> I am currently looking at the 2.2.15 kernel tty code and saw that
> "save_flags cli - restore_flags" pair are used instead of spinlocks to
> enforce critical sections. Would'nt this break on SMP systems? I hope I
> am not overlooking something here.
On any SMP box the cli() isnt a local but a global cli, and there is 'magic'
going on to give uniproc compatible behaviour - it is _much_ less efficient
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