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Re: [Xen-devel] [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@xxxxxxxxxx>
  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 
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,

  return pdev->dev_flags & PCI_DEV_FLAGS_ASSIGNED

  is enough.



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

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