linux-kernel - Re: [PATCH] fbdev: sti: don't select CONFIG

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Message-id: <3242330.XRvUNh2arJ@amdc3058>
Date:   Fri, 05 May 2017 17:27:06 +0200
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     linux-parisc@...r.kernel.org, Helge Deller <deller@....de>,
        jejb@...isc-linux.org, Alexander Beregalov <a.beregalov@...il.com>,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] fbdev: sti: don't select CONFIG_VT

On Friday, April 28, 2017 09:51:25 PM Arnd Bergmann wrote:
> While working on another build error, I ran into several variations of
> this dependency loop:
> 
> subsection "Kconfig recursive dependency limitations"
> drivers/input/Kconfig:8:	symbol INPUT is selected by VT
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/tty/Kconfig:12:	symbol VT is selected by FB_STI
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/video/fbdev/Kconfig:677:	symbol FB_STI depends on FB
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/video/fbdev/Kconfig:5:	symbol FB is selected by DRM_KMS_FB_HELPER
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/gpu/drm/Kconfig:72:	symbol DRM_KMS_FB_HELPER is selected by DRM_KMS_CMA_HELPER
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/gpu/drm/Kconfig:137:	symbol DRM_KMS_CMA_HELPER is selected by DRM_HDLCD
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/gpu/drm/arm/Kconfig:6:	symbol DRM_HDLCD depends on OF
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/of/Kconfig:4:	symbol OF is selected by X86_INTEL_CE
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> arch/x86/Kconfig:523:	symbol X86_INTEL_CE depends on X86_IO_APIC
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> arch/x86/Kconfig:1011:	symbol X86_IO_APIC depends on X86_LOCAL_APIC
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> arch/x86/Kconfig:1005:	symbol X86_LOCAL_APIC depends on X86_UP_APIC
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> arch/x86/Kconfig:980:	symbol X86_UP_APIC depends on PCI_MSI
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/pci/Kconfig:11:	symbol PCI_MSI is selected by AMD_IOMMU
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/iommu/Kconfig:106:	symbol AMD_IOMMU depends on IOMMU_SUPPORT
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/iommu/Kconfig:5:	symbol IOMMU_SUPPORT is selected by DRM_ETNAVIV
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/gpu/drm/etnaviv/Kconfig:2:	symbol DRM_ETNAVIV depends on THERMAL
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/thermal/Kconfig:5:	symbol THERMAL is selected by ACPI_VIDEO
> For a resolution refer to Documentation/kbuild/kconfig-language.txt
> subsection "Kconfig recursive dependency limitations"
> drivers/acpi/Kconfig:183:	symbol ACPI_VIDEO is selected by INPUT
> 
> This doesn't currently show up as I fixed the 'THERMAL' part of it,
> but I noticed that the FB_STI dependency should not be there but
> was introduced by slightly incorrect bug-fix patch that tried to
> fix a link error.
> 
> Instead of selecting 'VT' to make us enter the drivers/video/console
> directory at compile-time, it's sufficient to build the
> drivers/video/console/sticore.c file by adding its directory
> to when CONFIG_FB_STI is enabled. Alternatively, we could move the
> sticore code to another directory that is always built when we
> have at STI_CONSOLE or FB_STI enabled.
> 
> Fixes: 17085a934592 ("parisc: stifb: should depend on STI_CONSOLE")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Patch queued for 4.12, thanks.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics