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Stack frame size checks

klint can check if there're functions with large stack frames. Checks are performed by diassembling all functions and look for subq $imm, %rsp instruction.

This check is disabled by default. It can be enabled by adding #![warn(klint::stack_frame_too_large)] on crate root (or, equivalently, enable the lint with CLI flags).

The stack frame size limit can be configured by --cfg=CONFIG_FRAME_WARN="<limit>". If you're building the kernel, this is cfg option is automatically passed by KBUILD.

Limitations

Currently only x86-64 is supported. The lint is silently ignored on other architectures.