linux-kernel - [PATCH] pci: Add include guard to include/linux/pci

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Date:	Thu, 10 Jul 2014 14:05:11 +0200
From:	Rasmus Villemoes <linux@...musvillemoes.dk>
To:	Bjorn Helgaas <bhelgaas@...gle.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: [PATCH] pci: Add include guard to include/linux/pci_ids.h

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@...musvillemoes.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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