Re: [PATCH v5 13/14] PCI: Fix composite resource sizing

[sashiko-bot@kernel.org]

> The bridge window sizing algorithm aims to pack child resources back to
> back. With composite child resources whose sizes are not a power of two,
> back-to-back placement may not be possible. The non-aligning remainder
> placement is limited because it must be adjacent to the rest of the
> composite resource.
> 
> Add bridge window gap size calculation.
> 
> When there are only two resources and at least one of them is
> composite, the gap end address aligns to meet the smaller of the two
> alignment requirements. If there is only one composite resource, the
> smaller alignment may be that of the composite resource.
> 
> Other combinations fall back to filling each resource's align sized
> blocks fully. Sometimes, smaller size may be possible but due to how
> sizing and assignment are made in different phases, it is not always
> possible to predict where each resource is assigned. Thus, the sizing
> has to play it safe.
> 
> Fixes: 9036bd0efcb6 ("PCI: Align head space better")
> Reported-by: Bjorn Helgaas <bhelgaas@google.com>
> Reported-by: Nikolas Joshua Britton <nbritton@exabit.io>
> Link: https://lore.kernel.org/linux-pci/20260903063124.9316-1-nbritton@exabit.io/
> Reported-by: Maciej Grochowski <Maciej.Grochowski@sony.com>
> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

Sashiko has reviewed this patch and found no issues.

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