New: powerpc: MPC10X_BRIDGE violates Kconfig dependency of PPC_INDIRECT_PCI on PCI

https://bugzilla.kernel.org/show_bug.cgi?id=209297

Bug ID: 209297
Summary: powerpc: MPC10X_BRIDGE violates Kconfig dependency of
PPC_INDIRECT_PCI on PCI
Product: Platform Specific/Hardware
Version: 2.5
Kernel Version: 5.9-rc4
Hardware: PPC-32
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: PPC-32
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected], [email protected]
Regression: No

The commit 25635c71e441 ("ppc: Use the indirect_pci.c from arch/powerpc/sysdev")
introduced PPC_INDIRECT_PCI as a non-visible config that depends on PCI.

Since it is non-visible, the dependency on PCI has no implications other than leading to Kbuild build warnings if !PCI. For example, disabling PCI and enabling LINKSTATION leads to the following Kbuild warning since PPC_INDIRECT_PCI is selected by MPC10X_BRIDGE, which is selected by LINKSTATION:

WARNING: unmet direct dependencies detected for PPC_INDIRECT_PCI
Depends on [n]: PCI [=n]
Selected by [y]:
- MPC10X_BRIDGE [=y]

There are many other configs that select PPC_INDIRECT_PCI but they seem to enable PCI one way or another, e.g., enabling FORCE_PCI or selecting PPC_INDIRECT_PCI if PCI. Among them, only MPC10X_BRIDGE and MV64X60 seem to not account for the dependency on PCI, and MV64X60 seem to be obsolete:
https://bugzilla.kernel.org/show_bug.cgi?id=209277

I am not sure about the internals of the user subsystem. However, two fix options I see are: 1) --select FORCE_PCI-- by MPC10X_BRIDGE, 2) select PPC_INDIRECT_PCI --if PCI-- by MPC10X_BRIDGE.

Thanks,
Necip

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