> >On Tue, Nov 10, 2020 at 11:21:22AM +0000, Peter Chen wrote: >> On 20-11-10 09:20:54, Pawel Laszczak wrote: >> > Hi, >> > >> > >> >> > >> int cdns3_hw_role_switch(struct cdns3 *cdns); >> > >> -int cdns3_init(struct cdns3 *cdns); >> > >> -int cdns3_remove(struct cdns3 *cdns); >> > >> +extern int cdns3_init(struct cdns3 *cdns); >> > >> +extern int cdns3_remove(struct cdns3 *cdns); >> > > >> > >Why add "extern" here and below? >> > > >> > >> > These functions are the API between cdnsp and cdns3 modules. >> > It's looks like a common approach in kernel. >> > Many or even most of API function in kernel has "extern". >> > >> >> Even you have not written "extern" keyword, the "extern" is >> added implicitly by compiler. Usually, we use "extern" for variable >> or the function is defined at assembly. You could see some >> "extern" keyword use cases at include/linux/device.h. > >We are moving away from using this keyword for functions now, if at all >possible please. Only use it for variables, I think checkpatch now >catches it as well. >
Ok, I will remove all extern from driver. Removing it also will remove checkpatch.pl warmings. Thanks Pawel
