linux-kernel - Re: Regression in serial console on ia64 after 2.6.22

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Date:	Wed, 25 Jul 2007 16:17:19 +0900
From:	Horms <horms@...ge.net.au>
To:	Yinghai Lu <Yinghai.Lu@....COM>
Cc:	linux-ia64 <linux-ia64@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>, Andi Kleen <ak@...e.de>,
	Bjorn Helgaas <bjorn.helgaas@...com>,
	Russell King <rmk@....linux.org.uk>,
	Gerd Hoffmann <kraxel@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Michal Piotrowski <michal.k.k.piotrowski@...il.com>
Subject: Re: Regression in serial console on ia64 after 2.6.22

On Tue, Jul 24, 2007 at 04:57:32PM -0700, Yinghai Lu wrote:
> 
> IA64
> 
> Subject         : Regression in serial console on ia64 after 2.6.22
> References      : http://marc.info/?l=linux-ia64&m=118483645914066&w=2
> Last known good : ?
> Submitter       : Horms <horms@...ge.net.au>
> Caused-By       : Yinghai Lu <Yinghai.Lu@....COM>
>                   commit 18a8bd949d6adb311ea816125ff65050df1f3f6e
> Handled-By      : ?
> Status          : unknown
> 
> 
> please test this patch.
> 
> YH

I just posted a similar patch (sorry, I didn't see your post until
afterwards). I guess that we both have the same ideas :)

> 
> 
> [PATCH] ia64: move machvec_init before parse_early_param
> 
> So ia64_mv is initialized before early console
> 
> Signed-off-by: Yinghai Lu <yinghai.lu@....com>
> 
> diff --git a/arch/ia64/kernel/machvec.c b/arch/ia64/kernel/machvec.c
> index 13df337..a94feaa 100644
> --- a/arch/ia64/kernel/machvec.c
> +++ b/arch/ia64/kernel/machvec.c
> @@ -14,12 +14,6 @@ struct ia64_machine_vector ia64_mv;
>  EXPORT_SYMBOL(ia64_mv);
>  
>  static __initdata const char *mvec_name;
> -static __init int setup_mvec(char *s)
> -{
> -	mvec_name = s;
> -	return 0;
> -}
> -early_param("machvec", setup_mvec);
>  
>  static struct ia64_machine_vector * __init
>  lookup_machvec (const char *name)
> @@ -42,6 +36,10 @@ machvec_init (const char *name)
>  
>  	if (!name)
>  		name = mvec_name ? mvec_name : acpi_get_sysname();

I think that mvec_name can be disposed of all together as
its only used by the line above and setup_mvec(), which in
turn is only used by early_param. I got rid of mvec_name in
my incantation of this patch, and it seemed to work quite well.

> +
> +	if (!mvec_name)
> +		mvec_name = name;
> +
>  	mv = lookup_machvec(name);
>  	if (!mv)
>  		panic("generic kernel failed to find machine vector for"
> diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
> index cf06fe7..b06d7b7 100644
> --- a/arch/ia64/kernel/setup.c
> +++ b/arch/ia64/kernel/setup.c
> @@ -481,6 +481,9 @@ int __init reserve_elfcorehdr(unsigned long *start, unsigned long *end)
>  void __init
>  setup_arch (char **cmdline_p)
>  {
> +#ifdef CONFIG_IA64_GENERIC
> +	char *mvstr;
> +#endif
>  	unw_init();
>  
>  	ia64_patch_vtop((u64) __start___vtop_patchlist, (u64) __end___vtop_patchlist);
> @@ -491,12 +494,15 @@ setup_arch (char **cmdline_p)
>  	efi_init();
>  	io_port_init();
>  
> -	parse_early_param();
> -
>  #ifdef CONFIG_IA64_GENERIC
> -	machvec_init(NULL);
> +	mvstr = strstr(*cmd_line_p, "machvec=")
> +	if (mvstr)
> +		mvstr = strchr(mvstr, '=') + 1;
> +	machvec_init(mvstr);
>  #endif

Do you need to copy and truncate mvstr on ' ' in the case
that machvec= isn't the last argument on the command line?
I did this in my patch, though I didn't test to see if
it was uneccessary.


>  
> +	parse_early_param();
> +
>  	if (early_console_setup(*cmdline_p) == 0)
>  		mark_bsp_online();
>  
> 
> 
> -
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-- 
Horms
  H: http://www.vergenet.net/~horms/
  W: http://www.valinux.co.jp/en/

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