>>> On 12.09.12 at 19:41, Randy Dunlap <[email protected]> wrote: > On 09/12/2012 12:43 AM, Jan Beulich wrote: >>>>> On 11.09.12 at 19:38, Linus Walleij <[email protected]> wrote: >>> On Mon, Sep 10, 2012 at 2:16 PM, Jan Beulich <[email protected]> wrote: >>>> + return gpiolib_sysfs_init() ?: gpiolib_debugfs_init(); >>> >>> I can't parse this, sorry the gpio subsystem maintainer is too bad coder. >>> What about something more readable? >>> >>> int ret; >>> >>> ret = gpiolib_sysfs_init(); >>> if (ret) >>> return ret; >>> return gpiolib_debugfs_init(); >>> >>> I know it doesn't look as cool but it's easier for me to understand. >> >> Okay, since you're the second one to complain despite there >> being other uses of the construct in the same source file, I'll >> replace it, ... > > > Does C just use the value generated from the left side of a ?: > expression for the middle (empty) expression or does it call the > function again (which would usually be bad)?
It's the purpose of omitting the middle expression to avoid the second evaluation of that expression (and obviously the compiler can't generally do this on its own when seeing the same expression used twice). Jan -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
