Messages in this thread | | | Date | Fri, 18 Dec 2015 16:49:21 -0800 | From | Davidlohr Bueso <> | Subject | Re: [PATCH] futex: Allow FUTEX_CLOCK_REALTIME with FUTEX_WAIT op |
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On Fri, 18 Dec 2015, Darren Hart wrote:
>While reviewing Michael Kerrisk's recent futex manpage update, I noticed >that we allow the FUTEX_CLOCK_REALTIME flag for FUTEX_WAIT_BITSET but >not for FUTEX_WAIT. > >FUTEX_WAIT is treated as a simple version for FUTEX_WAIT_BITSET >internally (with a bitmask of FUTEX_BITSET_MATCH_ANY). As such, I cannot >come up with a reason for this exclusion for FUTEX_WAIT. > >This change does modify the behavior of the futex syscall, changing a >call with FUTEX_WAIT | FUTEX_CLOCK_REALTIME from returning -ENOSYS, to be >equivalent to FUTEX_WAIT_BITSET | FUTEX_CLOCK_REALTIME with a bitset of >FUTEX_BITSET_MATCH_ANY. > >Cc: Thomas Gleixner <tglx@linutronix.de> >Cc: Peter Zijlstra <peterz@infradead.org> >Cc: Davidlohr Bueso <dave@stgolabs.net> >Reported-by: Michael Kerrisk <mtk.manpages@gmail.com> >Signed-off-by: Darren Hart <dvhart@linux.intel.com>
Acked-by: Davidlohr Bueso <dave@stgolabs.net>
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