linux-kernel - Re: [PATCH 06/13] async_tx: add support for asynchronous GF multiplication

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]

Date:	Fri, 20 Mar 2009 15:43:42 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Dan Williams <dan.j.williams@...el.com>
CC:	"H. Peter Anvin" <h.peter.anvin@...el.com>,
	linux-raid@...r.kernel.org, linux-kernel@...r.kernel.org,
	neilb@...e.de, maciej.sosnowski@...el.com,
	Ilya Yanok <yanok@...raft.com>, Yuri Tikhonov <yur@...raft.com>
Subject: Re: [PATCH 06/13] async_tx: add support for asynchronous GF 	multiplication

Dan Williams wrote:
> 
> Something is broken if we take this path.  This routine could stand to
> have a WARN_ONCE(), because if it is ever called there is something is
> wrong with the raid6 offload driver.  The intent is that the
> asynchronous recovery routines will perform an early check to see if
> the recovery can be offloaded (with a series of calls to
> async_xor/async_pq).  If not we fall back to the optimized synchronous
> recovery routines (raid6_2data_recov, raid6_datap_recov).  The only
> time this path will be taken is if we have decided to perform
> asynchronous recovery but at a later call to async_pq the offload
> driver reports it has run out of descriptors.
> 

That doesn't explain what you expect the code to do.  It still doesn't 
make sense to me.

	-hpa
--
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/