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Subject[PATCH] pci: Add include guard to include/linux/pci_ids.h
Date
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>
---
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


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