linux-kernel - RE: [PATCH v3 2/2] powerpc: add support for csum

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] [day] [month] [year] [list]

Message-ID: <063D6719AE5E284EB5DD2968C1650D6D1CB40893@AcuExch.aculab.com>
Date:	Wed, 27 May 2015 08:41:01 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Scott Wood' <scottwood@...escale.com>
CC:	'Christophe Leroy' <christophe.leroy@....fr>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Paul Mackerras <paulus@...ba.org>,
	"Michael Ellerman" <mpe@...erman.id.au>,
	"linuxppc-dev@...ts.ozlabs.org" <linuxppc-dev@...ts.ozlabs.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH v3 2/2] powerpc: add support for csum_add()

From: Scott Wood
> Sent: 26 May 2015 20:43
...
> > I was thinking of all 64bit targets, not 32bit ones.
> 
> Oh, you mean move it out of arch/powerpc?  Sounds reasonable, but
> someone should probably check what the resulting code looks like on
> other common arches.  OTOH, if we're going to modify non-arch code,
> that might be a good opportunity to implement Segher's suggestion and
> move to a 64-bit accumulator.

Or more likely: adding alternate 32bit words to different 64-bit
registers in order to reduce the dependency chains further.
I'm sure I've seen a version that does that somewhere.

	David