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

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Message-ID: <53D6FE95.6040605@oracle.com>
Date:	Tue, 29 Jul 2014 09:53:25 +0800
From:	ethan zhao <ethan.zhao@...cle.com>
To:	Alex Williamson <alex.williamson@...hat.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 2014/7/29 5:00, Alex Williamson wrote:
> 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.
   Though it is a flag operation now, may not later, we define it 
because we want to hide the internal operation.
   'set' to 'deassigned'  status is enough. So I would like keep it.
>
>> +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,
   Yep,

   return pdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED

   is enough.

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

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