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Message-ID: <6c8ca3a6-5898-ccba-cd01-9622215ddd10@loongson.cn>
Date: Mon, 24 Jul 2023 21:02:14 +0800
From: suijingfeng <suijingfeng@...ngson.cn>
To: Sui Jingfeng <sui.jingfeng@...ux.dev>,
Bjorn Helgaas <bhelgaas@...gle.com>,
Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
Maxime Ripard <mripard@...nel.org>,
Thomas Zimmermann <tzimmermann@...e.de>,
David Airlie <airlied@...il.com>,
Daniel Vetter <daniel@...ll.ch>
Cc: linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
dri-devel@...ts.freedesktop.org, loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH 4/6] PCI/VGA: Move the new_state assignment out the loop
PING, please !
On 2023/7/11 21:43, Sui Jingfeng wrote:
> From: Sui Jingfeng <suijingfeng@...ngson.cn>
>
> In the vga_arbiter_notify_clients() function, the value of the 'new_state'
> variable will be 'false' on systems that have more than one PCI VGA card.
> Its value will be 'true' on systems that have one or no PCI VGA compatible
> card. In other words, its value is not relevant to the iteration, so move
> the assignment () out of the loop.
>
> For a system with multiple video cards, this patch saves the redundant
> assignment.
>
> Signed-off-by: Sui Jingfeng <suijingfeng@...ngson.cn>
> ---
> drivers/pci/vgaarb.c | 16 +++++++---------
> 1 file changed, 7 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/pci/vgaarb.c b/drivers/pci/vgaarb.c
> index 668139f7c247..4c448c758bab 100644
> --- a/drivers/pci/vgaarb.c
> +++ b/drivers/pci/vgaarb.c
> @@ -1468,22 +1468,20 @@ static void vga_arbiter_notify_clients(void)
> {
> struct vga_device *vgadev;
> unsigned long flags;
> - uint32_t new_decodes;
> - bool new_state;
> + bool state;
>
> if (!vga_arbiter_used)
> return;
>
> + state = (vga_count > 1) ? false : true;
> +
> spin_lock_irqsave(&vga_lock, flags);
> list_for_each_entry(vgadev, &vga_list, list) {
> - if (vga_count > 1)
> - new_state = false;
> - else
> - new_state = true;
> if (vgadev->set_decode) {
> - new_decodes = vgadev->set_decode(vgadev->pdev,
> - new_state);
> - vga_update_device_decodes(vgadev, new_decodes);
> + unsigned int decodes;
> +
> + decodes = vgadev->set_decode(vgadev->pdev, state);
> + vga_update_device_decodes(vgadev, decodes);
> }
> }
> spin_unlock_irqrestore(&vga_lock, flags);
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