reduce 'unknown op 265' message storm

[Juergen Lock]

In article <20101014184626.GA1961 at freebsd.org> you write:
>
>--ZPt4rx8FFjLCG7dd
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>hi there,
Hi! :)
>
>i see a lot of these warnings:
>
>'linux_sys_futex: unknown op 265'
>
>although there is no support in the linuxulator for opcode 256
>(FUTEX_CLOCK_REALTIME) it is possible to handle some of these cases earlier.
>
>FUTEX_CLOCK_REALTIME can be used to tell linux to use CLOCK_REALTIME instead of
>CLOCK_MONOTONIC. FUTEX_CLOCK_REALTIME however must only be set, if either
>FUTEX_WAIT_BITSET or FUTEX_WAIT_REQUEUE_PI are set too. if that's not the case
>we can die with -ENOSYS right at the beginning.

 Hmm looks like that's not enough to fix kern/148076, i.e. emerge...

	http://www.freebsd.org/cgi/query-pr.cgi?pr=kern/148076

 This is procstat -k of the hanging emerge process:

  PID    TID COMM             TDNAME           KSTACK
41734 100450 python2.6        -                mi_switch sleepq_catch_signals sleepq_wait_sig _cv_wait_sig tty_wait tty_drain ttydev_leave ttydev_close devfs_close vn_close vn_closefile devfs_close_f _fdrop closef kern_close ia32_syscall Xint0x80_syscall

 (Disclaimer: I applied the patch on 8.1 and just reloaded linux.ko,
maybe head has other fixes that are also needed here.)

 Cheers,
	Juergen