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SubjectRe: [PATCH 1/19] MUTEX: Introduce simple mutex implementation
 > (5) Redirects the following to apply to the new mutexes rather than the
> traditional semaphores:
> down()
> down_trylock()
> down_interruptible()
> up()

This will BREAK a lot of out-of-tree stuff if merged.

So please figure out some way to hang a HUGE banner out there
so that the external codebases know they need updating.

The simplest way would be to NOT re-use the up()/down() symbols,
but rather to either keep them as-is (counting semaphores),
or delete them entirely (so that external code *knows* of the change).

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