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

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Message-Id: <20090306113054.4ae4b875.akpm@linux-foundation.org>
Date:	Fri, 6 Mar 2009 11:30:54 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	yinghai@...nel.org, tglx@...utronix.de, hpa@...or.com,
	penberg@...helsinki.fi, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] x86: introduce bootmem_state -v2

On Fri, 6 Mar 2009 20:12:49 +0100
Ingo Molnar <mingo@...e.hu> 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.
> 
> Andrew, what would be your preference?
> 

If two architectures are using it then it should be provided by core
kernel?

This is obvious if the state transitions are occurring in core-kernel
code, but if the transitions are happening in arch code then making it
a core concept assumes consistency between different architectures
which might not exist.

IOW: dunno.
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