From: Pavel Machek <pavel@suse.cz>
To: Michael Chen <michaelc@turbolinux.com.cn>,
alan@lxorguk.ukuu.org.uk, torvalds@transmeta.com
Cc: linux-kernel@vger.kernel.org
Subject: Re: About Celeron processor memory barrier problem
Date: Sat, 23 Dec 2000 23:34:48 +0100 [thread overview]
Message-ID: <20001223233448.F541@bug.ucw.cz> (raw)
In-Reply-To: <4015029078.19991223172443@turbolinux.com.cn>
In-Reply-To: <4015029078.19991223172443@turbolinux.com.cn>; from michael chen on Thu, Dec 23, 1999 at 05:24:43PM +0800
Hi!
> diff -Nur linux/include/asm-i386/system.h linux.new/include/asm-i386/system.h
> --- linux/include/asm-i386/system.h Mon Dec 11 19:26:39 2000
> +++ linux.new/include/asm-i386/system.h Sat Dec 23 16:06:01 2000
> @@ -274,7 +274,14 @@
> #ifndef CONFIG_X86_XMM
> #define mb() __asm__ __volatile__ ("lock; addl $0,0(%%esp)": : :"memory")
> #else
> -#define mb() __asm__ __volatile__ ("sfence": : :"memory")
> +#define mb() do { \
> + if ( cpu_has_xmm ) { \
~~~~~~~~~~~~~~~~~~
Cost of test may well be bigger than gain by using sfence...
Pavel
--
I'm pavel@ucw.cz. "In my country we have almost anarchy and I don't care."
Panos Katsaloulis describing me w.r.t. patents at discuss@linmodems.org
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/
next prev parent reply other threads:[~2000-12-24 17:18 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-12-23 9:24 About Celeron processor memory barrier problem michael chen
2000-12-23 11:04 ` Erik Mouw
2000-12-23 17:21 ` Linus Torvalds
2000-12-23 23:27 ` Erik Mouw
2000-12-24 9:45 ` Jeffrey Rose
2000-12-24 11:48 ` Erik Mouw
2000-12-23 23:36 ` Matthias Schniedermeyer
2000-12-24 9:36 ` Kai Henningsen
2000-12-24 20:50 ` Tim Wright
2000-12-24 22:25 ` Linus Torvalds
2000-12-25 2:38 ` Tim Wright
2000-12-25 7:19 ` The Doctor What
2000-12-26 1:40 ` Alan Cox
2000-12-26 18:14 ` Linus Torvalds
2000-12-26 22:31 ` Rogier Wolff
2001-01-01 11:55 ` Riley Williams
2000-12-25 11:12 ` Kai Henningsen
2000-12-25 19:37 ` Ian Stirling
2000-12-26 20:38 ` Pavel Machek
2000-12-26 0:15 ` Albert D. Cahalan
2000-12-23 22:34 ` Pavel Machek [this message]
[not found] <fa.gm0b5nv.1h2mope@ifi.uio.no>
[not found] ` <fa.n7l96dv.2nah0l@ifi.uio.no>
2000-12-26 19:24 ` Giacomo Catenazzi
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20001223233448.F541@bug.ucw.cz \
--to=pavel@suse.cz \
--cc=alan@lxorguk.ukuu.org.uk \
--cc=linux-kernel@vger.kernel.org \
--cc=michaelc@turbolinux.com.cn \
--cc=torvalds@transmeta.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.