[PATCH] Revert "drm/panthor: Fix undefined panthor_device_suspend/resume symbol issue"

[Liviu Dudau]

On Mon, Mar 11, 2024 at 02:26:50PM +0200, Jani Nikula wrote:
> On Mon, 11 Mar 2024, Boris Brezillon <boris.brezillon at collabora.com> wrote:
> > On Mon, 11 Mar 2024 13:51:46 +0200
> > Jani Nikula <jani.nikula at intel.com> wrote:
> >
> >> On Mon, 11 Mar 2024, Boris Brezillon <boris.brezillon at collabora.com> wrote:
> >> > On Mon, 11 Mar 2024 13:16:19 +0200
> >> > Jani Nikula <jani.nikula at intel.com> wrote:
> >> >  
> >> >> This reverts commit 674dc7f61aefea81901c21402946074927e63f1a.
> >> >> 
> >> >> The commit causes a recursive dependency in kconfig:
> >> >> 
> >> >> drivers/iommu/Kconfig:14:error: recursive dependency detected!
> >> >> drivers/iommu/Kconfig:14:	symbol IOMMU_SUPPORT is selected by DRM_PANTHOR
> >> >> drivers/gpu/drm/panthor/Kconfig:3:	symbol DRM_PANTHOR depends on PM
> >> >> kernel/power/Kconfig:183:	symbol PM is selected by PM_SLEEP
> >> >> kernel/power/Kconfig:117:	symbol PM_SLEEP depends on HIBERNATE_CALLBACKS
> >> >> kernel/power/Kconfig:35:	symbol HIBERNATE_CALLBACKS is selected by XEN_SAVE_RESTORE
> >> >> arch/x86/xen/Kconfig:67:	symbol XEN_SAVE_RESTORE depends on XEN
> >> >> arch/x86/xen/Kconfig:6:	symbol XEN depends on PARAVIRT
> >> >> arch/x86/Kconfig:781:	symbol PARAVIRT is selected by HYPERV
> >> >> drivers/hv/Kconfig:5:	symbol HYPERV depends on X86_LOCAL_APIC
> >> >> arch/x86/Kconfig:1106:	symbol X86_LOCAL_APIC depends on X86_UP_APIC
> >> >> arch/x86/Kconfig:1081:	symbol X86_UP_APIC prompt is visible depending on PCI_MSI
> >> >> drivers/pci/Kconfig:39:	symbol PCI_MSI is selected by AMD_IOMMU
> >> >> drivers/iommu/amd/Kconfig:3:	symbol AMD_IOMMU depends on IOMMU_SUPPORT
> >> >> For a resolution refer to Documentation/kbuild/kconfig-language.rst
> >> >> subsection "Kconfig recursive dependency limitations"
> >> >> 
> >> >> Fixes: 674dc7f61aef ("drm/panthor: Fix undefined panthor_device_suspend/resume symbol issue")
> >> >> Cc: Boris Brezillon <boris.brezillon at collabora.com>
> >> >> Cc: Liviu Dudau <liviu.dudau at arm.com>
> >> >> Cc: Steven Price <steven.price at arm.com>
> >> >> Signed-off-by: Jani Nikula <jani.nikula at intel.com>  
> >> >
> >> > Acked-by: Boris Brezillon <boris.brezillon at collabora.com>  
> >> 
> >> Your suggestion select -> depends on IOMMU_SUPPORT seems to also work,
> >> at least for me. Want to send a patch for that instead of me merging the
> >> revert?
> >
> > I replied on the other thread :-). I think we're better off reverting
> > the faulty commit, so we can discuss how to fix the original issue
> > properly without blocking the build.
> 
> Thanks, pushed to drm-misc-next.

So with this revert we're OK with an undefined symbol if !CONFIG_PM, but we're not happy
with a recursive dependency that is only triggered for COMPILE_TEST? I would've thought
IOMMU_SUPPORT options is a better one.

Best regards,
Liviu

> 
> BR,
> Jani.
> 
> 
> -- 
> Jani Nikula, Intel

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