linux-kernel - Re: [PATCH v2 04/11] PCI/VGA: Drop the inline in the vga_update_device

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Message-ID: <28d94a7-ca19-6646-ce61-f0fec06e8bf2@linux.intel.com>
Date:   Wed, 9 Aug 2023 17:10:07 +0300 (EEST)
From:   Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
To:     Sui Jingfeng <sui.jingfeng@...ux.dev>
cc:     Bjorn Helgaas <bhelgaas@...gle.com>,
        Dave Airlie <airlied@...hat.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-pci@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Sui Jingfeng <suijingfeng@...ngson.cn>
Subject: Re: [PATCH v2 04/11] PCI/VGA: Drop the inline in the
 vga_update_device_decodes() function.

On Wed, 9 Aug 2023, Sui Jingfeng wrote:

> From: Sui Jingfeng <suijingfeng@...ngson.cn>
> 
> The vga_update_device_decodes() function is not performance-critical.
> So drop the inline. This patch also makes the parameter consistent with
> the argument, using the 'unsigned int' type instead of the 'signed' type
> to store the decode.

Use imperative form, Don't start with "This patch" but directly what 
follows after those words.
 
> Change the second argument of the vga_update_device_decodes() function
> to 'unsigned int' type.

Somehow it feels all these 3 changes should be in separate patches, I 
don't see how they're related at all with each other other than they touch 
roughly the same area.

-- 
 i.

> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
>  drivers/pci/vgaarb.c | 24 ++++++++++++------------
>  1 file changed, 12 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
> index 8742a51d450f..dc10a262fb5e 100644
> --- a/drivers/pci/vgaarb.c
> +++ b/drivers/pci/vgaarb.c
> @@ -860,24 +860,24 @@ static bool vga_arbiter_del_pci_device(struct pci_dev *pdev)
>  	return ret;
>  }
>  
> -/* this is called with the lock */
> -static inline void vga_update_device_decodes(struct vga_device *vgadev,
> -					     int new_decodes)
> +/* This is called with the lock */
> +static void vga_update_device_decodes(struct vga_device *vgadev,
> +				      unsigned int new_decodes)
>  {
>  	struct device *dev = &vgadev->pdev->dev;
> -	int old_decodes, decodes_removed, decodes_unlocked;
> +	unsigned int old_decodes = vgadev->decodes;
> +	unsigned int decodes_removed = ~new_decodes & old_decodes;
> +	unsigned int decodes_unlocked = vgadev->locks & decodes_removed;
>  
> -	old_decodes = vgadev->decodes;
> -	decodes_removed = ~new_decodes & old_decodes;
> -	decodes_unlocked = vgadev->locks & decodes_removed;
>  	vgadev->decodes = new_decodes;
>  
> -	vgaarb_info(dev, "changed VGA decodes: olddecodes=%s,decodes=%s:owns=%s\n",
> -		vga_iostate_to_str(old_decodes),
> -		vga_iostate_to_str(vgadev->decodes),
> -		vga_iostate_to_str(vgadev->owns));
> +	vgaarb_info(dev,
> +		    "VGA decodes changed: olddecodes=%s,decodes=%s:owns=%s\n",
> +		    vga_iostate_to_str(old_decodes),
> +		    vga_iostate_to_str(vgadev->decodes),
> +		    vga_iostate_to_str(vgadev->owns));
>  
> -	/* if we removed locked decodes, lock count goes to zero, and release */
> +	/* If we removed locked decodes, lock count goes to zero, and release */
>  	if (decodes_unlocked) {
>  		if (decodes_unlocked & VGA_RSRC_LEGACY_IO)
>  			vgadev->io_lock_cnt = 0;
>