linux-kernel - Re: [PATCH 2/3] PCI: Export find_pci_root

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Message-ID: <874kafwslu.wl-maz@kernel.org>
Date:   Mon, 20 Sep 2021 09:37:01 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Kishon Vijay Abraham I <kishon@...com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        <linux-kernel@...r.kernel.org>, <linux-pci@...r.kernel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        <lokeshvutla@...com>
Subject: Re: [PATCH 2/3] PCI: Export find_pci_root_bus()

On Mon, 20 Sep 2021 07:41:32 +0100,
Kishon Vijay Abraham I <kishon@...com> wrote:
> 
> Export find_pci_root_bus() in order for other subsystems (like
> IRQCHIP) to find the root bus of a particual PCIe device.
> 
> This is done in preparation for GIC ITS to walk the PCIe bus for
> calculating the total number of interrupt vectors that has to be
> supported by a specific GIC ITS device ID, specifically when
> "msi-map-mask" is populated in device tree.
> 
> Signed-off-by: Kishon Vijay Abraham I <kishon@...com>
> ---
>  drivers/pci/host-bridge.c | 3 ++-
>  include/linux/pci.h       | 1 +
>  2 files changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/pci/host-bridge.c b/drivers/pci/host-bridge.c
> index afa50b446567..4ec34d040c02 100644
> --- a/drivers/pci/host-bridge.c
> +++ b/drivers/pci/host-bridge.c
> @@ -9,13 +9,14 @@
>  
>  #include "pci.h"
>  
> -static struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
> +struct pci_bus *find_pci_root_bus(struct pci_bus *bus)
>  {
>  	while (bus->parent)
>  		bus = bus->parent;
>  
>  	return bus;
>  }
> +EXPORT_SYMBOL_GPL(find_pci_root_bus);

There is no need for this export as the ITS cannot be made modular.

	M.

-- 
Without deviation from the norm, progress is not possible.