From: "H. Peter Anvin" <hpa@zytor.com>
To: Jan Beulich <JBeulich@novell.com>
Cc: Ingo Molnar <mingo@elte.hu>, Thomas Gleixner <tglx@linutronix.de>,
Nick Piggin <npiggin@suse.de>,
linux-kernel@vger.kernel.org
Subject: Re: uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG_M386
Date: Tue, 12 May 2009 08:51:12 -0700 [thread overview]
Message-ID: <4A099AF0.8020001@zytor.com> (raw)
In-Reply-To: <4A09AF8402000078000007DC@vpn.id2.novell.com>
Jan Beulich wrote:
> While looking at a completely different issue I happened to grep for uses of
> xadd, and it would appear to me that there got uses added that would make
> a M386-configured SMP kernel die on an actual i386.
>
> Oh, for the rwsem case I see - it would use the RWSEM_GENERIC_SPINLOCK case
> when selecting M386. But I see nothing similar for the ticket spinlocks - am
> I overlooking something?
It's quite possible we break 386 on a regular basis... I'm not sure how
many people even in the embedded industry run current kernels on
386-compatible hardware. Most embedded hardware is at least 486.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
next prev parent reply other threads:[~2009-05-12 15:51 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-05-12 15:19 uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG_M386 Jan Beulich
2009-05-12 15:37 ` Nick Piggin
2009-05-12 15:57 ` Alan Cox
2009-05-12 16:02 ` Peter Zijlstra
2009-05-12 15:51 ` H. Peter Anvin [this message]
2009-05-12 15:57 ` Nick Piggin
2009-05-12 16:04 ` H. Peter Anvin
2009-05-12 16:16 ` Jan Beulich
2009-05-12 16:18 ` Andreas Schwab
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=4A099AF0.8020001@zytor.com \
--to=hpa@zytor.com \
--cc=JBeulich@novell.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@elte.hu \
--cc=npiggin@suse.de \
--cc=tglx@linutronix.de \
/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.