Bjorn Helgaas <bhelgaas@xxxxxxxxxx> writes: > 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@xxxxxxxxxxxxxxxxxx> > > Applied to pci/misc for v3.17, thanks! > Great. One thing I thought about, but which is likely undoable in practice: There are only about 800 files which use any of the #defines in pci_ids.h, but more than 3000 files include pci.h directly or indirectly. Making those 800 include pci_ids.h directly and removing it from pci.h could speed up compilation of the other 2200. Rasmus -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
