futex: add FUTEX_HAS_TIMEOUT flag to restart.futex.flags

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Currently restart is only used if there is a timeout. The requeue_pi
functionality requires restarting to futex_lock_pi() on signal after
wakeup in futex_wait_requeue_pi() regardless of if there was a timeout
or not. Using 0 for the timeout value is confusing as that could
indicate an expired timer. The flag makes this explicit. While the
check is not technically needed in futex_wait_restart(), doing so
makes the code consistent with and will avoid confusion should the
need arise to restart wait without a timeout.

Signed-off-by: Darren Hart <dvhltc@us.ibm.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

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Darren Hart 2009-04-03 13:40:22 -07:00 • committed by Thomas Gleixner

parent 8dac456a68

commit a72188d8a6

1 changed files with 8 additions and 4 deletions

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kernel/futex.c

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