Stacks and Heaps in an RTOS
On bare metal there is one stack, the linker script decides where it starts, and the map file tells you how much room it has. Adopting a kernel deletes all three of those facts at once. There are now N+1 stacks; the linker knows about exactly one of them; and the other N are ordinary arrays — either carved out of a heap at runtime or declared as static — with nothing above or below them that the toolchain considers special.