linux-kernel - Re: [PATCH v4 3/4] futex: Document ordering guarantees

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1387486823.5494.5.camel@buesod1.americas.hpqcorp.net>
Date:	Thu, 19 Dec 2013 13:00:23 -0800
From:	Davidlohr Bueso <davidlohr@...com>
To:	Randy Dunlap <rdunlap@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com,
	dvhart@...ux.intel.com, peterz@...radead.org, tglx@...utronix.de,
	paulmck@...ux.vnet.ibm.com, efault@....de, jeffm@...e.com,
	torvalds@...ux-foundation.org, jason.low2@...com,
	Waiman.Long@...com, tom.vaden@...com, scott.norton@...com,
	aswin@...com, Ingo Molnar <mingo@...nel.org>
Subject: Re: [PATCH v4 3/4] futex: Document ordering guarantees

On Thu, 2013-12-19 at 12:51 -0800, Randy Dunlap wrote:
> On 12/19/13 12:45, Davidlohr Bueso wrote:
> > From: Thomas Gleixner <tglx@...utronix.de>
> > 
> > That's essential, if you want to hack on futexes.
> > 
> > Cc: Ingo Molnar <mingo@...nel.org>
> > Cc: Darren Hart <dvhart@...ux.intel.com>
> > Acked-by: Peter Zijlstra <peterz@...radead.org>
> > Cc: Thomas Gleixner <tglx@...utronix.de>
> > Cc: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Cc: Mike Galbraith <efault@....de>
> > Cc: Jeff Mahoney <jeffm@...e.com>
> > Cc: Linus Torvalds <torvalds@...ux-foundation.org>
> > Cc: Scott Norton <scott.norton@...com>
> > Cc: Tom Vaden <tom.vaden@...com>
> > Cc: Aswin Chandramouleeswaran <aswin@...com>
> > Cc: Waiman Long <Waiman.Long@...com>
> > Cc: Jason Low <jason.low2@...com>
> > Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> > Signed-off-by: Davidlohr Bueso <davidlohr@...com>
> > ---
> >  kernel/futex.c | 57 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
> >  1 file changed, 57 insertions(+)
> > 
> > diff --git a/kernel/futex.c b/kernel/futex.c
> > index 577481d..af1fc31 100644
> > --- a/kernel/futex.c
> > +++ b/kernel/futex.c
> > @@ -69,6 +69,63 @@
> >  
> >  #include "locking/rtmutex_common.h"
> >  
> > +/*
> > + * Basic futex operation and ordering guarantees:
> > + *
> > + * The waiter reads the futex value in user space and calls
> > + * futex_wait(). It computes the hash bucket and acquires the hash
> 
> does                It
> refer to "the waiter" or to futex_wait()?
> I read it as referring to the waiter, but ISTM that the comments are using It
> to refer to futex_wait()... ???
> 

Yes, it refers to futex_wait(), which IMO in a futex context is pretty
clear.

Thanks,
Davidlohr

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/