On Thu, Feb 04, 2021 at 12:07:58PM +0800, Xiao Ni wrote: > > > +extern void md_submit_discard_bio(struct mddev *mddev, struct md_rdev *rdev, > > > + struct bio *bio, sector_t start, sector_t size); > > no need for the extern. > > > Hi Christoph > > It needs to export it here. If not, there is compile error. > > raid0.c:502:3: error: implicit declaration of function > ???md_submit_discard_bio??? [-Werror=implicit-function-declaration] > md_submit_discard_bio(mddev, rdev, bio, Yes, the prototype needs to be in the header. But the extern keyword is no needed for function declarations.
