Where is the location of the linux source codes?
I am used to browsing /usr/src/ folders in the past but in recent distro that I have installed, the source codes are no longer in that folder, all I can see are makefiles ang Kconfig. The module folders are still there like drivers, kernel, fs, etc, but they do not contain anything other than makefiles. So where are the source codes located now? And why are the source files relocated somewhere else?