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From: Frederic Weisbecker on 30 Mar 2010 19:00
On Tue, Mar 30, 2010 at 10:56:20PM +0200, Arnd Bergmann wrote:
> +config TTY_MUTEX
> + bool "Use a mutex instead of BKL for TTY locking"
> + depends on EXPERIMENTAL && SMP


You still need it on UP-PREEMPT.

The bkl disables preemption so you need to "reproduce"
this atomicity by locking your path.

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