linux-kernel - Re: [PATCH v2 3/4] PCI: Change extend_bridge

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Message-ID: <20200116102118.GX2838@lahna.fi.intel.com>
Date:   Thu, 16 Jan 2020 12:21:18 +0200
From:   Mika Westerberg <mika.westerberg@...ux.intel.com>
To:     Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Logan Gunthorpe <logang@...tatee.com>
Subject: Re: [PATCH v2 3/4] PCI: Change extend_bridge_window() to set
 resource size directly

On Wed, Jan 15, 2020 at 05:57:47PM +0000, Nicholas Johnson wrote:
> Change extend_bridge_window() to set resource size directly instead of
> using additional resource lists.
> 
> This is required in preparation for the next patch [0] which will allow
> the resource to shrink. If we do not make this change, the next patch
> will need to have complicated logic to handle shrinking the overall size
> using size and add_size.
> 
> Remove the resource from add_list, as a zero-sized additional resource
> is redundant.
> 
> Update comment in pci_bus_distribute_available_resources() to reflect
> the above changes.
> 
> [0]
> PCI: Allow extend_bridge_window() to shrink resource if necessary
> 
> Signed-off-by: Nicholas Johnson <nicholas.johnson-opensource@...look.com.au>

Reviewed-by: Mika Westerberg <mika.westerberg@...ux.intel.com>