linux-kernel - Re: [PATCH 1/4] PCI: introduce helper functions for device flag operation

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Date:	Mon, 28 Jul 2014 15:00:06 -0600
From:	Alex Williamson <alex.williamson@...hat.com>
To:	Ethan Zhao <ethan.zhao@...cle.com>
Cc:	bhelgaas@...gle.com, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, gleb@...nel.org, pbonzini@...hat.com,
	kvm@...r.kernel.org, konrad.wilk@...cle.com,
	boris.ostrovsky@...cle.com, david.vrabel@...rix.com,
	xen-devel@...ts.xenproject.org, alexander.h.duyck@...el.com,
	ethan.kernel@...il.com
Subject: Re: [PATCH 1/4] PCI: introduce helper functions for device flag
 operation

On Wed, 2014-07-23 at 00:19 +0800, Ethan Zhao wrote:
> This patch introduced three helper functions to hide direct
> device flag operation.
> 
> void pci_set_dev_assigned(struct pci_dev *pdev);
> void pci_set_dev_deassigned(struct pci_dev *pdev);
> bool pci_is_dev_assigned(struct pci_dev *pdev);
> 
> Signed-off-by: Ethan Zhao <ethan.zhao@...cle.com>
> ---
>  include/linux/pci.h |   13 +++++++++++++
>  1 files changed, 13 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/pci.h b/include/linux/pci.h
> index aab57b4..5f6f8fa 100644
> --- a/include/linux/pci.h
> +++ b/include/linux/pci.h
> @@ -1129,6 +1129,19 @@ resource_size_t pcibios_window_alignment(struct pci_bus *bus,
>  
>  int pci_set_vga_state(struct pci_dev *pdev, bool decode,
>  		      unsigned int command_bits, u32 flags);
> +/* helper functions for operation of device flag */
> +static inline void pci_set_dev_assigned(struct pci_dev *pdev)
> +{
> +	pdev->dev_flags |= PCI_DEV_FLAGS_ASSIGNED;
> +}
> +static inline void pci_set_dev_deassigned(struct pci_dev *pdev)
> +{
> +	pdev->dev_flags &= ~PCI_DEV_FLAGS_ASSIGNED;
> +}

I think pci_clear_dev_assigned() would make more sense, we're not
setting a flag named DEASSIGNED.

> +static inline bool pci_is_dev_assigned(struct pci_dev *pdev)
> +{
> +	return pdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED ? true : false;
> +}

The ternary operation isn't necessary.  Thanks,

Alex

>  /* kmem_cache style wrapper around pci_alloc_consistent() */
>  
>  #include <linux/pci-dma.h>



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