Re: [PATCH] pci: Add include guard to include/linux/pci_ids.h

[Bjorn Helgaas <bhelgaas@google.com>]

On Thu, Jul 10, 2014 at 02:05:11PM +0200, Rasmus Villemoes wrote:
> Adding an include guard frees the preprocessor from reparsing over
> 2600 #defines in the cases where pci_ids.h is somehow included more
> than once. This gives a tiny-but-measurable performance improvement
> when compiling such files.
> 
> Signed-off-by: Rasmus Villemoes <linux@rasmusvillemoes.dk>

Applied to pci/misc for v3.17, thanks!

> ---
>  include/linux/pci_ids.h | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/include/linux/pci_ids.h b/include/linux/pci_ids.h
> index 7fa3173..6ed0bb7 100644
> --- a/include/linux/pci_ids.h
> +++ b/include/linux/pci_ids.h
> @@ -6,6 +6,8 @@
>   *	Do not add new entries to this file unless the definitions
>   *	are shared between multiple drivers.
>   */
> +#ifndef _LINUX_PCI_IDS_H
> +#define _LINUX_PCI_IDS_H
>  
>  /* Device classes and subclasses */
>  
> @@ -2968,3 +2970,5 @@
>  #define PCI_DEVICE_ID_XEN_PLATFORM	0x0001
>  
>  #define PCI_VENDOR_ID_OCZ		0x1b85
> +
> +#endif /* _LINUX_PCI_IDS_H */
> -- 
> 1.9.2
>