 7ff89690a976..ba179a539497 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -77,6 +77,7 @@ config DRM_DEBUG_SELFTEST config DRM_KMS_HELPER tristate depends on DRM
depends on FB if DRM_FBDEV_EMULATION help CRTC helpers for KMS drivers.But it has a syntax error.
Ah, try this then:
depends on FB || FB=n
Or this monster:
depends on FB || DRM_FBDEV_EMULATION=n
-- Thanks, BR, Jackie Liu
在 2021/8/16 下午4:33, Jani Nikula 写道:
On Mon, 16 Aug 2021, Jackie Liu liu.yun@linux.dev wrote:
Hi Jani.
My CI report an randconfigs build failed. there are:
drm_fb_helper.c:(.text+0x302): undefined reference to `fb_set_suspend' drm_fb_helper.c:(.text+0xaea): undefined reference to `register_framebuffer' drm_fb_helper.c:(.text+0x1dcc): undefined reference to `framebuffer_alloc' ld: drm_fb_helper.c:(.text+0x1dea): undefined reference to `fb_alloc_cmap' ld: drm_fb_helper.c:(.text+0x1e2f): undefined reference to `fb_dealloc_cmap' ld: drm_fb_helper.c:(.text+0x1e5b): undefined reference to `framebuffer_release' drm_fb_helper.c:(.text+0x1e85): undefined reference to `unregister_framebuffer' drm_fb_helper.c:(.text+0x1ee9): undefined reference to `fb_dealloc_cmap' ld: drm_fb_helper.c:(.text+0x1ef0): undefined reference to `framebuffer_release' drm_fb_helper.c:(.text+0x1f96): undefined reference to `fb_deferred_io_cleanup' drm_fb_helper.c:(.text+0x203b): undefined reference to `fb_sys_read' drm_fb_helper.c:(.text+0x2051): undefined reference to `fb_sys_write' drm_fb_helper.c:(.text+0x208d): undefined reference to `sys_fillrect' drm_fb_helper.c:(.text+0x20bb): undefined reference to `sys_copyarea' drm_fb_helper.c:(.text+0x20e9): undefined reference to `sys_imageblit' drm_fb_helper.c:(.text+0x2117): undefined reference to `cfb_fillrect' drm_fb_helper.c:(.text+0x2172): undefined reference to `cfb_copyarea' drm_fb_helper.c:(.text+0x21cd): undefined reference to `cfb_imageblit' drm_fb_helper.c:(.text+0x2233): undefined reference to `fb_set_suspend' drm_fb_helper.c:(.text+0x22b0): undefined reference to `fb_set_suspend' drm_fb_helper.c:(.text+0x250f): undefined reference to `fb_deferred_io_init'
The main reason is because DRM_FBDEV_EMULATION is built-in, and CONFIG_FB is compiled as a module.
DRM_FBDEV_EMULATION is not a module, it's just a config knob. drm_fb_helper.ko is the module, enabled via DRM_KMS_HELPER, and it has an implicit dependency on FB, and DRM_FBDEV_EMULATION selects DRM_KMS_HELPER. Select just breaks dependencies in all kinds of ways.
This might help in config DRM_KMS_HELPER, and it might help the reader because it's factual:
depends on FB if DRM_FBDEV_EMULATION
BR, Jani.
-- Jackie Liu
在 2021/8/16 下午3:01, Jani Nikula 写道:
On Mon, 16 Aug 2021, Jackie Liu liu.yun@linux.dev wrote:
From: Jackie Liu liuyun01@kylinos.cn
When CONFIG_DRM_FBDEV_EMULATION is compiled to y and CONFIG_FB is m, the compilation will fail. we need make that dependency explicit.
What's the failure mode? Using select here is a bad idea.
BR, Jani.
Reported-by: k2ci kernel-bot@kylinos.cn Signed-off-by: Jackie Liu liuyun01@kylinos.cn
drivers/gpu/drm/Kconfig | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/Kconfig b/drivers/gpu/drm/Kconfig index 7ff89690a976..346a518b5119 100644 --- a/drivers/gpu/drm/Kconfig +++ b/drivers/gpu/drm/Kconfig @@ -98,7 +98,7 @@ config DRM_DEBUG_DP_MST_TOPOLOGY_REFS config DRM_FBDEV_EMULATION bool "Enable legacy fbdev support for your modesetting driver" depends on DRM
- depends on FB
- select FB select DRM_KMS_HELPER select FB_CFB_FILLRECT select FB_CFB_COPYAREA