linux-kernel - Re: [PATCH] x86, setup: Check early serial console per string instead of one char

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Date:	Mon, 11 Oct 2010 11:19:24 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Yinghai Lu <yinghai@...nel.org>
CC:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86, setup: Check early serial console per string instead
 of one char

On 10/11/2010 10:50 AM, Yinghai Lu wrote:
> 
> Move out serial_putchar() calling out of putchar
> Let puts() to call serial_putchar() directly.
> 
> So only need to check early_serial_base per string.
> 
> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> 

This seems to add a bunch of code for zero benefit.  Testing a global
variable is zero cost compared to either a BIOS call or poking a serial
port.

	-hpa
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