On Thu, 04 Jul 2013 08:33:00 +0200, Martin Kepplinger said: > When I change something in the kernel and just hit make from toplevel > dir, it always compiles everything again, no matter if it wasn't changed > at all in the meantime. It *really* depends on which CONFIG_ variable you change. If you change some CONFIG_ variables like the ones that control whether a specific module is built, the rebuild may in fact only compile 1 or 2 .c files and link the module into a .ko and be done. Maybe a few more if you have /proc/config.gz enabled, because then it has to rebuild and relink the data for that into the kernel. THe gotcha is that changing other CONFIG_ variables can result in almost everything being rebuilt - for instance, if you change a CONFIG_ that controls a #ifdef in sched.h or one of the base networking headers, that will cause a recompile of everything that includes that .h (and pretty much everybody and their pet llama ends up including sched.h indirectly).
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