On Tue, Jun 23, 2015 at 08:25:05AM +0000, Dilger, Andreas wrote: > I've found in the past that developers can introduce bugs when they treat > return values as boolean when they really aren't. I can imagine a bug like that where a function can return 0-2 and people do: if (ret) instead of: if (ret == 1) but that bug is something else besides pointers so it doesn't apply here. What someone should do is try to measure it scientifically where we flash some code on the screen and you have to press J for NULL and K for non-NULL and we time it to the hundredth of a second. I have a feeling that (NULL != foo) is the worst way to write it because of the double negative Yoda code. Yoda code is the most useless thing ever. I have actually measured this and we introduce about 2 = vs == bugs per year. It's probably less now that we have so many static checks against it. But people decided that Yoda code was a good idea based on their gut instead of using statistics and measurements and science. regards, dan carpenter _______________________________________________ devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxx http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel