From: Cyrill Gorcunov <gorcunov@gmail.com>
To: "H. Peter Anvin" <hpa@zytor.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Ingo Molnar <mingo@redhat.com>, Yinghai Lu <yinghai@kernel.org>
Subject: Re: [PATCH v2] x86: Early-boot serial I/O support
Date: Sun, 11 Jul 2010 01:55:54 +0400 [thread overview]
Message-ID: <20100710215554.GE6615@lenovo> (raw)
In-Reply-To: <4C38E7FD.9020403@zytor.com>
On Sat, Jul 10, 2010 at 02:37:01PM -0700, H. Peter Anvin wrote:
> On 07/10/2010 02:07 PM, Cyrill Gorcunov wrote:
> > On Sat, Jul 10, 2010 at 10:40:20PM +0300, Pekka Enberg wrote:
> >> This patch adds serial I/O support to very early boot printf(). It's useful for
> >> debugging boot code when running Linux under KVM, for example. The actual code
> >>
> >> +#define cpu_relax() asm volatile("rep; nop" ::: "memory")
> >> +
>
> We don't need "memory" here since the early boot environment is
> single-threaded.
>
> -hpa
>
I rather wonder -- can't we use cpu_relax() from processor.h? Or there
is some type conflicts?
-- Cyrill
next prev parent reply other threads:[~2010-07-10 21:56 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-10 19:40 [PATCH v2] x86: Early-boot serial I/O support Pekka Enberg
2010-07-10 20:49 ` Yinghai Lu
2010-07-10 21:17 ` Pekka Enberg
2010-07-10 21:27 ` H. Peter Anvin
2010-07-10 21:32 ` Pekka Enberg
2010-07-10 21:07 ` Cyrill Gorcunov
2010-07-10 21:18 ` Pekka Enberg
2010-07-10 21:32 ` Cyrill Gorcunov
2010-07-10 21:36 ` H. Peter Anvin
2010-07-10 21:37 ` H. Peter Anvin
2010-07-10 21:55 ` Cyrill Gorcunov [this message]
2010-07-10 22:30 ` H. Peter Anvin
2010-07-11 7:10 ` Pekka Enberg
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