Re: [PATCH v11 8/9] PCI: Split PME state selection into a local static function

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On 8/10/2023 11:21 AM, Andy Shevchenko wrote:
On Wed, Aug 09, 2023 at 01:54:52PM -0500, Mario Limonciello wrote:
When a device is not power manageable by the platform, and not already
in a low power state pci_target_state() will find the deepest state
that PME is supported and use this to select the wakeup state.

Simplify this logic and split it out to a local function. No intended
functional changes.

...

+static inline pci_power_t pci_get_wake_pme_state(struct pci_dev *dev)
+{
+	pci_power_t state = PCI_D3hot;
+
+	while (state && !(dev->pme_support & (1 << state)))
+		state--;
+
+	return state;

Sparse won't be happy about this code (with CF=-D__CHECK_ENDIAN__).

Basically it's something like

	return (__force pci_power_t)fls(dev->pme_support & GENMASK(PCI_D3hot, 0));

(but double check and test the logic).

+}

...

Yeah, I see that is the existing code, perhaps amend it first?


Are you sure? I actually double checked the sparse output using this command before I sent it.

make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' drivers/pci/pci.o

I didn't see anything related to the line numbers for this function.



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