linux-kernel - Re: [PATCH] kernel/printk: do not turn off bootconsole in printk_late_init if keep

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Date:	Mon, 15 Aug 2011 14:03:56 +0200
From:	"Fabio M. Di Nitto" <fabbione@...bione.net>
To:	Nishanth Aravamudan <nacc@...ibm.com>
CC:	linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Alan Cox <alan@...rguk.ukuu.org.uk>, Greg KH <gregkh@...e.de>
Subject: Re: [PATCH] kernel/printk: do not turn off bootconsole in printk_late_init
 if keep_bootcon

On 8/10/2011 2:02 AM, Nishanth Aravamudan wrote:
> It seems that commit 7bf693951a8e5f7e600a45b74d91d962a453146e doesn't
> always achieve what it aims, as printk_late_init() runs it
> unconditionally turns off all boot consoles. With this patch, I am able
> to see more messages on the boot console in KVM guests than I can
> without, when keep_bootcon is specified.
> 
> Signed-off-by: Nishanth Aravamudan <nacc@...ibm.com>
> Cc: David S. Miller <davem@...emloft.net>
> Cc: Alan Cox <alan@...rguk.ukuu.org.uk>
> Cc: Greg KH <gregkh@...e.de>
> ---
>  kernel/printk.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/printk.c b/kernel/printk.c
> index 37dff34..293a6cc 100644
> --- a/kernel/printk.c
> +++ b/kernel/printk.c
> @@ -1602,7 +1602,7 @@ static int __init printk_late_init(void)
>  	struct console *con;
>  
>  	for_each_console(con) {
> -		if (con->flags & CON_BOOT) {
> +		if (!keep_bootcon && con->flags & CON_BOOT) {
>  			printk(KERN_INFO "turn off boot console %s%d\n",
>  				con->name, con->index);
>  			unregister_console(con);

Patch looks ok to me, just send it through the right channels for inclusion.

Fabio
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