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@gmail.com> 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.
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