linux-kernel - Re: [PATCH] x86: introduce bootmem

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Message-ID: <20090306213523.GB3306@elte.hu>
Date:	Fri, 6 Mar 2009 22:35:23 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: introduce bootmem_state -v2


* Yinghai Lu <yinghai@...nel.org> wrote:

> Ingo Molnar wrote:
> > * Yinghai Lu <yinghai@...nel.org> wrote:
> > 
> >> Ingo Molnar wrote:
> >>> * Yinghai Lu <yinghai@...nel.org> wrote:
> >>>
> >>>> Impact: cleanup
> >>>>
> >>>> extend after_bootmem and after_init_bootmem to bootmem_state
> >>>> and will have BEFORE_BOOTMEM, DURING_BOOTMEM, AFTER_BOOTMEM
> >>>>
> >>>> v2: style changes according to ingo
> >>>>
> >>>> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> >>>>
> >>>> ---
> >>>>  arch/x86/kernel/setup.c |    1 +
> >>>>  arch/x86/mm/init.c      |   13 +++++++------
> >>>>  arch/x86/mm/init_32.c   |   28 ++++++++++++++++++++--------
> >>>>  arch/x86/mm/init_64.c   |   33 +++++++++++++++++++--------------
> >>>>  include/linux/mm.h      |    9 +++++++++
> >>>>  5 files changed, 56 insertions(+), 28 deletions(-)
> >>>> Index: linux-2.6/include/linux/mm.h
> >>>> ===================================================================
> >>>> --- linux-2.6.orig/include/linux/mm.h
> >>>> +++ linux-2.6/include/linux/mm.h
> >>>> @@ -1067,6 +1067,15 @@ extern void __init mmap_init(void);
> >>>>  extern void show_mem(void);
> >>>>  extern void si_meminfo(struct sysinfo * val);
> >>>>  extern void si_meminfo_node(struct sysinfo *val, int nid);
> >>>> +
> >>>> +enum bootmem_state {
> >>>> +	BEFORE_BOOTMEM,
> >>>> +	DURING_BOOTMEM,
> >>>> +	AFTER_BOOTMEM
> >>>> +};
> >>>> +
> >>>> +extern enum bootmem_state bootmem_state;
> >>>> +
> >>>>  extern int after_bootmem;
> >>> Btw., the after_bootmem variable itself should either move 
> >>> to x86 (and arch/sh), or should be defined in mm/bootmem.c.
> >>>
> >>> Right now we have this weird mm.h construct that is not 
> >>> actually useful to generic code.
> >> with this patch, only sh is using after_bootmem. could
> >> 1. make sh to use bootmem_state
> >> 2. then remove after_bootmem
> > 
> > Hm, lets leave arch/sh alone for now i think - the commits are 
> > desintd for the x86 tree.
> > 
> > But we should move our after_bootmem to arch/x86/include/ and 
> > not pollute mm.h with it. It's an x86 internal detail for now.
> > 
> 
> you mean move bootmem_state to arch/x86/include ?
> with this patch are not using after_bootmem anymore.

Correct. So basically we change x86 to use bootmem_state only, 
and leave mm.h alone. arch/sh can still use after_bootmem. 
(which it should likely move to its own header files - but 
that's for a different patch)

	Ingo
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