make needs to enter the linux source tree in order to read the top-level Makefile from that directory. SUBDIRS is a variable used by the kernel top-level Makefile to know which directory it should build external modules after performing some initial checks to ensure proper compilation. Greetings, Philipp On Sat, Oct 1, 2011 at 11:53 AM, Parmenides <mobile.parmenides@xxxxxxxxx> wrote: > Hi, > > When making a kernel module outside the kernel source tree, I can > use this command to make my kernel module: > > make -C /usr/src/linux > SUBDIRS=$PWD modules > > According to man, the -C option will chanage the current working > directory to the top level directory of kernel source tree. > Furthermore, the SUBDIRS varialbe contains the path of current working > directory where my module is living. So, why does 'make' need to enter > /usr/src/linux first? And, What's the role of 'SUBDIRS'? Thanks. > > _______________________________________________ > Kernelnewbies mailing list > Kernelnewbies@xxxxxxxxxxxxxxxxx > http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies > _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx http://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
