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    SubjectRe: [RFC 9/9] tty: implement BTM as mutex instead of BKL
    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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