linux-kernel - Re: [PATCH 06/14] Pramfs: Include files

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:	Mon, 22 Jun 2009 23:20:39 +0100
From:	David Woodhouse <dwmw2@...radead.org>
To:	Jörn Engel <joern@...fs.org>
Cc:	Chris Simmonds <chris@...t.co.uk>, Arnd Bergmann <arnd@...db.de>,
	Marco <marco.stornelli@...il.com>,
	Sam Ravnborg <sam@...nborg.org>,
	Linux FS Devel <linux-fsdevel@...r.kernel.org>,
	Linux Embedded <linux-embedded@...r.kernel.org>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 06/14] Pramfs: Include files

On Mon, 2009-06-22 at 23:41 +0200, Jörn Engel wrote:
> Four loops doing the same increment with different data types: long,
> u64, we32 (wrong-endian) and we64.  Compile with _no_ optimizations.

That's a bit of a poor test then. Especially on architectures with a
load-and-swap instruction where it really shouldn't be any slower at
all.

(Although since GCC doesn't have an __attribute__((littleendian)) I'm
not entirely sure how to entice it into _using_ said instruction for the
purpose of the test... I think the kernel does manage somehow though, if
you get the sources _just_ right.)

-- 
David Woodhouse                            Open Source Technology Centre
David.Woodhouse@...el.com                              Intel Corporation

--
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/