linux-kernel - Re: [patch V2 02/40] ACPI/IORT: Make prototype of iort_pmsi_get_dev

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Message-ID: <4a2836d6-3088-c513-7541-be7c8a0464a5@arm.com>
Date:   Mon, 21 Nov 2022 15:13:38 +0000
From:   Robin Murphy <robin.murphy@....com>
To:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>
Cc:     Will Deacon <will@...nel.org>, linux-pci@...r.kernel.org,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Marc Zyngier <maz@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jason Gunthorpe <jgg@...lanox.com>,
        Andrew Lunn <andrew@...n.ch>,
        Gregory Clement <gregory.clement@...tlin.com>,
        Sebastian Hesselbarth <sebastian.hesselbarth@...il.com>,
        Ammar Faizi <ammarfaizi2@...weeb.org>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Nishanth Menon <nm@...com>, Tero Kristo <kristo@...nel.org>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org,
        Vinod Koul <vkoul@...nel.org>, Sinan Kaya <okaya@...nel.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <andersson@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Shameerali Kolothum Thodi 
        <shameerali.kolothum.thodi@...wei.com>,
        Zenghui Yu <yuzenghui@...wei.com>,
        Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>
Subject: Re: [patch V2 02/40] ACPI/IORT: Make prototype of
 iort_pmsi_get_dev_id() always available

On 2022-11-21 14:39, Thomas Gleixner wrote:
> W=1 build complains:
> 
> drivers/irqchip/irq-gic-v3-its-msi-parent.c:110:12: warning: no previous prototype for function 'iort_pmsi_get_dev_id' [-Wmissing-prototypes]
>     int __weak iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
> 
> Reported-by: Ammar Faizi <ammarfaizi2@...weeb.org>
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> Cc: Robin Murphy <robin.murphy@....com>
> Cc: Lorenzo Pieralisi <lpieralisi@...nel.org>
> ---
>   include/linux/acpi_iort.h |    4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
> 
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -26,13 +26,15 @@ int iort_register_domain_token(int trans
>   			       struct fwnode_handle *fw_node);
>   void iort_deregister_domain_token(int trans_id);
>   struct fwnode_handle *iort_find_domain_token(int trans_id);
> +
> +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
> +
>   #ifdef CONFIG_ACPI_IORT
>   void acpi_iort_init(void);
>   u32 iort_msi_map_id(struct device *dev, u32 id);
>   struct irq_domain *iort_get_device_domain(struct device *dev, u32 id,
>   					  enum irq_domain_bus_token bus_token);
>   void acpi_configure_pmsi_domain(struct device *dev);
> -int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);

FWIW I'd prefer to add a "return -ENODEV" stub in the #else section to 
match the others.

<wonders why this was inconsistent to begin with, goes off to dig 
through Git history...>

Oh hey, then we could also finally make good on that 6-year-old promise 
that "The weak function will be removed when the ACPI counterpart is 
merged." :)

Thanks,
Robin.

>   void iort_get_rmr_sids(struct fwnode_handle *iommu_fwnode,
>   		       struct list_head *head);
>   void iort_put_rmr_sids(struct fwnode_handle *iommu_fwnode,
>