From: "H. Peter Anvin" <hpa@zytor.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Yinghai Lu <yhlu.kernel@gmail.com>,
mingo@elte.hu, tglx@linutronix.de, andi@firstfloor.org,
arjan@infradead.org, greg@kroah.com,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] x86: usb debug port early console
Date: Wed, 23 Jul 2008 23:13:01 -0400 [thread overview]
Message-ID: <4887F33D.6020803@zytor.com> (raw)
In-Reply-To: <m17ibcf0s8.fsf@frodo.ebiederm.org>
Eric W. Biederman wrote:
>
>>> +static void dbgp_breath(void)
>>> +{
>>> + /* Sleep to give the debug port a chance to breathe */
>>> +}
>> I expect the compiler will optimise away any calls to this.
>
> It is documentation that is if it might be a good idea to not hit the
> hardware there.
>
Sounds an awful lot like cpu_relax(); doesn't it?
-hpa
next prev parent reply other threads:[~2008-07-24 3:17 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-23 19:52 [PATCH] x86: usb debug port early console Yinghai Lu
2008-07-23 20:12 ` Andrew Morton
2008-07-23 20:18 ` Yinghai Lu
2008-07-23 20:36 ` Andrew Morton
2008-07-24 2:56 ` Eric W. Biederman
2008-07-24 3:13 ` H. Peter Anvin [this message]
2008-07-23 21:00 ` [PATCH] x86: usb debug port early console v2 Yinghai Lu
2008-07-23 22:45 ` Greg KH
2008-07-23 22:54 ` Yinghai Lu
2008-07-23 23:21 ` Greg KH
2008-07-23 23:46 ` Yinghai Lu
2008-07-24 0:06 ` Greg KH
2008-07-24 0:39 ` [PATCH] x86: usb debug port early console v3 Yinghai Lu
2008-07-24 11:14 ` Ingo Molnar
2008-07-25 0:27 ` [PATCH] usb: move ehci reg def Yinghai Lu
2008-07-25 0:57 ` David Brownell
2008-07-25 2:14 ` Yinghai Lu
2008-07-26 14:18 ` Ingo Molnar
2008-07-28 15:40 ` Greg KH
2008-07-28 16:11 ` Ingo Molnar
2008-07-28 16:47 ` Greg KH
2008-07-28 18:47 ` David Brownell
2008-07-25 0:29 ` [PATCH] x86: usb debug port early console v4 Yinghai Lu
2008-07-26 13:48 ` Ingo Molnar
2008-07-26 15:38 ` Ingo Molnar
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