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SubjectRe: [tip:locking/core] futex: Enhance comments in futex_lock_pi() for blocking paths
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On Mon, 2015-07-20 at 14:24 -0700, Darren Hart wrote:
> On Mon, Jul 20, 2015 at 03:57:37AM -0700, tip-bot for Davidlohr Bueso wrote:
> > Commit-ID: 767f509ca11269c2bcd92e3972a93096f2173ac0
> > Gitweb: http://git.kernel.org/tip/767f509ca11269c2bcd92e3972a93096f2173ac0
> > Author: Davidlohr Bueso <dave@stgolabs.net>
> > AuthorDate: Mon, 29 Jun 2015 23:26:01 -0700
> > Committer: Thomas Gleixner <tglx@linutronix.de>
> > CommitDate: Mon, 20 Jul 2015 11:45:45 +0200
> >
> > futex: Enhance comments in futex_lock_pi() for blocking paths
> >
> > ... serves a bit better to clarify between blocking
> > and non-blocking code paths.
> >
> > Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
> > Cc: Peter Zijlstra <peterz@infradead.org>
> > Cc: Darren Hart <darren@dvhart.com>
> > Cc: Davidlohr Bueso <dave@stgolabs.net>
> > Link: http://lkml.kernel.org/r/1435645562-975-2-git-send-email-dave@stgolabs.net
> > Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> > ---
> > kernel/futex.c | 11 +++++++++--
> > 1 file changed, 9 insertions(+), 2 deletions(-)
> >
> > diff --git a/kernel/futex.c b/kernel/futex.c
> > index c4a182f..153eb22 100644
> > --- a/kernel/futex.c
> > +++ b/kernel/futex.c
> > @@ -2268,8 +2268,11 @@ static long futex_wait_restart(struct restart_block *restart)
> > /*
> > * Userspace tried a 0 -> TID atomic transition of the futex value
> > * and failed. The kernel side here does the whole locking operation:
> > - * if there are waiters then it will block, it does PI, etc. (Due to
> > - * races the kernel might see a 0 value of the futex too.)
> > + * if there are waiters then it will block as a consequence of relying
> > + * on rt-mutexes, it does PI, etc. (Due to races the kernel might see
> > + * a 0 value of the futex too.).
> > + *
> > + * Also serves as futex trylock_pi()'ing, and due semantics.
>
> Hrm, what does 'due' mean here?

By that I meant respective/corresponding.




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