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  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:	Sat, 3 Mar 2007 08:19:33 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Nicholas Miell <nmiell@...cast.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Arjan van de Ven <arjan@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [patch 00/13] Syslets, "Threadlets", generic AIO support, v3


* Davide Libenzi <davidel@...ilserver.org> wrote:

> [...] Status word and control bits should not be changed from 
> underneath userspace AFAIK. [...]

Note that the control bits do not just magically change during normal 
FPU use. It's a bit like sys_setsid()/iopl/etc., it makes little sense 
to change those per-thread anyway. This is a non-issue anyway - what is 
important is that the big bulk of 512 (or more) bytes of FPU state /are/ 
callee-saved (both on 32-bit and on 64-bit), hence there's no need to 
unlazy anything or to do expensive FPU state saves or other FPU juggling 
around threadlet (or even syslet) use.

	Ingo
-
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/

Powered by blists - more mailing lists