linux-kernel - Re: [PATCH] arm64: dts: marvell: armada-37xx: Set linux,pci-domain to zero

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Date:   Sat, 17 Apr 2021 21:42:41 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Andrew Lunn <andrew@...n.ch>
Cc:     Rob Herring <robh+dt@...nel.org>, Marek Behun <marek.behun@....cz>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        devicetree@...r.kernel.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        PCI <linux-pci@...r.kernel.org>
Subject: Re: [PATCH] arm64: dts: marvell: armada-37xx: Set linux,pci-domain
 to zero

On Saturday 17 April 2021 17:19:38 Andrew Lunn wrote:
> > Currently this code is implemented in pci_bus_find_domain_nr() function.
> > IIRC domain number is 16bit integer, so plain bitmap would consume 8 kB
> > of memory. I'm not sure if it is fine or some other tree-based structure
> > for allocated domain numbers is needed.
> 
> Hi Pali
> 
> Have a look at lib/idr.c
> 
>      Andrew

Great! So number allocation is already implemented in kernel (via radix trees).