linux-kernel - Re: [Patch 003/005](memory hotplug) make alloc_bootmem

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Date:	Mon, 16 Jun 2008 22:18:40 +0900
From:	Yasunori Goto <y-goto@...fujitsu.com>
To:	Andy Whitcroft <apw@...dowen.org>
Cc:	Badari Pulavarty <pbadari@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel ML <linux-kernel@...r.kernel.org>,
	linux-mm <linux-mm@...ck.org>, Yinghai Lu <yhlu.kernel@...il.com>
Subject: Re: [Patch 003/005](memory hotplug) make alloc_bootmem_section()

> On Mon, Apr 07, 2008 at 09:47:29PM +0900, Yasunori Goto wrote:
> > alloc_bootmem_section() can allocate specified section's area.
> > This is used for usemap to keep same section with pgdat by later patch.
> > 
> > Signed-off-by: Yasunori Goto <y-goto@...fujitsu.com>
> > 
> > ---
> >  include/linux/bootmem.h |    2 ++
> >  mm/bootmem.c            |   31 +++++++++++++++++++++++++++++++
> >  2 files changed, 33 insertions(+)
> > 
> > Index: current/include/linux/bootmem.h
> > ===================================================================
> > --- current.orig/include/linux/bootmem.h	2008-04-07 19:18:44.000000000 +0900
> > +++ current/include/linux/bootmem.h	2008-04-07 19:30:08.000000000 +0900
> > @@ -101,6 +101,8 @@
> >  extern void free_bootmem_node(pg_data_t *pgdat,
> >  			      unsigned long addr,
> >  			      unsigned long size);
> > +extern void *alloc_bootmem_section(unsigned long size,
> > +				   unsigned long section_nr);
> >  
> >  #ifndef CONFIG_HAVE_ARCH_BOOTMEM_NODE
> >  #define alloc_bootmem_node(pgdat, x) \
> > Index: current/mm/bootmem.c
> > ===================================================================
> > --- current.orig/mm/bootmem.c	2008-04-07 19:18:44.000000000 +0900
> > +++ current/mm/bootmem.c	2008-04-07 19:30:08.000000000 +0900
> > @@ -540,6 +540,37 @@
> >  	return __alloc_bootmem(size, align, goal);
> >  }
> >  
> > +#ifdef CONFIG_SPARSEMEM
> > +void * __init alloc_bootmem_section(unsigned long size,
> > +				    unsigned long section_nr)
> > +{
> > +	void *ptr;
> > +	unsigned long limit, goal, start_nr, end_nr, pfn;
> > +	struct pglist_data *pgdat;
> > +
> > +	pfn = section_nr_to_pfn(section_nr);
> > +	goal = PFN_PHYS(pfn);
> > +	limit = PFN_PHYS(section_nr_to_pfn(section_nr + 1)) - 1;
> > +	pgdat = NODE_DATA(early_pfn_to_nid(pfn));
> > +	ptr = __alloc_bootmem_core(pgdat->bdata, size, SMP_CACHE_BYTES, goal,
> > +				   limit);
> > +
> > +	if (!ptr)
> > +		return NULL;
> > +
> This also indicates a failure allocating within the section, and yet we
> do not report it here.
> 
> > +	start_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr)));
> > +	end_nr = pfn_to_section_nr(PFN_DOWN(__pa(ptr) + size));
> > +	if (start_nr != section_nr || end_nr != section_nr) {
> > +		printk(KERN_WARNING "alloc_bootmem failed on section %ld.\n",
> > +		       section_nr);
> > +		free_bootmem_core(pgdat->bdata, __pa(ptr), size);
> 
> But we do here.  I think we should report both if this is worth
> reporting.

Here is already removed from newest -mm.
(Bootmem code is rewritten by Johannes Weiner recently.)
Please check the newest -mm code.

-- 
Yasunori Goto 


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