linux-kernel - Re: [PATCH v3 1/8] x86/PCI: Improve code readability

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Message-ID: <971d8fda-5317-7481-d435-35bf1faae115@linux.intel.com>
Date: Thu, 8 Aug 2024 11:55:02 +0300 (EEST)
From: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To: Stewart Hildebrand <stewart.hildebrand@....com>
cc: Bjorn Helgaas <bhelgaas@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, 
    Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>, 
    Dave Hansen <dave.hansen@...ux.intel.com>, 
    "H. Peter Anvin" <hpa@...or.com>, Philipp Stanner <pstanner@...hat.com>, 
    x86@...nel.org, linux-pci@...r.kernel.org, 
    LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 1/8] x86/PCI: Improve code readability

On Wed, 7 Aug 2024, Stewart Hildebrand wrote:

> The indentation in pcibios_allocate_dev_resources() is unusually deep.
> Improve that by moving some of its code to a new function,
> alloc_resource().
> 
> Take the opportunity to remove redundant information from dev_dbg().
> 
> Signed-off-by: Stewart Hildebrand <stewart.hildebrand@....com>
> ---
> v2->v3:
> * new subject (was: "x86/PCI: Move some logic to new function")
> * reword commit message (thanks Philipp)
> 
> v1->v2:
> * new patch
> ---
>  arch/x86/pci/i386.c | 38 +++++++++++++++++++++-----------------
>  1 file changed, 21 insertions(+), 17 deletions(-)
> 
> diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
> index f2f4a5d50b27..3abd55902dbc 100644
> --- a/arch/x86/pci/i386.c
> +++ b/arch/x86/pci/i386.c
> @@ -246,6 +246,25 @@ struct pci_check_idx_range {
>  	int end;
>  };
>  
> +static void alloc_resource(struct pci_dev *dev, int idx, int pass)
> +{
> +	struct resource *r = &dev->resource[idx];
> +
> +	dev_dbg(&dev->dev, "BAR %d: reserving %pr (p=%d)\n", idx, r, pass);
> +
> +	if (pci_claim_resource(dev, idx) < 0) {
> +		if (r->flags & IORESOURCE_PCI_FIXED) {
> +			dev_info(&dev->dev, "BAR %d %pR is immovable\n",
> +				 idx, r);
> +		} else {
> +			/* We'll assign a new address later */
> +			pcibios_save_fw_addr(dev, idx, r->start);
> +			r->end -= r->start;
> +			r->start = 0;
> +		}
> +	}
> +}
> +
>  static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
>  {
>  	int idx, disabled, i;
> @@ -271,23 +290,8 @@ static void pcibios_allocate_dev_resources(struct pci_dev *dev, int pass)
>  				disabled = !(command & PCI_COMMAND_IO);
>  			else
>  				disabled = !(command & PCI_COMMAND_MEMORY);
> -			if (pass == disabled) {
> -				dev_dbg(&dev->dev,
> -					"BAR %d: reserving %pr (d=%d, p=%d)\n",
> -					idx, r, disabled, pass);
> -				if (pci_claim_resource(dev, idx) < 0) {
> -					if (r->flags & IORESOURCE_PCI_FIXED) {
> -						dev_info(&dev->dev, "BAR %d %pR is immovable\n",
> -							 idx, r);
> -					} else {
> -						/* We'll assign a new address later */
> -						pcibios_save_fw_addr(dev,
> -								idx, r->start);
> -						r->end -= r->start;
> -						r->start = 0;
> -					}
> -				}
> -			}
> +			if (pass == disabled)
> +				alloc_resource(dev, idx, pass);
>  		}
>  	if (!pass) {
>  		r = &dev->resource[PCI_ROM_RESOURCE];
> 

Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>

-- 
 i.