linux-kernel - Re: [RFC Patch 6/9] Use virtual debug registers in process/thread handling code

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: <20081204122349.GB5207@in.ibm.com>
Date:	Thu, 4 Dec 2008 17:53:49 +0530
From:	"K.Prasad" <prasad@...ux.vnet.ibm.com>
To:	Roland McGrath <roland@...hat.com>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	akpm@...ux-foundation.org, mingo@...e.hu,
	jason.wessel@...driver.com, avi@...ranet.com,
	richardj_moore@...ibm.com
Subject: Re: [RFC Patch 6/9] Use virtual debug registers in process/thread
	handling code

On Wed, Dec 03, 2008 at 05:05:59PM -0800, Roland McGrath wrote:
> > > Hmm.  The 64-bit version of __switch_to does the current change much
> > > earlier, before __switch_to_xtra and math_state_restore.  I wonder if the
> > > 32-bit version could change to match.  I can't see what in __switch_to_xtra
> > > would care either way, though I may be overlooking something.  Ingo?
> > 
> > Would it be better to move __switch_to_xtra down below the change to 
> > current, rather than moving the change to current up above 
> > __switch_to_xtra?
> 
> I can't see that anything else in __switch_to_xtra cares either way.
> 
> 
> Thanks,
> Roland
>

That the grouse against the placement of
switch_to_thread_hw_breakpoint() is about additional code in the
hot-path, can we deal with this separately through a different patch?

I now have the patchset which provides only data breakpoint facility on
x86 (and x86_64) and has addressed your comments, ported against
2.6.28-rc7 which will be sent shortly. I'm thinking if the suggested
changes to the context-switching code can be handled later.

Thanks,
K.Prasad

--
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/