linux-kernel - Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch doesn't support it

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:	Wed, 6 Dec 2006 11:05:22 -0800 (PST)
From:	Linus Torvalds <torvalds@...l.org>
To:	Christoph Lameter <clameter@....com>,
	Russell King <rmk+lkml@....linux.org.uk>
cc:	David Howells <dhowells@...hat.com>, Andrew Morton <akpm@...l.org>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	linux-arch@...r.kernel.org
Subject: Re: [PATCH] WorkStruct: Implement generic UP cmpxchg() where an arch
 doesn't support it



On Wed, 6 Dec 2006, Christoph Lameter wrote:
>
> I'd really appreciate a cmpxchg that is generically available for 
> all arches. It will allow lockless implementation for various performance 
> criticial portions of the kernel.

I suspect ARM may have been the last one without one, no?

That said, cmpxchg won't necessarily be "high-performance" unless the hw 
supports it naturally in hardware, so..

Russell, are you ok with the code DavidH posted (the "try 2" one)? I'd 
like to get an ack from the ARM maintainer before applying it, but it 
looked ok.

		Linus
-
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/