This is the first step of integrating the log crate as the main way to
log messages from the kernel.

Also, reexport all log macros. This module should eventually be the
only logging API used in the kernel.

Signed-off-by: Wren Turkal <wt@penguintechs.org>

Thanks to @4lDO2 for all this. I just moved his changes to io_uring onto
the master branch of the kernel. I take no credit.

Because the way we were using inline assembly was technically incorrect
and breaking the laws of rust

This *finally* compiles. That doesn't mean it works!

Fix memory leaks in exec
Remove warnings

Fix issues with SIGCONT