linux-kernel - Re: mmotm 2009-09-09-22-56 uploaded

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Date:	Tue, 29 Sep 2009 15:32:42 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Suresh Jayaraman <sjayaraman@...e.de>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: mmotm 2009-09-09-22-56 uploaded

On Mon, 28 Sep 2009 23:27:48 -0700
Andrew Morton <akpm@...ux-foundation.org> wrote:

> On Tue, 29 Sep 2009 11:49:39 +0530 Suresh Jayaraman <sjayaraman@...e.de> wrote:
> 
> > Hi all,
> > 
> > On Thu, Sep 10, 2009 at 11:31 AM,  <akpm@...ux-foundation.org> wrote:
> > > The mm-of-the-moment snapshot 2009-09-09-22-56 has been uploaded to
> > >
> > >   http://userweb.kernel.org/~akpm/mmotm/
> > >
> > > and will soon be available at
> > >
> > >   git://git.zen-sources.org/zen/mmotm.git
> > >
> > 
> > With this snapshot plus fixes, I'm unable to limit the memory using the
> > kernel command line switch "mem=nn" on a x86_64 box. Is this the
> > expected behavior?
> > 
> > Using "cgroup_disable=memory" together with "mem=nn" switch didn't help.
> > Am I supposed to use some other switch along with this?
> > 
> 
> hm, perhaps that -mm was needing this?
> 
It seems this revert has been in -mm already.

Regards,
-Kame


> 
> commit eda6da9286ad5b35b1eb70f6368958a8ee41a9dd
> Author:     Yinghai Lu <yinghai@...nel.org>
> AuthorDate: Sat Sep 19 11:07:57 2009 -0700
> Commit:     Ingo Molnar <mingo@...e.hu>
> CommitDate: Sat Sep 19 20:31:33 2009 +0200
> 
>     Revert 'x86: Fix system crash when loading with "reservetop" parameter'
>     
>     After close looking, commit 8126dec3 will break:
>     
>      1. some cpu feature  in early stage too, like cpu_has_x2apic
>      2. will break built-in-command line
>      3. will break other memmap= and mem=
>      4. early_dbgp and early_console that will use early_ioremap to access mmio (?)
>     
>     So revert it.
>     
>     Reported-by: Hugh Dickins <hugh.dickins@...cali.co.uk>,
>     Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
>     Cc: Andrew Morton <akpm@...ux-foundation.org>,
>     LKML-Reference: <4AB51DFD.2000904@...nel.org>
>     Signed-off-by: Ingo Molnar <mingo@...e.hu>
> 
> diff --git a/arch/x86/kernel/setup.c b/arch/x86/kernel/setup.c
> index 19f15c4..f5baa2a 100644
> --- a/arch/x86/kernel/setup.c
> +++ b/arch/x86/kernel/setup.c
> @@ -712,21 +712,6 @@ void __init setup_arch(char **cmdline_p)
>  	printk(KERN_INFO "Command line: %s\n", boot_command_line);
>  #endif
>  
> -	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
> -	*cmdline_p = command_line;
> -
> -#ifdef CONFIG_X86_64
> -	/*
> -	 * Must call this twice: Once just to detect whether hardware doesn't
> -	 * support NX (so that the early EHCI debug console setup can safely
> -	 * call set_fixmap(), and then again after parsing early parameters to
> -	 * honor the respective command line option.
> -	 */
> -	check_efer();
> -#endif
> -
> -	parse_early_param();
> -
>  	/* VMI may relocate the fixmap; do this before touching ioremap area */
>  	vmi_init();
>  
> @@ -809,6 +794,21 @@ void __init setup_arch(char **cmdline_p)
>  #endif
>  #endif
>  
> +	strlcpy(command_line, boot_command_line, COMMAND_LINE_SIZE);
> +	*cmdline_p = command_line;
> +
> +#ifdef CONFIG_X86_64
> +	/*
> +	 * Must call this twice: Once just to detect whether hardware doesn't
> +	 * support NX (so that the early EHCI debug console setup can safely
> +	 * call set_fixmap(), and then again after parsing early parameters to
> +	 * honor the respective command line option.
> +	 */
> +	check_efer();
> +#endif
> +
> +	parse_early_param();
> +
>  #ifdef CONFIG_X86_64
>  	check_efer();
>  #endif
> 

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