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  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]
Date:	Fri, 21 Mar 2014 02:45:47 +0000
From:	"Dilger, Andreas" <>
To:	Oleg Nesterov <>,
	Peter Zijlstra <>
CC:	Peng Tao <>,
	Linux Kernel Mailing List <>,
	Ingo Molnar <>,
	"Drokin, Oleg" <>
Subject: Re: [PATCH 0/2] wait: introduce WQ_FLAG_EXCLUSIVE_HEAD

On 2014/03/20, 11:51 AM, "Oleg Nesterov" <> wrote:

>On 03/19, Oleg Nesterov wrote:
>> OK, I'll try to test/cleanup/resend tomorrow.
>Cough. Still un-tested, sorry. I will test it somehow and report,
>but I'd like to send this for review right now.
>Because I simply can't decide what the new flag should actually
>do, so please ack/nack the semantics/naming at least.
>	1. I decided it would be better to change __wait_event()
>	   to accept wait.flags right now. This looks better in
>	   any case to me, and otherwise we need to introduce the
>	   __wait_exclusive_enum.
>	   The change looks trivial (both actually), please tell
>	   me if you think it doesn't deserve a separate patch.
>	2. I won't insist, but WQ_FLAG_EXCLUSIVE_HEAD can be used
>	   without WQ_FLAG_EXCLUSIVE.
>	   Unlikely this can be useful, but it looks more natural
>	   this way. Otherwise we need to add another check to
>	   ensure that WQ_FLAG_EXCLUSIVE_HEAD can't come alone.
>	   However, perhaps this means the new flag needs another
>	   name. I agree in advance with any.

What about:

#define WQ_FLAG_HEAD	0x02


That avoids having WQ_FLAG_EXCLUSIVE_HEAD not actually meaning "exclusive"?

Patches look reasonable at first glance.  The second patch would need
to be changed to handle that WQ_FLAG_EXCLUSIVE_HEAD has both bits set
(probably just replace uses of WQ_FLAG_EXCLUSIVE_HEAD with WQ_FLAG_HEAD).

Cheers, Andreas
Andreas Dilger

Lustre Software Architect
Intel High Performance Data Division

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

Powered by blists - more mailing lists